Important Questions: CBSE Class 7 Science Chapter 1 Nutrition in Plants

Nutrition in Plants is Chapter 1 in the NCERT Class 7 Science textbook and usually carries 8-10 marks in term examinations. The chapter is divided into four core topics: autotrophic and heterotrophic nutrition, the process of photosynthesis, saprotrophs and parasites, and symbiotic relationships. In CBSE school exams, photosynthesis receives the highest weightage with 3-5 mark descriptive questions appearing almost every year. Definitions of autotrophs and heterotrophs are standard 1-mark or 2-mark questions. Application-based questions on insectivorous plants (pitcher plant, Venus flytrap) and symbiosis (lichens, rhizobium) are increasingly common in 3-mark and 5-mark formats. Diagram-based questions — labelling a leaf cross-section showing chloroplasts or stomata — also appear regularly. The 2025 CBSE syllabus retains all four topics, so students must prepare definitions, processes, examples, and diagrams thoroughly.

One-mark questions test factual recall and definitions. CBSE Class 7 Science Chapter 1 MCQs focus on identifying autotrophs, naming the green pigment in leaves, or recognising examples of parasites and saprotrophs. Very short answer questions ask for one-word or one-sentence responses, such as naming the tiny pores on leaf surfaces or stating the end products of photosynthesis. These questions are scoring if you know NCERT terminology exactly. In periodic tests and term exams, expect 3-4 one-mark questions from this chapter. Revision tip: memorise the NCERT glossary terms — chlorophyll, stomata, autotroph, heterotroph, saprotroph, parasite, host, symbiosis. Practice matching examples to modes of nutrition, as this is a favourite MCQ format in CBSE papers.

Two-mark questions require short definitions or two-point explanations. CBSE examiners often ask students to differentiate between two concepts (autotrophs vs heterotrophs, parasites vs saprotrophs) or to explain a single process in two sentences. Answers must be precise and use NCERT terminology. For example, when asked to define autotrophic nutrition, mention that organisms synthesise their own food from simple inorganic substances using sunlight — do not write vague statements like 'plants make their own food'. Similarly, when explaining the role of chlorophyll, state that it absorbs sunlight energy required for photosynthesis. Two-mark questions are scoring but require exact wording to secure full marks. Practice writing crisp two-line answers and underline keywords like 'synthesise', 'inorganic substances', 'sunlight', and 'chlorophyll'.

Three-mark questions test understanding and application. CBSE Class 7 Science Chapter 1 commonly includes questions like 'Explain how photosynthesis occurs in plants' or 'Describe the role of stomata in leaves'. A complete 3-mark answer typically has three distinct points or a structured explanation with examples. Use bullet points or numbered steps to organise your answer. For photosynthesis, mention (1) raw materials (CO₂ and water), (2) the role of chlorophyll and sunlight, and (3) products (glucose and oxygen). For stomata, explain (1) location (lower surface of leaves), (2) function (gas exchange — intake of CO₂ and release of O₂), and (3) water loss through transpiration. Always include an example or diagram reference if the question allows. Examiners award partial marks for incomplete answers, so even if you forget one point, write the rest clearly.

Five-mark questions are long-answer type and often include multiple sub-parts or case studies. CBSE Class 7 Science Chapter 1 typically features questions like 'Describe photosynthesis in detail with a labelled diagram' or 'Explain different modes of heterotrophic nutrition with examples'. A complete 5-mark answer should have five distinct points or a structured explanation covering definition, process, examples, and a diagram. Case-based questions present a short paragraph (e.g., a description of how lichens survive on rocks) followed by 3-4 sub-questions worth 1-2 marks each. Read the case carefully and answer each sub-question using information from both the case and your chapter knowledge. Always draw neat, labelled diagrams when asked — in a leaf structure diagram, label chloroplasts, stomata, guard cells, and veins. Examiners award 1-2 marks for a well-labelled diagram, even if the written portion is slightly incomplete.

CBSE examiners use specific patterns when setting questions for Class 7 Science Chapter 1. Definition-based questions (autotroph, heterotroph, photosynthesis) are standard in 1-2 mark slots. Process-based questions ask students to explain photosynthesis step-by-step, often requiring the chemical equation. Application and reasoning questions test real-world understanding: 'Why do farmers grow leguminous crops in rotation?' (Answer: rhizobium bacteria in root nodules fix nitrogen, enriching soil). Diagram-based questions may ask students to draw and label a leaf cross-section or a pitcher plant. Differentiation questions appear frequently: 'Distinguish between parasites and saprotrophs' or 'Compare autotrophic and heterotrophic nutrition'. Case-based questions present a scenario (e.g., a plant growing without soil in water with nutrients) and ask sub-questions on hydroponics or essential minerals. Recent CBSE trends show more competency-focused questions that link nutrition to food chains, ecosystem roles, and agricultural practices.

Many Class 7 students lose marks in Chapter 1 due to preventable errors. The most common mistake is writing an incomplete photosynthesis equation — students often omit 'in the presence of sunlight and chlorophyll' or forget to balance the equation (6CO₂ + 6H₂O, not just CO₂ + H₂O). Another frequent error is confusing parasites with saprotrophs: remember, parasites feed on living hosts (Cuscuta, lice), while saprotrophs feed on dead matter (fungi, bacteria). Students sometimes write that insectivorous plants do not perform photosynthesis — this is wrong; they are green and do photosynthesise but trap insects for additional nitrogen. In diagram questions, labelling errors are common: writing 'pores' instead of 'stomata' or 'green colour' instead of 'chlorophyll'. When asked to differentiate, many students write paragraphs instead of a clear two-column table. Finally, vague answers like 'plants make food' score zero; always use precise terms like 'synthesise glucose from CO₂ and water using sunlight energy in the presence of chlorophyll'.

In a typical CBSE Class 7 Science term exam (80 marks, 3 hours), Chapter 1 Nutrition in Plants contributes 8-10 marks. Allocate time proportionally: spend 1 minute on each 1-mark MCQ, 2-3 minutes on 2-mark questions, 4-5 minutes on 3-mark questions, and 8-10 minutes on 5-mark questions. Start with MCQs and VSA to build confidence and secure easy marks. For descriptive answers, always underline keywords (autotrophic, chlorophyll, stomata, symbiosis) — this signals the examiner that you know NCERT terminology. Use bullet points or numbered steps for process-based questions; this makes your answer easier to evaluate and reduces chances of missing a point. Draw diagrams in pencil first, then trace in pen; label neatly with arrow lines, not random scribbles. For case-based questions, read the passage twice and underline key facts before answering sub-questions. Revise one day before the exam by solving previous-year question papers and sample papers from CBSE or your school. If short on time, prioritise high-weightage topics like photosynthesis and modes of heterotrophic nutrition.

Many students struggle with diagram-based questions or find it hard to remember the photosynthesis equation and modes of nutrition. CBSETUTOR.ai offers a 24×7 AI tutor that answers Chapter 1 doubts instantly via photo upload or text chat. Imagine you are stuck on a question like 'Explain symbiosis with examples' at 10 p.m. the night before the exam — simply snap a photo, upload it, and get a step-by-step NCERT-aligned explanation in seconds. The platform covers all CBSE classes 6-12 at a single flat fee of ₹999 per month, making it far more affordable than local coaching centres that charge ₹3,000-5,000 monthly. Students in cities without access to quality Science tutors find CBSETUTOR.ai especially valuable. The AI tutor explains autotrophic vs heterotrophic nutrition using flowcharts, provides mnemonic tricks to remember parasite examples (Cuscuta, lice, ticks), and even generates custom question banks filtered by marks. You get a 3-day free trial — enough to test it with Chapter 1 before committing. Thousands of CBSE students across India now rely on CBSETUTOR.ai for last-minute revision, homework help, and exam preparation.