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Important Questions: CBSE Class 7 Science Chapter 2 Nutrition in Animals

Nutrition in Animals is a scoring chapter in CBSE Class 7 Science that blends conceptual understanding with diagram-based questions. This question bank provides 18 exam-pattern questions across all difficulty levels, mirroring the exact format CBSE uses in periodic tests and annual exams. Each question comes with a model answer crafted from NCERT terminology, helping students frame answers that fetch full marks.

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Key takeaways

  • ✓Chapter 2 Nutrition in Animals carries 5-7 marks in CBSE Class 7 annual exams with equal distribution across VSA, SAQ and LAQ formats
  • ✓Human digestive system with 6 main organs (mouth, oesophagus, stomach, small intestine, large intestine, anus) is the most frequently asked topic
  • ✓Ruminant digestion questions appear in 80% of CBSE papers, focusing on four-stomach structure and cud-chewing mechanism
  • ✓Diagram-based questions on tooth structure and digestive system carry 3-5 marks and require accurate labelling
  • ✓Differentiation questions comparing holozoic, saprophytic, and parasitic nutrition modes are common 2-mark questions
  • ✓Case-based questions linking real-life examples like Amoeba feeding or grass-eaters' digestion fetch 5 marks in term exams
  • ✓Common mistakes include confusing villi with cilia, mixing ruminant stomach chambers, and incorrect digestive juice names

Chapter Overview and Marks Weightage in CBSE Exams

CBSE Class 7 Science Chapter 2 Nutrition in Animals typically contributes 5-7 marks to the annual examination and 3-4 marks in each periodic test. The chapter explores how different organisms take in food and digest it, focusing on the human digestive system as the primary model. CBSE distributes marks fairly evenly: 1-2 marks for objective/VSA questions testing definitions and one-word answers, 4-6 marks for short-answer questions requiring process explanations, and 3-5 marks for diagram-based or long-answer questions. According to the 2023-24 assessment pattern, at least one diagram question from this chapter appears in Section B. The chapter sits within the larger 'Nutrition in Plants and Animals' unit that collectively carries about 12-15 marks. Past five years of board papers show that ruminant digestion and the human digestive system account for nearly 70% of questions from this chapter, making them high-priority topics.
  • 1-mark questions: 2-3 MCQs or fill-in-the-blanks on feeding modes, digestive juice names, tooth types
  • 2-mark questions: 1-2 questions defining terms or listing differences (holozoic vs saprophytic nutrition)
  • 3-mark questions: 1 question explaining a process like peristalsis or ruminant digestion steps
  • 5-mark questions: 1 diagram-based question (digestive system labelling) or case-based application
  • Diagrams carry 40% weightage: human digestive system, Amoeba nutrition, tooth structure are standard asks

1-Mark Questions: MCQs and Very Short Answers

These rapid-fire questions test recall of definitions, one-word answers, and quick concept checks. CBSE typically includes 2-3 such questions from this chapter across objective sections. Students should answer in one word, one phrase, or one sentence maximum. Marks are lost when students over-explain or use incorrect NCERT terminology. Always use the exact term from the textbook—for example, write 'holozoic nutrition' not 'animal-type nutrition'. Time management is crucial: spend no more than 30 seconds per 1-mark question during the exam.

2-Mark Questions: Short Answer Type

Two-mark questions demand brief explanations, two-point answers, or simple comparisons. CBSE expects 30-40 words per 2-mark question. The key is structuring your answer in two clear points or sentences. Avoid single long sentences. Many students lose 0.5 marks by giving only one reason when two are needed or by not using correct scientific terms. For definition-based questions, state the term's meaning first, then give one relevant example. For process questions, mention two sequential steps clearly. Always underline key terms like 'ruminant', 'canine', 'digestion' to signal you know the vocabulary.

3-Mark Questions: Short Answer Type II

Three-mark questions require structured explanations with three distinct points or a coherent paragraph of 50-70 words covering three aspects. CBSE mark schemes allocate 1 mark per valid point, so even if your explanation is good but covers only two points, you lose 1 mark. Use numbered points or bullet format for clarity. Process-based questions are common here: explain digestion in the stomach, describe how Amoeba feeds, outline the path of food through the digestive system. Always start with a topic sentence, then develop three supporting facts. Include at least one technical term per point to demonstrate understanding. Diagrams do not fetch extra marks in 3-mark written questions unless the question explicitly asks for a labelled diagram.

5-Mark Questions: Long Answer and Case-Based

Five-mark questions are the foundation of scoring high in CBSE Class 7 Science. They appear as diagram-based questions, detailed process explanations, or case-study scenarios linking real-world observations to chapter concepts. CBSE allocates roughly 2-3 marks for the diagram (neat drawing, correct labels, proper title) and the remaining marks for written explanation. For pure descriptive questions, write 100-120 words organized in 4-5 logical points. Always start with a definition or overview sentence. Use subheadings if explaining multiple organs or steps. Case-based questions present a short paragraph describing a situation—read it twice, underline keywords, then answer sub-questions that test application of chapter concepts. These questions separate average students from high scorers.
  • Diagram protocol: Use pencil, draw in the centre, label with ruler-drawn lines, write labels horizontally
  • Written answers: Introduction sentence + 4 body points + concluding line (optional but adds coherence)
  • Time allocation: Spend 7-8 minutes on a 5-mark question; plan 1 minute, write 6 minutes, review 1 minute
  • Mark distribution awareness: If question says 'draw AND explain', typically 3 marks diagram + 2 marks explanation

More 5-Mark Case-Based and Application Questions

Case-based questions simulate real-world scenarios, testing whether students can apply textbook knowledge beyond rote learning. A typical case presents a 40-50 word description followed by 2-3 sub-questions totalling 5 marks. Recent CBSE papers include cases on animal feeding habits, farmer observations of cattle digestion, or comparing human and animal teeth. Read the case carefully, identify which chapter concept it links to, then answer precisely. Do not rewrite the case in your answer. Sub-questions may be 1+2+2 marks or 2+3 marks split. Answer each sub-part separately and clearly label them (i), (ii), (iii). These questions reward students who have understood the 'why' and 'how', not just memorised definitions.

Additional Important 3-Mark and 5-Mark Questions

Here are more high-value questions that have appeared in CBSE and various school exams over the past three years. Practise writing these under timed conditions—set a timer for 6 minutes for 3-mark and 8 minutes for 5-mark questions. Compare your answers with the model answers below. Notice how model answers use bullet points, scientific terms, and clear sequencing. If a question asks to 'explain', always give reasons or mechanisms, not just definitions. If it says 'describe', provide step-by-step detail. If it says 'draw and label', the diagram must be clean and labels must match NCERT terminology exactly.

How CBSE Frames Questions from This Chapter

Understanding CBSE question patterns helps you prepare strategically. The board follows a predictable formula for Nutrition in Animals. Diagram questions almost always ask for the human digestive system or Amoeba's nutrition process; less frequently, tooth structure appears. Process explanations focus on mechanical digestion (chewing, peristalsis) or chemical digestion (enzyme action). Comparison questions pair feeding modes (holozoic vs parasitic) or animal types (ruminant vs non-ruminant). Definition questions target terms like egestion, assimilation, villi, rumen, canines. CBSE loves real-world application: 'Why do we feel hungry?', 'What happens if villi are damaged?', 'How does a snake swallow large prey?' Recent papers show 15-20% weightage on HOTS (Higher Order Thinking Skills) where students must analyse or apply knowledge, not just recall. The board avoids trick questions but penalises vague answers—specificity and correct terminology are rewarded.
  • Diagram-based: 40% of chapter marks; always practice drawing digestive system, Amoeba, tooth cross-section
  • Process/explanation: 35% of marks; focus on step-by-step mechanisms with proper sequence words (first, then, finally)
  • Differentiation/comparison: 15% of marks; make two-column answers or use 'whereas' to show contrast clearly
  • Definition and one-word: 10% of marks; memorise exact NCERT glossary definitions, use them verbatim
  • Application/HOTS: Growing trend, now ~10-15% in periodic tests; practice 'what if' and 'why' scenario questions

Common Mistakes Students Make and How to Avoid Them

Even well-prepared students lose 2-3 marks in this chapter due to recurring errors. The most frequent mistake is confusing villi with cilia—villi are in the intestine for absorption; cilia are hair-like structures in the respiratory tract. Students often mix up digestive juices: remember stomach secretes gastric juice (contains HCl and pepsin), liver produces bile (not a juice with enzymes, but an emulsifier), pancreas releases pancreatic juice (multiple enzymes). In ruminant questions, many write three stomach parts instead of four or get the sequence wrong—always write Rumen, Reticulum, Omasum, Abomasum in order. Diagram errors include mislabelling the oesophagus as 'food pipe' (use scientific term), drawing the liver on the wrong side, or forgetting to show the gall bladder. In definitions, students write 'eating' instead of 'ingestion' or 'throwing out' instead of 'egestion'—use only NCERT terms. Lastly, many lose marks by not underlining scientific terms or by giving incomplete answers to 2-mark questions (one point instead of two).
  • Villi vs cilia confusion: Villi = intestine absorption; Cilia = respiratory tract cleaning (not in this chapter)
  • Digestive juice mix-up: Stomach = gastric juice; Liver = bile (no enzymes); Pancreas = pancreatic juice; Salivary glands = saliva
  • Ruminant stomach error: Must name all four chambers in sequence, not just 'rumen' and 'stomach'
  • Diagram inaccuracies: Liver is on the right side of the body (left in diagram as we face it), gall bladder attached below liver
  • Terminology slips: Use ingestion/digestion/absorption/assimilation/egestion, not casual words like eating/breaking/taking in/removing
  • Incomplete answers: A 2-mark question needs TWO points; a 3-mark needs THREE points—count your points before moving on
  • Spelling mistakes: Oesophagus (not esophagus in CBSE), Amoeba (capital A, not amoeba), ruminant (not ruminent)

Diagram Practice: Step-by-Step Drawing Guide

Diagrams can make or break your score in this chapter. CBSE awards up to 3 marks for a well-drawn, neatly labelled diagram. Start by drawing the outline lightly in pencil, then darken it. For the human digestive system, draw a vertical alimentary canal starting with the mouth at the top and ending with the anus at the bottom. Show the stomach as a J-shaped sac on the left side, the liver as a large triangular organ on the right, and the small intestine as a coiled tube. The large intestine frames the small intestine. Use a ruler for label lines—never freehand. Labels must be written horizontally, not at angles, and should point exactly to the part being labelled. Write a title above or below: 'Human Digestive System'. For Amoeba, draw an irregular blob with a nucleus, food vacuole, and pseudopodia extending out to engulf a food particle. For tooth structure, draw a vertical cross-section showing enamel (outermost), dentine (middle layer), pulp cavity (centre with nerves and blood vessels), and root embedded in gum.
  • Use only pencil for diagrams; pen is penalised in many schools for biology diagrams
  • Label at least 6 parts to earn full marks; fewer labels = proportional mark deduction
  • Draw in the centre of the answer space, leaving margins; cramped diagrams look messy
  • Avoid shading or colouring unless the question specifically asks for it
  • Practice the same diagram 5 times before the exam so you can draw it quickly and accurately under pressure

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  • Instant photo-upload doubt solving: snap your NCERT question or worksheet, get worked solutions in under a minute
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Revision Strategy for Maximum Marks

With three weeks before exams, dedicate two focused revision sessions to this chapter. In the first session, rewrite all NCERT 'Think and Answer' questions from your own memory, then cross-check with the textbook. Identify gaps and make a one-page cheat-sheet of only the points you forget—typically enzyme names, ruminant chamber sequence, and tooth types. In the second session, draw all three major diagrams (digestive system, Amoeba, tooth) twice each on blank paper without reference, then verify. Time yourself: you should complete the digestive system diagram with labels in under 4 minutes by exam day. One week before exams, solve the previous year's question paper for this chapter under timed conditions. Mark your own paper strictly using the CBSE marking scheme available on cbse.nic.in. Focus your last revision on any question you scored below 60% on. On the day before the exam, read only your one-page cheat-sheet and practice writing any one 5-mark answer to reinforce structure and flow. Avoid learning new facts at this stage; consolidate what you already know.
  • Week 3 before exam: Read chapter once, make notes of all bold terms and processes
  • Week 2 before exam: Solve all NCERT in-text and end-of-chapter questions; practice diagrams daily
  • Week 1 before exam: Attempt previous year paper + sample paper; identify weak areas and revise
  • Day before exam: Quick revision of definitions, diagrams, and your personal mistake list; avoid new topics
  • Morning of exam: Glance at diagram label checklist and process flowcharts (digestion steps, Amoeba feeding)

Frequently asked questions

How many marks does Chapter 2 Nutrition in Animals carry in the CBSE Class 7 annual exam?+
This chapter typically carries 5-7 marks in the annual exam, distributed across 1-mark MCQs, 2-3 mark short answers, and one 5-mark diagram or long-answer question. Combined with Chapter 1 Nutrition in Plants, the entire Nutrition unit contributes approximately 12-15 marks to the 80-mark Science theory paper.
Which diagram is most important for CBSE exams from this chapter?+
The human digestive system diagram is the highest-priority diagram, appearing in 70% of CBSE papers. Students must label mouth, oesophagus, stomach, liver, gall bladder, pancreas, small intestine, large intestine, and anus. Amoeba nutrition and tooth structure diagrams also appear occasionally, so practice all three to be fully prepared.
What is the difference between digestion and absorption?+
Digestion is the breakdown of complex food molecules into simpler, soluble forms using mechanical and chemical processes (chewing, enzyme action). Absorption is the process by which digested nutrients pass through the intestinal wall into the bloodstream. Digestion occurs mainly in the stomach and small intestine, while absorption happens primarily in the small intestine via villi.
Why do ruminants like cows chew cud, and how should I explain this in exams?+
Ruminants chew cud because grass contains cellulose, which is very difficult to digest. After initial swallowing, food enters the rumen where bacteria partially break it down. The semi-digested food (cud) returns to the mouth for re-chewing, increasing surface area for bacterial action. In exams, mention the four stomach chambers (rumen, reticulum, omasum, abomasum) and explain that this process ensures maximum nutrient extraction from plant material.
How can I remember the four types of teeth and their functions?+
Use the mnemonic 'I Can Pre-chew My Meal': Incisors (I) Cut and bite; Canines (Can) Tear meat; Premolars (Pre-chew) and Molars (My Meal) Chew and grind. In humans, there are 8 incisors, 4 canines, 8 premolars, and 12 molars, totalling 32 permanent teeth. Write this in point form in exams for clarity and full marks.
What is the function of villi, and why do questions on villi carry 2-3 marks?+
Villi are finger-like projections on the inner wall of the small intestine that increase surface area for nutrient absorption. Each villus contains blood capillaries and lacteals that absorb digested food into the bloodstream. CBSE awards marks for explaining both structure (tiny projections, millions present) and function (increased surface area, absorption of glucose and amino acids). Mention that villi make absorption highly efficient.
What are common mistakes students make while drawing the digestive system diagram?+
Common errors include mislabelling the oesophagus as 'food pipe' instead of using the scientific term, drawing the liver on the wrong side, forgetting the gall bladder, not showing the small intestine as coiled, and writing labels at angles instead of horizontally. Students also lose marks for untidy diagrams drawn without a ruler for label lines. Practice 5 times before the exam to avoid these mistakes.
How is nutrition in Amoeba different from human nutrition?+
Amoeba is a unicellular organism that uses pseudopodia (false feet) to engulf food particles in a process called phagocytosis. Food is digested in food vacuoles within the cell. Humans are multicellular with a specialised digestive system involving multiple organs and a long alimentary canal. Both follow holozoic nutrition but differ in complexity. In 3-mark questions, describe Amoeba's ingestion, digestion, absorption, and egestion steps clearly.
Can CBSETUTOR.ai help with diagram practice for this chapter?+
Yes. Students can draw the digestive system, Amoeba, or tooth diagram, take a photo, and upload it to CBSETUTOR.ai. The AI tutor will check labelling accuracy, suggest corrections, and provide tips for neater presentation. It is especially useful for self-study students who do not have a teacher to review their diagram practice. The 3-day free trial lets you test this feature at no cost.
What is the best way to prepare 5-mark questions for this chapter?+
For 5-mark questions, practice writing 100-120 word answers in 4-5 clear points. Focus on diagram-based questions (human digestive system with explanation of one organ like liver or villi) and case-based scenarios. Time yourself: spend no more than 7 minutes per 5-mark question. Use bullet points for clarity, underline scientific terms, and always include an introductory sentence. Review the CBSE marking scheme to understand how marks are distributed between diagram and explanation.

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