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Class 10 Science Chapter 6 Control and Coordination — Formulas & Key Points

CBSE Class 10 Science Chapter 6 Control and Coordination does not contain mathematical formulas like Physics or Chemistry chapters, but it demands precise recall of definitions, biological pathways, hormone functions and gland locations. This formula sheet organises every NCERT term, reflex pathway, neuron structure component, plant hormone action and endocrine gland secretion into revision-friendly tables and lists, exactly as they appear in board mark schemes.

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Key takeaways

✓Control and Coordination is a theory-heavy chapter with no numerical formulas but many definitions, pathways and hormone tables that appear in 3-5 mark questions.
✓Reflex arc pathway (receptor → sensory neuron → spinal cord → motor neuron → effector) is a guaranteed 3-mark diagram question in CBSE board exams.
✓Five plant hormones (auxin, gibberellin, cytokinin, abscisic acid, ethylene) and their specific functions must be memorised with correct spellings.
✓Endocrine gland table (gland name, hormone secreted, function, deficiency disorder) is high-yield for 5-mark tabular questions.
✓Neuron structure labelling and synapse mechanism are frequent 2-mark diagram-based questions in CBSE Class 10 Science papers.
✓Difference-based questions (nervous vs hormonal coordination, receptor vs effector, reflex vs voluntary action) carry 3 marks and need tabular answers.
✓Tropic movements in plants (phototropism, geotropism, chemotropism, hydrotropism, thigmotropism) with examples are asked as 2-3 mark short answers every year.

Core Definitions and Biological Terms — Chapter 6

The CBSE Class 10 Science board paper consistently awards 1-2 marks for correctly defining terms from Control and Coordination. Examiners deduct marks for vague answers like saying 'hormones are chemical messengers' without specifying they are produced by endocrine glands and transported via blood. Similarly, defining 'reflex action' must include the keywords involuntary, automatic and spinal cord involvement. Students often confuse stimulus with response or receptor with effector, losing easy marks. The table below lists every definition exactly as NCERT presents it, using the same scientific terminology that CBSE mark schemes expect. Memorise the bold keywords in each definition, as examiners specifically look for them when awarding full marks in Class 10 Science solutions.

Control and Coordination: The ability of an organism to detect changes (stimuli) in the environment and respond appropriately to maintain life processes.
Stimulus: Any change in the environment (light, heat, sound, chemical, touch) that triggers a response in a living organism.
Response: The reaction of an organism to a stimulus, carried out by effector organs like muscles or glands.
Receptor: Specialised cells or organs that detect stimuli (e.g. eyes detect light, nose detects smell, skin detects touch and temperature).
Effector: Organs or cells that produce a response to a stimulus (muscles cause movement, glands secrete hormones).
Coordination: The working together of various organs in a systematic manner to produce a proper response to a stimulus.
Reflex Action: An involuntary, automatic and rapid response to a stimulus, coordinated by the spinal cord without involvement of the brain.
Reflex Arc: The pathway taken by nerve impulses in a reflex action (receptor → sensory neuron → spinal cord → motor neuron → effector).
Synapse: The microscopic gap between two neurons where electrical signals are converted to chemical signals (neurotransmitters) to transmit the impulse.
Hormone: Chemical messenger secreted in small amounts by endocrine glands directly into the bloodstream to regulate body functions at distant target organs.
Endocrine Gland: Ductless gland that secretes hormones directly into blood (e.g. pituitary, thyroid, pancreas, adrenal, testes, ovaries).
Tropism: Directional growth movement of a plant part in response to an external stimulus (light, gravity, water, chemicals, touch).
Phototropism: Growth movement of plant parts towards light (positive in shoots) or away from light (negative in roots).
Geotropism (Gravitropism): Growth movement in response to gravity (positive in roots downward, negative in shoots upward).
Chemotropism: Growth movement in response to chemicals (e.g. pollen tube growing towards ovule).
Hydrotropism: Growth movement of roots towards water.
Thigmotropism: Growth movement in response to touch or contact (e.g. tendrils coiling around support).
Nastic Movement: Non-directional movement of plant parts in response to stimulus, independent of stimulus direction (e.g. touch-me-not leaves folding).

Neuron Structure and Components — Diagram Key Points

The neuron diagram is a 2-mark sure-shot question in CBSE Class 10 Science board exams, appearing almost every year. Students must label dendrites, cell body (cyton), nucleus, axon and nerve endings correctly. Common errors include writing 'dendrons' instead of dendrites, or labelling the myelin sheath without it being asked. The NCERT diagram in Chapter 6 shows a typical motor neuron with clearly visible dendrites receiving impulses and a long axon transmitting them. Marks are also awarded for describing the function of each part in 1-2 sentences. The impulse always travels in one direction: dendrites receive signal → cell body processes it → axon transmits it → nerve endings pass it to next neuron or effector. Understanding this unidirectional flow helps answer questions on synapse and reflex arc pathway, both high-weightage topics in NCERT Class 10 Science.

Dendrites: Short branched projections of neuron that receive electrical impulses from receptors or other neurons.
Cell Body (Cyton): Contains nucleus and cytoplasm; processes the incoming signal from dendrites.
Nucleus: Controls all metabolic activities of the neuron; located in the cell body.
Axon: Long single fibre that transmits electrical impulse away from cell body towards nerve endings or next neuron.
Myelin Sheath: Fatty insulating covering around axon (in some neurons) that speeds up impulse transmission.
Nerve Endings (Axon Terminals): Branched endings of axon that release neurotransmitters at synapse to pass signal to next neuron or effector.
Direction of Impulse: Always unidirectional — dendrites → cell body → axon → nerve endings → next cell.

Reflex Arc Pathway — Step-by-Step Sequence

Reflex arc is the most frequently asked 3-mark question in CBSE Class 10 Science Chapter 6. The 2024 and 2023 board papers both carried this question with a diagram. Students must draw the pathway clearly showing receptor, sensory neuron, spinal cord (relay neuron), motor neuron and effector in correct sequence, with arrows indicating direction of impulse flow. Marks are deducted if the brain is shown in the pathway, because reflex actions are coordinated by the spinal cord only, ensuring rapid automatic response without conscious thought. Examples include withdrawing hand from hot object, knee-jerk when tapped, blinking when dust enters eye. The NCERT textbook emphasises that thinking (brain involvement) would delay the response and cause harm, hence reflex bypasses the brain. Write the sequence as: stimulus → receptor → sensory neuron → spinal cord (dorsal root → grey matter → ventral root) → motor neuron → effector → response. This exact sequence, with correct terminology, fetches full marks in Class 10 Science solutions.

Step 1 — Stimulus: A sudden change occurs (e.g. touching hot plate, bright light flashing into eye).
Step 2 — Receptor detects: Specialised receptor cells in skin, eye, etc. detect the stimulus and generate electrical impulse.
Step 3 — Sensory neuron: Impulse travels along sensory (afferent) neuron from receptor towards spinal cord.
Step 4 — Spinal Cord: Impulse enters spinal cord through dorsal root; synapse with relay neuron in grey matter; signal passes to motor neuron via ventral root.
Step 5 — Motor neuron: Impulse travels along motor (efferent) neuron from spinal cord to effector organ.
Step 6 — Effector response: Muscle contracts or gland secretes, producing the response (e.g. hand withdrawn, pupil constricts).
Key Point: Brain is NOT involved in reflex arc; only spinal cord coordinates, ensuring speed and involuntary nature.

Plant Hormones (Phytohormones) — Functions and Effects Table

CBSE Class 10 Science examiners love asking 5-mark tabular questions listing plant hormones, their sites of production and physiological effects. Students must spell hormone names correctly: auxin, gibberellin, cytokinin, abscisic acid, ethylene. Common spelling errors include writing 'auxine' or 'giberellin' or 'cytokinine'. Each hormone has specific functions that must not be mixed up. For instance, auxins promote cell elongation and apical dominance, while cytokinins promote cell division and delay ageing. Gibberellins promote stem elongation, seed germination and flowering. Abscisic acid is the stress hormone causing stomatal closure and seed dormancy. Ethylene is the ripening hormone. NCERT Class 10 Science Chapter 6 provides clear descriptions of each; students should prepare a table format answer to save time in the board exam. Mentioning one example or application for each hormone (e.g. auxin used in rooting hormone, ethylene used to ripen bananas artificially) adds value and can fetch bonus marks.

Animal Hormones and Endocrine Glands — Complete Reference Table

The endocrine system table is a guaranteed 5-mark question in CBSE Class 10 Science board exams. Students must memorise gland name, location in body, hormone(s) secreted, function of each hormone and the deficiency or excess disorder. Common mistakes include confusing thyroid disorders (goitre from iodine deficiency leading to less thyroxine) with diabetes (pancreas disorder affecting insulin). Another frequent error is stating that adrenal glands produce adrenaline only, forgetting they also regulate salt balance. The pituitary gland is called the 'master gland' because its hormones control other endocrine glands; mentioning this fact earns an extra mark. NCERT Class 10 Science Chapter 6 covers eight glands in detail: hypothalamus, pituitary, thyroid, parathyroid, thymus, adrenal, pancreas, and gonads (testes in males, ovaries in females). Each gland and its hormones should be revised in tabular form for quick recall. During board exams, presenting this information as a neat table saves time and ensures no point is missed, helping secure full marks in Class 10 Science solutions.

Differences — Nervous vs Hormonal Coordination, Reflex vs Voluntary Action

Three-mark difference-based questions are a staple in CBSE Class 10 Science Chapter 6 exams. Students must present answers in two-column table format with at least three clear points of distinction. Common questions include: Distinguish between nervous and hormonal coordination; Differentiate between reflex action and voluntary action; Difference between receptor and effector. Marks are awarded for clarity, correct terminology and completeness. For example, when comparing nervous and hormonal coordination, students should mention speed (nervous is fast, hormonal is slow), mode of transmission (electrical impulse via neurons vs chemical messenger via blood), duration of effect (nervous is short-lived, hormonal is prolonged) and nature of response (nervous is localised and specific, hormonal is widespread). Similarly, reflex action is involuntary and controlled by spinal cord, while voluntary action is conscious and controlled by brain. NCERT Class 10 Science emphasises these distinctions clearly; students should prepare at least four standard difference tables to cover all possible 3-mark questions in the board exam.

Nervous Coordination: Uses electrical impulses through neurons; very fast (milliseconds); short duration; specific and localised response; controlled by brain and spinal cord.
Hormonal Coordination: Uses chemical messengers (hormones) through blood; slower (seconds to minutes); long-lasting effect; widespread response affecting multiple organs; controlled by endocrine glands.
Reflex Action: Involuntary, automatic, rapid; controlled by spinal cord; no conscious thought; examples include knee-jerk, withdrawing hand from fire, blinking.
Voluntary Action: Conscious, controlled by brain; involves thinking and decision-making; slower than reflex; examples include walking, writing, speaking.
Receptor: Detects stimulus and generates impulse; located in sense organs (eye, ear, nose, tongue, skin); examples include photoreceptors in eye, chemoreceptors in nose.
Effector: Produces response; muscles (movement) or glands (secretion); examples include arm muscles withdrawing hand, salivary glands secreting saliva.

Tropic Movements in Plants — Types and Examples

Tropic movements are directional growth responses in plants towards or away from stimuli, and CBSE Class 10 Science board exams regularly ask 2-3 mark questions listing types with examples. The five main tropisms are phototropism (response to light), geotropism or gravitropism (response to gravity), chemotropism (response to chemicals), hydrotropism (response to water) and thigmotropism (response to touch). Students must clearly state whether the response is positive (towards stimulus) or negative (away from stimulus). For example, shoots show positive phototropism (bend towards light) and negative geotropism (grow upward away from gravity), while roots show positive geotropism (grow downward towards gravity) and positive hydrotropism (grow towards water). The mechanism involves unequal distribution of auxin hormone, causing differential growth rates on either side of the plant part. Mentioning this hormonal control in the answer fetches extra marks. NCERT Class 10 Science Chapter 6 uses simple examples like sunflower head tracking the sun, pollen tube growing towards ovule and tendrils coiling around support, which should be memorised for quick recall in exams.

Phototropism: Growth movement in response to light. Positive in shoots (bend towards light), negative in roots (grow away from light). Example: Sunflower head tracking sun.
Geotropism (Gravitropism): Growth movement in response to gravity. Positive in roots (grow downward), negative in shoots (grow upward). Example: Seedling root always grows downward.
Chemotropism: Growth movement in response to chemical stimulus. Example: Pollen tube grows towards ovule due to chemical attraction.
Hydrotropism: Growth movement in response to water. Positive in roots (grow towards moisture). Example: Plant roots grow towards water source in soil.
Thigmotropism: Growth movement in response to touch or contact. Example: Tendrils of pea plant coil around support when they touch it.
Mechanism: Controlled by auxin hormone; unequal distribution causes one side of plant part to grow faster than the other, resulting in bending movement.

Memory Tricks and Mnemonics for Chapter 6

Class 10 Science Chapter 6 Control and Coordination involves memorising many hormone names, gland locations and tropic movement types, making mnemonics extremely helpful during last-minute revision and in the board exam hall. Students often forget the sequence of reflex arc or mix up plant hormone functions, losing easy marks. A simple mnemonic for the five plant hormones is 'All Good Children Are Excellent' (Auxin, Gibberellin, Cytokinin, Abscisic acid, Ethylene). For remembering reflex arc pathway, use 'Real Students Study More Eagerly' (Receptor, Sensory neuron, Spinal cord, Motor neuron, Effector). To recall the functions of auxin, remember 'Auxin Allows Apical dominance And cell elongation'. For endocrine glands from top to bottom of body, use 'Happy People Try Taking Proper And Tasty Ovaltine' (Hypothalamus, Pituitary, Thyroid, Thymus, Parathyroid, Adrenal, Testes, Ovaries). These memory aids work because they create a mental peg for each term, allowing instant recall even under exam stress. CBSETUTOR.ai offers an AI tutor that generates custom mnemonics based on each student's learning style and can create photo-based flashcards for visual learners, all at just ₹999/month for all subjects and classes 6-12, with a three-day free trial.

Five Plant Hormones: 'All Good Children Are Excellent' = Auxin, Gibberellin, Cytokinin, Abscisic acid, Ethylene.
Reflex Arc Pathway: 'Real Students Study More Eagerly' = Receptor, Sensory neuron, Spinal cord, Motor neuron, Effector.
Auxin Functions: 'Auxin Allows Apical dominance And cell elongation' = Apical dominance, cell elongation.
Endocrine Glands (head to pelvis): 'Happy People Try Taking Proper And Tasty Ovaltine' = Hypothalamus, Pituitary, Thyroid, Thymus, Parathyroid, Adrenal, Testes, Ovaries.
Five Tropisms: 'Plants Go Crazy Handling Things' = Phototropism, Geotropism, Chemotropism, Hydrotropism, Thigmotropism.
Neuron Parts in order of impulse: 'Dumb Children Never Ask' = Dendrites, Cell body (cyton), Nucleus (inside cell body), Axon.
Thyroid Deficiency: 'No Iodine = No Thyroxine = Goitre' (swelling in neck).

Common Mistakes, Notation and Spelling Errors to Avoid

CBSE Class 10 Science examiners are strict about scientific terminology and correct spelling, especially in Chapter 6 Control and Coordination where biological terms are frequently misspelt. Writing 'neurone' instead of 'neuron', 'hormons' instead of 'hormones', 'giberellin' instead of 'gibberellin', 'auxine' instead of 'auxin' or 'cytokinine' instead of 'cytokinin' leads to mark deductions. Another common error is confusing geotropism with phototropism in examples, or stating that reflex actions are controlled by the brain instead of the spinal cord. Students also make mistakes in diagrams, such as drawing arrows in the wrong direction in reflex arc or labelling the axon as dendrite. In hormone tables, mixing up gland names with hormone names (e.g. writing 'thyroid hormone' when it should be 'thyroxine') costs marks. When explaining phototropism, students often forget to mention the role of auxin, which is essential for full marks. Practising NCERT Class 10 Science solutions and past board papers helps identify and correct these recurring errors before the final exam, ensuring no silly mistakes rob you of marks in a high-scoring chapter like Control and Coordination.

Spelling: Write 'neuron' not 'neurone'; 'auxin' not 'auxine'; 'gibberellin' not 'giberellin'; 'cytokinin' not 'cytokinine'; 'synapse' not 'synapsis'.
Reflex Arc: Never show brain in reflex arc pathway; only spinal cord coordinates reflex actions.
Direction of Impulse: Always draw arrows showing impulse direction in diagrams (receptor → sensory neuron → spinal cord → motor neuron → effector).
Hormone vs Gland: Do not confuse gland name with hormone name. E.g. Thyroid gland secretes thyroxine, not 'thyroid hormone'.
Positive vs Negative Tropism: Clearly state direction — positive means towards stimulus, negative means away from stimulus.
Phototropism Mechanism: Must mention auxin hormone and unequal growth; do not just say 'plant bends towards light' without explaining why.
Neuron Diagram: Label dendrites (plural, multiple branches) and axon (singular, one long fibre) correctly; do not interchange them.
Insulin Function: Write 'lowers blood sugar' or 'promotes glucose uptake', not 'controls sugar' (too vague for full marks).
Goitre Cause: State 'deficiency of iodine leading to less thyroxine secretion', not just 'iodine deficiency' or 'thyroid problem'.
Nastic vs Tropic: Tropic movements are directional (towards/away from stimulus); nastic movements are non-directional (e.g. touch-me-not leaves folding).

Solved Mini-Examples Applying Key Concepts

Working through short application-based questions helps cement understanding of Control and Coordination concepts and prepares students for the variety of question styles in CBSE Class 10 Science board exams. These three examples cover reflex action, plant hormones and endocrine disorders, which together account for around 10-12 marks in the typical board paper. Notice how each answer uses precise NCERT terminology, provides clear reasoning and includes the expected keywords that examiners look for when awarding marks. Practising such examples repeatedly until you can write them fluently within two minutes each will significantly boost your speed and accuracy in the exam hall, leaving more time for lengthy numerical chapters like Light or Electricity.

One-Glance Last-Minute Revision Box

This rapid-fire summary condenses the entire CBSE Class 10 Science Chapter 6 Control and Coordination into bullet points you can revise in under five minutes right before entering the exam hall. Every term here has appeared in previous board papers. Read this list aloud twice the night before your exam and once in the morning for maximum retention. Keep this page bookmarked on your phone for quick mobile revision during travel to school or tuition. For students who want personalised last-minute doubt clearing, CBSETUTOR.ai provides 24×7 AI tutor support where you can upload a photo of any diagram or question from Control and Coordination and get an instant step-by-step explanation in simple language. The service covers all CBSE subjects for classes 6 to 12 at a flat ₹999 per month, with no hidden charges and a three-day free trial to experience the AI tutor before committing. This is especially valuable for biology chapters like this one, where diagram labelling and definitions carry significant marks and need quick clarification during revision.

Control = detecting stimulus and responding; Coordination = organs working together systematically.
Reflex arc pathway: Receptor → Sensory neuron → Spinal cord → Motor neuron → Effector. Brain NOT involved.
Neuron parts: Dendrites (receive impulse) → Cell body → Axon (transmit impulse) → Nerve endings (release neurotransmitter at synapse).
Synapse: Gap between two neurons; impulse transmitted by chemical neurotransmitters.
Five plant hormones: Auxin (cell elongation, phototropism), Gibberellin (stem elongation), Cytokinin (cell division), Abscisic acid (stomatal closure, stress), Ethylene (ripening).
Phototropism: Shoot grows towards light (positive), root away from light (negative). Due to auxin on shaded side causing more growth.
Geotropism: Root grows downward (positive), shoot upward (negative).
Chemotropism: Pollen tube towards ovule. Hydrotropism: Root towards water. Thigmotropism: Tendril coiling on touch.
Endocrine glands: Pituitary (growth hormone), Thyroid (thyroxine), Pancreas (insulin), Adrenal (adrenaline), Testes (testosterone), Ovaries (oestrogen).
Disorders: Dwarfism (less GH), Gigantism (excess GH), Goitre (iodine deficiency → less thyroxine), Diabetes (less insulin).
Nervous vs Hormonal: Nervous = fast, electrical, short-duration, localised; Hormonal = slow, chemical, long-duration, widespread.
Reflex vs Voluntary: Reflex = spinal cord, involuntary, fast; Voluntary = brain, conscious, slower.
Master gland: Pituitary (controls other glands). Stress hormone: Adrenaline (fight or flight). Ripening hormone: Ethylene.
Common exam questions: Reflex arc diagram (3 marks), neuron diagram (2 marks), plant hormone table (5 marks), endocrine gland table (5 marks), differences (3 marks).

How CBSETUTOR.ai Helps You Master Control and Coordination

CBSE Class 10 Science Chapter 6 Control and Coordination is a theory-intensive chapter where students often struggle with memorising hormone functions, drawing accurate labelled diagrams and writing crisp definitions that match mark-scheme expectations. CBSETUTOR.ai offers a 24×7 AI tutor designed specifically for CBSE students, allowing you to upload a photo of any diagram from NCERT Chapter 6, such as the neuron structure or reflex arc pathway, and receive an instant labelled explanation with memory tricks. If you are confused about why shoots show positive phototropism while roots show negative phototropism, or cannot remember which gland secretes which hormone, simply type or speak your question and the AI tutor provides a clear answer using NCERT terminology, often with visual aids and comparison tables. The platform also generates custom practice questions on topics like tropic movements, hormonal coordination and differences between nervous and hormonal systems, so you can test yourself until every concept is rock-solid. Whether you are in a metro city with access to top coaching or in a Tier-2 town relying solely on school teaching, CBSETUTOR.ai levels the playing field by giving every CBSE student access to high-quality, instant doubt resolution at an affordable ₹999 per month for all subjects across classes 6-12. Start with the three-day free trial to experience how an AI tutor can transform your revision strategy and boost your confidence before board exams, ensuring you score full marks in high-weightage chapters like Control and Coordination.

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Frequently asked questions

Is there any numerical formula in CBSE Class 10 Science Chapter 6 Control and Coordination?+

No, Chapter 6 Control and Coordination contains no numerical formulas or calculations. It is entirely theory-based, focusing on definitions, biological pathways like reflex arc, neuron structure, plant hormones, animal hormones and endocrine glands. Questions are descriptive, diagram-based or tabular, carrying 2 to 5 marks each in CBSE board exams.

Which diagram is most important for board exams in Control and Coordination?+

The reflex arc pathway diagram is the most important, appearing almost every year as a 3-mark question. Students must draw and label: receptor, sensory neuron, spinal cord, motor neuron and effector with arrows showing impulse direction. The neuron structure diagram is also frequently asked as a 2-mark question. Practise both diagrams repeatedly for accuracy and speed.

How many plant hormones do I need to memorise for Class 10 Science Chapter 6?+

NCERT Class 10 Science Chapter 6 covers five main plant hormones: Auxin, Gibberellin, Cytokinin, Abscisic acid and Ethylene. You must know the correct spelling, function and one example for each. A 5-mark tabular question listing all five hormones with functions is very common in CBSE board exams, so prepare a standard table format answer.

What is the difference between reflex action and voluntary action in simple terms?+

Reflex action is involuntary, automatic and very fast, controlled by the spinal cord without involvement of the brain (e.g. blinking, knee-jerk). Voluntary action is conscious, controlled by the brain, involves thinking and decision-making, and is comparatively slower (e.g. walking, writing, speaking). This 3-mark difference question appears frequently in board exams.

Which endocrine gland is called the master gland and why?+

The Pituitary gland is called the master gland because it secretes hormones that control the functioning of other endocrine glands in the body. For example, pituitary hormones regulate the thyroid gland, adrenal glands and reproductive glands. It also secretes Growth Hormone (GH) that regulates overall body growth and development.

How does auxin cause phototropism in plants?+

Auxin is a plant hormone that accumulates on the shaded side of the shoot when light falls from one direction. The higher concentration of auxin on the shaded side causes those cells to elongate faster than cells on the lighted side, resulting in the shoot bending towards the light source. This directional growth response to light is called positive phototropism, commonly seen in shoots and stems.

What causes diabetes and which hormone is involved?+

Diabetes mellitus is caused by deficiency of the hormone Insulin, which is secreted by the Pancreas (specifically by islets of Langerhans). Insulin lowers blood sugar levels by promoting glucose uptake from blood into body cells. When insulin secretion is insufficient or body cells become resistant to insulin, blood sugar levels remain high, leading to diabetes. Treatment involves insulin injections or medication.

What is the correct sequence of reflex arc pathway?+

The correct sequence is: Stimulus → Receptor (detects stimulus) → Sensory neuron (carries impulse to spinal cord) → Spinal cord (processes and relays impulse) → Motor neuron (carries impulse to effector) → Effector (muscle or gland responds) → Response. Remember, the brain is NOT involved in reflex arc; only the spinal cord coordinates the reflex action.

How many marks does Chapter 6 Control and Coordination carry in CBSE Class 10 Science board exam?+

Chapter 6 typically carries around 8 to 10 marks in the CBSE Class 10 Science board exam (out of 80 marks). Questions include 2-mark diagram labelling (neuron or reflex arc), 3-mark short answers (reflex action, phototropism, differences), and 5-mark long answers or tables (plant hormones, endocrine glands). It is a high-scoring chapter if definitions and diagrams are well-prepared.

What is the best way to revise Control and Coordination one day before the exam?+

Focus on these high-weightage topics: memorise the five plant hormones and their functions, endocrine gland-hormone-function table, reflex arc pathway with diagram, neuron structure diagram, differences (nervous vs hormonal, reflex vs voluntary), and definitions of stimulus, receptor, effector, synapse, tropism. Use the one-glance revision box on this page, read it aloud twice and practise drawing diagrams quickly. Avoid starting new topics; revise only what you have already studied.

Can CBSETUTOR.ai help me with diagram practice for Control and Coordination?+

Yes, CBSETUTOR.ai allows you to upload a photo of any NCERT diagram from Chapter 6 (neuron, reflex arc, brain structure) and the AI tutor provides instant labelling, explanations and memory tricks. You can also ask the tutor to generate blank diagram practice sheets or quiz you on labelling. This helps you master diagram-based questions that carry 2-3 marks each in board exams. Try the three-day free trial at ₹999/month for all subjects.

What are nastic movements and how are they different from tropic movements?+

Nastic movements are non-directional movements of plant parts in response to a stimulus, independent of the direction of the stimulus. Example: touch-me-not plant leaves folding when touched. Tropic movements are directional growth movements towards or away from the stimulus direction. Example: shoot bending towards light (phototropism). This difference is sometimes asked as a 2-mark question in CBSE exams.

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