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NCERT Solutions for CBSE Class 7 Science Chapter 2: Nutrition in Animals

CBSE Class 7 Science Chapter 2 Nutrition in Animals is a foundational chapter that builds understanding of how animals, including humans, process food for energy and growth. Unlike plants that prepare their own food through photosynthesis, animals are heterotrophs who must consume other organisms. This chapter systematically explains the human digestive system with its specialized organs, explores fascinating adaptations like the ruminant stomach, and introduces diverse feeding mechanisms across the animal kingdom. The NCERT Solutions presented here answer all textbook questions with accuracy, using diagrams and examples that align with CBSE examination patterns. Whether preparing for unit tests or annual exams, these solutions serve as a reliable study tool that clarifies every concept from tooth structure to enzymatic digestion.

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Key takeaways

  • ✓CBSE Class 7 Science Chapter 2 Nutrition in Animals covers five major processes: ingestion, digestion, absorption, assimilation, and egestion in the human digestive system
  • ✓The human alimentary canal is approximately 8-10 meters long and includes the mouth, oesophagus, stomach, small intestine, large intestine, and anus
  • ✓Ruminants like cows possess a four-chambered stomach (rumen, reticulum, omasum, abomasum) that enables them to digest cellulose through microbial action
  • ✓Different animals exhibit distinct feeding modes: filter feeding in whales, fluid feeding in mosquitoes, and scraping in snails
  • ✓The small intestine is the primary site for nutrient absorption, with villi increasing the surface area for efficient uptake into the bloodstream
  • ✓Human teeth are of four types — incisors, canines, premolars, and molars — each adapted for specific functions in mechanical digestion
  • ✓Saliva contains the enzyme salivary amylase that initiates carbohydrate breakdown in the mouth itself

Understanding the Core Concepts in CBSE Class 7 Science Chapter 2 Nutrition in Animals

CBSE Class 7 Science Chapter 2 Nutrition in Animals introduces the holistic process by which animals obtain nutrients from food. The chapter distinguishes between different nutritional modes and emphasizes that nutrition is not just eating, but a complete sequence of events. The five key steps that constitute nutrition in animals are ingestion (taking in food), digestion (breaking down complex food into simpler molecules), absorption (nutrients passing into the blood), assimilation (cells using absorbed nutrients), and egestion (removing undigested waste). The human body accomplishes these steps through a specialized digestive system comprising the alimentary canal and associated glands. The alimentary canal forms a continuous tube from mouth to anus, while glands like salivary glands, liver, and pancreas secrete digestive juices. Understanding these foundational concepts helps students appreciate why different animals have evolved varied digestive structures based on their diet and lifestyle.
  • Ingestion: The process of taking food into the body through the mouth
  • Digestion: Breakdown of complex food molecules into simpler, absorbable forms using mechanical and chemical processes
  • Absorption: Movement of digested nutrients from the intestine into the bloodstream
  • Assimilation: Utilization of absorbed nutrients by body cells for energy, growth, and repair
  • Egestion: Elimination of undigested material as faeces through the anus

Detailed Solutions for Questions on the Human Digestive System

The human digestive system forms the core of CBSE Class 7 Science Chapter 2 Nutrition in Animals, and textbook questions extensively test understanding of organ functions and processes. The alimentary canal begins at the mouth, where teeth mechanically break food and salivary amylase starts starch digestion. Food then travels through the oesophagus via peristalsis — rhythmic muscle contractions that push food downward independent of gravity. In the stomach, gastric glands secrete hydrochloric acid (killing bacteria and providing acidic medium) and pepsin (digesting proteins). The stomach churns food into a semi-solid paste called chyme. The small intestine, approximately 7.5 meters long, receives bile from the liver (emulsifying fats) and pancreatic juice (containing enzymes for proteins, fats, and carbohydrates). The inner walls have thousands of finger-like projections called villi that absorb nutrients into blood capillaries. The large intestine absorbs water and forms solid waste, which is expelled through the anus.
  • Mouth: Teeth cut and grind food; salivary amylase begins starch breakdown; tongue mixes food and helps in swallowing
  • Oesophagus: A 25 cm muscular tube using peristalsis to transport food to the stomach
  • Stomach: J-shaped muscular bag that stores food for 4-5 hours and initiates protein digestion
  • Small intestine: Longest part (7.5 m) where final digestion occurs and nutrients are absorbed through villi
  • Large intestine: Absorbs water from undigested food and stores waste temporarily before egestion

NCERT Solutions on Digestion in Ruminants

CBSE Class 7 Science Chapter 2 Nutrition in Animals dedicates significant attention to ruminants — grass-eating animals like cows, buffaloes, goats, and sheep that have evolved a sophisticated digestive system to break down cellulose. Unlike humans who cannot digest cellulose (it passes as roughage), ruminants have a four-chambered stomach. When a cow grazes, it quickly swallows grass without much chewing. This food goes into the rumen, the largest chamber, where cellulose-digesting bacteria partially break down the plant material. The partially digested food (cud) then moves to the reticulum and is regurgitated back to the mouth for thorough chewing — a process called rumination or 'chewing the cud.' After re-chewing, the food passes through the omasum (absorbing water) and finally reaches the abomasum (the true stomach), where normal digestion like in humans occurs. This process allows ruminants to extract maximum nutrition from plant material that would otherwise be indigestible.
  • Rumen: Largest chamber containing bacteria that digest cellulose through fermentation
  • Reticulum: Works with rumen to form cud balls for regurgitation
  • Omasum: Absorbs water and reduces particle size
  • Abomasum: True stomach where enzymatic digestion occurs, similar to the human stomach

Tooth Structure and Types: Answering NCERT Questions

CBSE Class 7 Science Chapter 2 Nutrition in Animals includes important questions on human tooth structure, a topic that appears frequently in CBSE examinations. Humans have two sets of teeth in their lifetime: milk teeth (20 teeth in children) and permanent teeth (32 teeth in adults). Each tooth has two main parts: the crown (visible above the gum) and the root (embedded in the jawbone). The outer layer of the crown is enamel, the hardest substance in the human body, which protects against wear and bacterial acid. Below enamel is dentine, a bone-like material, and at the center is the pulp cavity containing blood vessels and nerves. There are four types of teeth, each adapted for specific functions. Incisors (8 teeth) are flat and chisel-shaped for cutting food. Canines (4 teeth) are pointed for tearing. Premolars (8 teeth) have a flat surface with ridges for crushing. Molars (12 teeth, including wisdom teeth) are large with a broad surface for grinding food thoroughly.

Step-by-Step Solutions for In-Text NCERT Questions

The in-text questions scattered throughout CBSE Class 7 Science Chapter 2 Nutrition in Animals are designed to check conceptual understanding as students progress through the chapter. These questions often require application rather than rote memorization. For example, one question asks students to explain why the small intestine in herbivores is longer than in carnivores. The answer requires understanding that plant material (cellulose-rich) is harder to digest than meat, so herbivores need more time and surface area for digestion and absorption. Another in-text question asks about the role of villi. Students must explain that villi are finger-like projections on the inner lining of the small intestine that increase surface area manifold, allowing efficient absorption of nutrients into the bloodstream. Each villus contains a network of blood capillaries and a lymph vessel, ensuring that glucose, amino acids, vitamins, and minerals enter circulation quickly. These questions build analytical skills crucial for higher classes.
  • Question: What is the role of hydrochloric acid in the stomach? Answer: It kills bacteria in food, provides acidic medium for pepsin enzyme to work, and helps break down food particles
  • Question: Why is absorption important? Answer: Absorption transfers digested nutrients from the intestine into blood, making them available to all body cells for energy and growth
  • Question: What happens if bile is not secreted? Answer: Fats will not emulsify into small droplets, making their digestion by lipase enzyme very difficult and inefficient
  • Question: How does food move through the oesophagus? Answer: Through peristalsis — wave-like muscle contractions that push food downward even when you are upside down

Exercise Questions with Detailed Explanations

The exercise section at the end of CBSE Class 7 Science Chapter 2 Nutrition in Animals consolidates learning and is the primary source of questions for school tests and term exams. A common question asks students to fill in the blanks or match organs with functions. For instance, matching the liver with bile secretion, pancreas with pancreatic juice, and stomach with gastric juice tests recall of organ functions. Another frequent question type asks students to draw and label diagrams — such as the human alimentary canal showing mouth, oesophagus, stomach, small intestine, large intestine, liver, and pancreas. Labelling must be accurate with clear leader lines. True/false questions test common misconceptions: 'Ruminants do not chew their food at all' is false because they chew the cud. Short answer questions require 2-3 sentence responses explaining processes like how water is absorbed in the large intestine or why saliva is important. Long answer questions expect paragraph-length responses on the complete digestive process or the structure and function of villi.

Different Modes of Feeding in Animals

CBSE Class 7 Science Chapter 2 Nutrition in Animals expands student perspective beyond human nutrition by exploring diverse feeding strategies across the animal kingdom. These modes reflect evolutionary adaptations to different food sources and environments. Bees and hummingbirds use a sucking mode, drawing nectar through specialized mouthparts. Snails and limpets scrape food using a radula, a tongue-like organ with tiny teeth. Mosquitoes and leeches are fluid feeders that pierce skin and suck blood or other body fluids. Frogs use a sticky tongue to capture insects in a fraction of a second. Snakes swallow prey whole due to highly flexible jaws. Filter feeders like baleen whales strain tiny organisms from water using baleen plates. Spiders inject digestive juices into prey and suck the liquefied tissues. Understanding these modes helps students appreciate biodiversity and the relationship between form and function in nature.
  • Sucking: Bees, hummingbirds, and butterflies use tubular mouthparts to draw liquid food like nectar
  • Scraping: Snails use radula to scrape algae from surfaces
  • Fluid feeding: Mosquitoes pierce skin with needle-like mouthparts and suck blood
  • Swallowing whole: Snakes have flexible jaws to swallow prey much larger than their head diameter
  • Filter feeding: Whales filter plankton and small fish from large volumes of water
  • Sponging: Houseflies secrete saliva on solid food to liquefy it, then sponge it up

Diagram-Based Questions and Labelling Practice

CBSE examinations for Class 7 Science consistently include diagram-based questions worth 2-3 marks each, making this a crucial component of CBSE Class 7 Science Chapter 2 Nutrition in Animals preparation. Students must practice drawing the human alimentary canal with correct proportions and clear labels. The stomach should be shown as a J-shaped bag on the left side, the small intestine as a long coiled structure, and the large intestine as a broader tube forming a frame around the small intestine. The liver should be positioned above the stomach on the right side, with the pancreas behind the stomach. Another frequently asked diagram is the tooth structure showing enamel (outermost white layer), dentine (yellowish layer beneath enamel), pulp cavity (central space with nerves and blood vessels), and root embedded in the jawbone. For ruminants, students may need to sketch the four-chambered stomach with labels for rumen, reticulum, omasum, and abomasum. Clear, neat diagrams with accurate spellings in labels fetch full marks.
  • Always use a sharp pencil for diagrams and draw smooth, continuous lines
  • Label lines should be straight, drawn with a ruler, and should not cross each other
  • Write labels horizontally in clear handwriting, maintaining consistent size
  • Underline scientific terms like oesophagus, duodenum, or abomasum
  • If the question specifies 'draw and label,' a neat diagram with labels is mandatory for full marks

Common Mistakes Students Make in CBSE Class 7 Science Chapter 2 Nutrition in Animals

After reviewing thousands of answer scripts, certain recurring errors emerge in CBSE Class 7 Science Chapter 2 Nutrition in Animals responses. Many students confuse digestion with absorption, writing that digestion occurs in the small intestine when they mean absorption. Another common error is stating that the stomach digests all types of food, when in fact only proteins are digested there; carbohydrates and fats are digested in the small intestine. Students often misspell key terms: writing 'alimentry' instead of alimentary, 'vilai' instead of villi, or 'esofagus' instead of oesophagus. In ruminant questions, some incorrectly state that cows have four stomachs, when the correct answer is one stomach with four chambers. When explaining peristalsis, students sometimes write that it occurs only in the stomach, missing the fact that it happens throughout the alimentary canal. Regarding teeth, a frequent mistake is stating that adults have 28 teeth instead of 32, forgetting the four wisdom teeth. Awareness of these pitfalls helps students write more accurate, scoring answers.
  • Mistake: Writing that digestion happens in villi. Correction: Villi absorb already-digested nutrients; digestion happens in the intestinal lumen
  • Mistake: Claiming the liver digests food. Correction: The liver produces bile that emulsifies fats but does not directly digest
  • Mistake: Stating that saliva digests proteins. Correction: Saliva contains amylase that digests starch, not protein
  • Mistake: Forgetting to mention bacteria in the rumen. Correction: Cellulose digestion in ruminants depends entirely on symbiotic bacteria

How CBSETUTOR.ai Helps Master Chapter 2 Nutrition in Animals

Students and parents across India trust CBSETUTOR.ai as a 24×7 AI tutor for CBSE Classes 6-12. For CBSE Class 7 Science Chapter 2 Nutrition in Animals, the platform offers instant doubt resolution by allowing students to upload photos of any NCERT question or worksheet. The AI has ingested the complete NCERT Class 7 Science textbook and can explain every concept from the alimentary canal to ruminant digestion using the exact terminology students need for exams. Unlike pre-recorded videos that cannot address individual confusion points, CBSETUTOR.ai adapts explanations to each student. If a child struggles with understanding peristalsis, the AI provides multiple analogies, diagrams, and step-by-step breakdowns until clarity emerges. Parents appreciate the flat ₹999 per month pricing that covers all subjects and classes 6-12, making expert help affordable. The 3-day free trial requires no credit card, letting families experience personalized NCERT-aligned support risk-free. Whether preparing for a unit test on nutrition or revising for annual exams, students gain confidence through interactive, on-demand help.
  • Upload any diagram or question from CBSE Class 7 Science Chapter 2 Nutrition in Animals and get instant, step-by-step solutions
  • Practice unlimited questions on digestion, ruminants, teeth types, and feeding modes with immediate feedback
  • Access NCERT-aligned explanations that use the same language and examples as the textbook
  • Clarify doubts at 2 am before an exam without waiting for tuition class
  • One subscription at ₹999/month covers your child for every subject from Class 6 to 12

Examination Tips and Marking Scheme for Nutrition in Animals

CBSE Class 7 Science Chapter 2 Nutrition in Animals typically carries 10-12 marks in the final examination, distributed across multiple question types. Very short answer questions (1 mark) ask for definitions or one-sentence answers like naming the enzyme in saliva or stating the function of villi. Short answer questions (2-3 marks) require brief explanations such as describing the role of the stomach or explaining why ruminants chew cud. Long answer questions (5 marks) demand detailed responses on the complete digestive process, often accompanied by a labeled diagram that itself carries 2-3 marks. To score full marks, students must use correct scientific terminology (write oesophagus, not food pipe; write assimilation, not utilization), provide diagrams when asked, and structure answers in clear points rather than continuous paragraphs. Underlining key terms like digestion, absorption, and egestion demonstrates conceptual clarity. In diagram questions, accuracy matters more than artistic skill — labels must be correctly spelled and positioned.

Connecting Chapter 2 to Real-Life and Other CBSE Subjects

CBSE Class 7 Science Chapter 2 Nutrition in Animals connects to students' daily lives in numerous ways, making the content more engaging and memorable. Understanding the digestive system explains why doctors advise eating slowly and chewing food thoroughly — better mechanical breakdown reduces the digestive burden on the stomach and intestines. The chapter clarifies why we feel hungry every few hours: the stomach empties, and blood glucose levels drop, triggering hunger signals. Learning about ruminants helps rural students appreciate why farmers allow cows to rest after grazing — the animals need time for rumination. The concept of dietary fiber (cellulose) that humans cannot digest but need for healthy bowel movements ties to nutrition education. Beyond Science, the chapter intersects with Social Studies when discussing agricultural practices and livestock rearing. In Hindi or English, students can write essays on balanced diet or animal adaptations. Mathematics comes in when calculating the approximate length of intestines (small intestine 7.5 m, large intestine 1.5 m, total 9 m). Such interdisciplinary connections deepen comprehension and make CBSE Class 7 Science Chapter 2 Nutrition in Animals relevant beyond exams.
  • Health education: Understanding digestion reinforces the importance of drinking water, eating fiber, and maintaining regular meal times
  • Agriculture link: Knowing ruminant digestion helps appreciate cattle farming practices and fodder choices
  • Environmental science: Learning about different feeding modes illustrates biodiversity and ecological niches
  • Biology foundation: Chapter 2 lays groundwork for Class 10 topics like enzymes, nutrition, and life processes

Additional Practice Questions Beyond the NCERT Textbook

To thoroughly prepare for CBSE examinations, students should practice additional questions on CBSE Class 7 Science Chapter 2 Nutrition in Animals beyond the textbook exercises. Sample questions include: Compare the digestive system of humans and ruminants (5 marks). Explain why the small intestine is the primary site of digestion and absorption (3 marks). Draw and label the structure of a human tooth (2 marks). What is peristalsis and where does it occur? (2 marks) How does bile help in digestion even though it contains no enzymes? (3 marks) Why do doctors recommend that we chew our food at least 32 times before swallowing? (2 marks) If the villi of the small intestine were removed, what would happen to the digestive process? (3 marks). These questions require deeper analysis and application of concepts, preparing students for the higher-order thinking questions increasingly common in CBSE papers. Working through 20-30 such additional questions solidifies understanding and builds exam confidence.
  • Practice short notes on each organ: write 50 words each on stomach function, liver function, and pancreas function
  • Create comparison tables: herbivore vs carnivore digestive systems, milk teeth vs permanent teeth
  • Draw and redraw diagrams 5 times each to build muscle memory for exam conditions
  • Solve previous years' CBSE question papers to understand the most frequently tested concepts

Revision Strategy for Scoring Maximum Marks in Chapter 2

Strategic revision is key to excelling in CBSE Class 7 Science Chapter 2 Nutrition in Animals. Students should begin by reading the entire NCERT chapter once, highlighting key terms like ingestion, egestion, rumen, villi, peristalsis, and salivary amylase. Next, create a one-page summary sheet listing the five steps of nutrition, functions of each digestive organ, the four types of teeth, and the four chambers of the ruminant stomach. This sheet becomes the go-to resource for quick revision before exams. Practice all NCERT questions — both in-text and exercise — writing answers in a notebook as if in an exam. After self-assessment, compare answers with the solutions provided here or in guidebooks, noting areas of weakness. Focus extra time on diagram practice, as these are easy scoring opportunities if executed well. One week before exams, revise the summary sheet daily and attempt a mock test simulating exam conditions: 30 minutes, closed book, answering 5 questions from the chapter. This builds speed and accuracy, both essential for CBSE exams.
  • Day 1-2: Read NCERT chapter thoroughly, underline unfamiliar terms, and understand all diagrams
  • Day 3-4: Solve all in-text and exercise questions in writing, not just mentally
  • Day 5: Create flashcards for definitions (e.g., front: 'What is assimilation?' back: 'Use of absorbed nutrients by cells')
  • Day 6-7: Practice drawing and labeling diagrams 5 times each without referring to the book
  • Day 8-9: Attempt previous year questions and CBSE sample papers on nutrition
  • Day 10: Final quick revision using summary sheet, focusing on weak areas identified during practice

Frequently asked questions

Will my child lose marks if they write 'food pipe' instead of 'oesophagus' in CBSE Class 7 Science Chapter 2 Nutrition in Animals answers?+
Yes, examiners expect correct scientific terminology. While meaning may be clear, CBSE marking schemes award full marks for precise terms like oesophagus, alimentary canal, and villi. Encourage your child to use NCERT terminology consistently to avoid losing half-marks in definitions and explanations.
How many marks does CBSE Class 7 Science Chapter 2 Nutrition in Animals carry in the final exam, and what question types appear?+
Chapter 2 typically carries 10-12 marks across question types: 1-mark objective questions (definitions, fill-in-blanks), 2-3 mark short answers (explain a process or organ function), and 5-mark long answers (complete digestion process with diagram). Diagram questions often carry 2-3 marks separately. Practicing each format is essential.
My daughter finds it hard to remember all the organs in the digestive system. What memory technique works best for CBSE Class 7 Science Chapter 2 Nutrition in Animals?+
Try the mnemonic 'My Elephant Swallowed Strawberry Lollipops Loudly' for Mouth-Esophagus-Stomach-Small intestine-Large intestine. For organs and glands, add Liver and Pancreas. Drawing the alimentary canal repeatedly while saying organ names aloud builds both visual and verbal memory, proven more effective than reading alone.
Are questions on ruminants important in exams, or can we skip that section of CBSE Class 7 Science Chapter 2 Nutrition in Animals?+
Questions on ruminants appear almost every year, worth 2-3 marks. Common questions ask: Why do cows chew cud? Name the four chambers. How is cow digestion different from humans? This section is compact yet scoring — spending 20 minutes mastering it yields reliable exam marks. Definitely do not skip.
What is the difference between digestion and absorption? My son keeps mixing them up in CBSE Class 7 Science Chapter 2 Nutrition in Animals.+
Digestion is breaking down complex food (like starch, protein, fat) into simpler molecules (glucose, amino acids, fatty acids) that can pass through intestinal walls. Absorption is the process where these already-digested nutrients move from the small intestine into the bloodstream. Think: digestion simplifies, absorption transports.
How should students label diagrams in CBSE Class 7 Science Chapter 2 Nutrition in Animals to get full marks?+
Use a sharp pencil, draw neat lines with a ruler from the part to the label, ensure no lines cross, write labels horizontally (not slanted), underline scientific terms, and spell correctly. Labels like 'stomach,' 'small intestine,' 'liver,' 'pancreas,' and 'villi' must be accurate. Even one misspelled label can cost half a mark.
Can my child score full marks if they explain the digestive process without mentioning enzyme names in CBSE Class 7 Science Chapter 2 Nutrition in Animals answers?+
For Class 7, mentioning specific enzymes like salivary amylase and pepsin adds depth and shows thorough understanding, but is not always mandatory if the question asks only for the overall process. However, for 5-mark answers, including enzymes (amylase for starch, pepsin for proteins) often distinguishes an excellent answer from an average one.
How is CBSE Class 7 Science Chapter 2 Nutrition in Animals different from the nutrition chapter in Class 6?+
Class 6 focused on plant nutrition and photosynthesis. Class 7 shifts entirely to animal (and human) nutrition, introducing the digestive system, enzyme action, and varied feeding modes. The chapters complement each other — plants as producers (Class 6) and animals as consumers (Class 7) — forming a complete picture of nutrition in living organisms.
My son asks why humans have different types of teeth. How should I explain this concept from CBSE Class 7 Science Chapter 2 Nutrition in Animals?+
Humans are omnivores eating both plants and meat, requiring teeth for different tasks. Incisors cut vegetables and fruits. Canines tear meat. Premolars and molars crush and grind both plant and animal food. This variety contrasts with herbivores (mostly flat grinding teeth) and carnivores (mostly sharp tearing teeth), illustrating adaptation to diet.
Is it necessary to memorize the length of the small intestine and large intestine for CBSE Class 7 Science Chapter 2 Nutrition in Animals exams?+
Yes, these are frequently asked factual recall questions. Remember: small intestine is approximately 7.5 meters (longest part), large intestine is about 1.5 meters (broader but shorter). Knowing these numbers helps answer 'Why is the small intestine called small if it is the longest?' — small refers to diameter, not length.
Are there any common practical activities or experiments related to CBSE Class 7 Science Chapter 2 Nutrition in Animals that schools conduct?+
Schools sometimes demonstrate starch digestion by mixing saliva with cooked rice and testing with iodine (blue color disappears as starch converts to sugar). Another activity is examining the teeth of classmates to identify incisors, canines, premolars, and molars. While not mandatory, understanding these activities enriches conceptual learning.
Can CBSETUTOR.ai help if my child is stuck on a specific diagram or numerical problem in CBSE Class 7 Science Chapter 2 Nutrition in Animals?+
Absolutely. Students can photograph the exact diagram or question from their textbook or worksheet and upload it to CBSETUTOR.ai. The AI provides step-by-step guidance, correct labeling, explanations in simple language, and even alternative ways to remember complex concepts. The ₹999/month plan covers unlimited doubts across all subjects for Classes 6-12, with a 3-day free trial.

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