CBSE Class 7 Science Chapter 10 Life Processes In Plants MCQs Set 02

Download CBSE MCQs for Class 7 Science: Chapter 10 Life Processes In Plants

Review structured MCQ sets for Class 7 Science Chapter 10 Life Processes In Plants. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Chapter-wise Objective Questions: Chapter 10 Life Processes In Plants

Access the complete set of multiple-choice questions for Chapter 10 Life Processes In Plants below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

Question: When a plant in Pot C is kept in complete darkness with adequate water for two weeks, how does its growth compare to the plant in Pot A kept in sunlight with water?
A. The plant in Pot C grows taller than Pot A because water is more important than sunlight
B. The plant in Pot C shows significantly less growth with yellowed leaves, whereas Pot A shows healthy green growth
C. Both plants grow identically since they receive the same amount of water
D. The plant in Pot C grows faster because darkness prevents water loss
Show Answer & Explanation

Answer: (B) The plant in Pot C shows significantly less growth with yellowed leaves, whereas Pot A shows healthy green growth

Explanation:
Activity 10.1 demonstrates that adequate sunlight is as essential as water for healthy plant growth. Without sunlight, leaves become yellowish and growth is stunted. Pot A, receiving both sunlight and water, grows robustly with green leaves, while Pot C experiences reduced growth and leaf discoloration despite having sufficient water.

Question: In Activity 10.3, Bhaskar observed that the green patches of a leaf from a sunlit plant turned blue-black with iodine, but the non-green patches did not. What does this observation most directly indicate?
A. Non-green patches contain more water than green patches
B. Chlorophyll is necessary for the synthesis of starch in the presence of sunlight
C. Non-green patches have no access to sunlight
D. Starch is present in all parts of the leaf regardless of colour
Show Answer & Explanation

Answer: (B) Chlorophyll is necessary for the synthesis of starch in the presence of sunlight

Explanation:
The blue-black colour indicates starch presence. Since only green patches (containing chlorophyll) showed starch, the experiment reveals that chlorophyll is essential for food preparation. Non-green patches lack sufficient chlorophyll to produce detectable amounts of starch, even when other conditions are favourable.

Question: What would happen to a leaf if sodium hydroxide inside a bottle absorbed all the carbon dioxide around half of the leaf during Activity 10.4?
A. Both halves of the leaf would show equal starch production
B. Only the half exposed to air would show starch after the iodine test
C. The half inside the bottle would produce more starch
D. Neither half would produce starch because light was blocked
Show Answer & Explanation

Answer: (B) Only the half exposed to air would show starch after the iodine test

Explanation:
The caustic soda removes carbon dioxide from the enclosed space. Since carbon dioxide is essential for starch synthesis, the leaf half inside the bottle lacks this raw material and cannot produce starch. The half outside the bottle retains access to atmospheric carbon dioxide and produces starch normally.

Question: In Activity 10.5, Barkha didi inserted a lit matchstick into gas collected above a water plant in sunlight. The matchstick burned with an intense flame. This indicates the collected gas is primarily which substance?
A. Carbon dioxide, which supports combustion
B. Oxygen, which supports and intensifies combustion
C. Nitrogen, which extinguishes flames
D. Hydrogen, which produces a popping sound
Show Answer & Explanation

Answer: (B) Oxygen, which supports and intensifies combustion

Explanation:
Oxygen supports combustion and causes flames to burn more brightly. The intense flame produced when the matchstick was inserted demonstrates that the accumulated gas is rich in oxygen, confirming that oxygen is released during photosynthesis.

Question: Leaves are called 'food factories' of plants. Which statement best justifies this description?
A. Leaves store all the food produced by other parts of the plant
B. Leaves are the primary sites where glucose is synthesised using sunlight, water, and carbon dioxide
C. Leaves distribute nutrients to all other plant parts through the phloem
D. Leaves are the only organs that contain chlorophyll in plants
Show Answer & Explanation

Answer: (B) Leaves are the primary sites where glucose is synthesised using sunlight, water, and carbon dioxide

Explanation:
Leaves are described as food factories because they are the main organs where photosynthesis occurs. Using chlorophyll to capture sunlight, they convert carbon dioxide and water into glucose and oxygen. This production of food distinguishes leaves as the manufacturing centres of plants.

Question: Based on the word equation for photosynthesis, which pair correctly identifies one raw material and one product?
A. Water is a raw material; carbon dioxide is a product
B. Chlorophyll is a raw material; glucose is a product
C. Sunlight is a raw material; starch is a product
D. Oxygen is a raw material; water is a product
Show Answer & Explanation

Answer: (C) Sunlight is a raw material; starch is a product

Explanation:
• Sunlight is listed as a necessary condition (alongside chlorophyll) for the reaction to proceed, functioning as a raw material
• The equation shows: Carbon dioxide + Water → Glucose + Oxygen (with sunlight and chlorophyll)
• Glucose is initially produced and later converted to starch for storage, making starch an end product of the overall process.

Question: When Bhaskar kept a potted plant in the dark for 36 hours before conducting Activity 10.3, what was the primary purpose of this step?
A. To kill all the chlorophyll so non-green patches would be visible
B. To allow the plant to destarch, removing any previously stored starch from the leaves
C. To prevent the plant from producing new oxygen during the experiment
D. To ensure the plant would not absorb any water from the soil
Show Answer & Explanation

Answer: (B) To allow the plant to destarch, removing any previously stored starch from the leaves

Explanation:
Keeping the plant in darkness prevents photosynthesis from occurring, allowing existing starch to be broken down and used for respiration. This destarching ensures that any starch detected afterward is newly produced during the actual experiment, making the results clear and reliable.

Question: What is the relationship between the locations of xylem and phloem tissues in a plant stem, based on Activity 10.7?
A. Xylem surrounds the phloem completely
B. Phloem and xylem are located in the same tissue with no distinction
C. Xylem and phloem are separate tube-like structures that run parallel through the stem
D. Phloem is only present in leaves while xylem runs through the stem
Show Answer & Explanation

Answer: (C) Xylem and phloem are separate tube-like structures that run parallel through the stem

Explanation:
When the stem was cut and examined under magnification in Activity 10.7, the red dye showed xylem's location. Xylem transports water and minerals upward, while phloem transports food downward from leaves. Both exist as distinct vascular tissues within stems and branches.

Question: In Activity 10.2, why is alcohol used to extract chlorophyll from the leaf rather than water?
A. Water would dissolve the leaf tissue entirely
B. Alcohol is a solvent that effectively removes the green pigment, allowing colour changes from iodine to be visible
C. Water would cause the starch to break down before testing
D. Alcohol kills bacteria that might interfere with the test
Show Answer & Explanation

Answer: (B) Alcohol is a solvent that effectively removes the green pigment, allowing colour changes from iodine to be visible

Explanation:
Alcohol dissolves chlorophyll without destroying the leaf structure. By removing the green colour, a colour change from iodine becomes easily observable. This decolorisation is essential for detecting the blue-black colour that indicates starch presence.

Question: How do the processes of photosynthesis and respiration differ in their relationship to oxygen?
A. Photosynthesis produces oxygen while respiration produces carbon dioxide
B. Both processes consume oxygen at the same rate
C. Photosynthesis consumes oxygen; respiration produces it
D. Neither process involves oxygen directly
Show Answer & Explanation

Answer: (A) Photosynthesis produces oxygen while respiration produces carbon dioxide

Explanation:
Photosynthesis uses carbon dioxide and produces oxygen. During respiration, plants use oxygen and release carbon dioxide. These opposite relationships mean photosynthesis generates the oxygen that plants need for respiration, demonstrating how the two processes are complementary.

Question: If a plant were placed in an environment with plenty of water and sunlight but no access to atmospheric carbon dioxide, what would be the most likely outcome?
A. The plant would still produce normal amounts of starch
B. Photosynthesis would be inhibited and starch production would cease or be greatly reduced
C. The plant would produce starch using carbon dioxide from respiration instead
D. Stomata would close to conserve carbon dioxide
Show Answer & Explanation

Answer: (B) Photosynthesis would be inhibited and starch production would cease or be greatly reduced

Explanation:
Activity 10.4 demonstrates that carbon dioxide is essential for starch synthesis. Without this raw material, even with optimal light and water, the photosynthetic process cannot occur, preventing glucose and starch formation regardless of other favourable conditions.

Question: In Activity 10.8, lime water turned milky in the test tube connected to the flask containing respiring seeds. What does this colour change specifically indicate?
A. The seeds absorbed oxygen from the surrounding air
B. Carbon dioxide was produced by the respiring seeds in amounts greater than naturally present in air
C. The lime water had gone bad and needed replacing
D. Moisture from the seeds caused a chemical reaction in the lime water
Show Answer & Explanation

Answer: (B) Carbon dioxide was produced by the respiring seeds in amounts greater than naturally present in air

Explanation:
Lime water turns milky when exposed to increased carbon dioxide. Normal air contains only small amounts of carbon dioxide. The milky appearance in the test tube connected to the seed flask indicates that seeds produced extra carbon dioxide through respiration—more than would be present naturally.

Question: Based on the stomata structure shown in Activity 10.6, how do these tiny pores support the process of photosynthesis?
A. Stomata absorb light energy from the sun
B. Stomata allow carbon dioxide to enter the leaf and permit oxygen to exit
C. Stomata transport water from the roots to the leaves
D. Stomata store glucose produced during photosynthesis
Show Answer & Explanation

Answer: (B) Stomata allow carbon dioxide to enter the leaf and permit oxygen to exit

Explanation:
Stomata are the primary entry and exit points for gases in leaves. By allowing atmospheric carbon dioxide to diffuse into the leaf, stomata supply the raw material needed for photosynthesis. They also permit the oxygen byproduct to exit the leaf.

Question: Which statement best explains why plants with non-green leaves, such as those mentioned in the Fascinating Facts section, can still perform photosynthesis?
A. These plants do not perform photosynthesis and rely on absorbed nutrients instead
B. Red, violet, or brown pigments can absorb light energy and assist chlorophyll in photosynthesis
C. These plants store starch in their coloured leaves instead of green ones
D. The coloured pigments replace chlorophyll entirely and work more efficiently
Show Answer & Explanation

Answer: (B) Red, violet, or brown pigments can absorb light energy and assist chlorophyll in photosynthesis

Explanation:
Red, violet, and brown leaves contain additional coloured pigments alongside chlorophyll. Some of these pigments also absorb light and contribute to photosynthesis. An iodine test on such leaves confirms starch presence, demonstrating that photosynthesis does occur despite the absence of visible green colour.

Question: In the word equation for respiration, glucose is broken down to release energy. What distinguishes plant respiration from photosynthesis in terms of which organisms perform each process?
A. Only plants perform photosynthesis; only animals perform respiration
B. All plants perform photosynthesis and respiration; animals perform only respiration
C. Photosynthesis occurs only in roots; respiration occurs only in leaves
D. Only green plant parts perform respiration; non-green parts do not
Show Answer & Explanation

Answer: (B) All plants perform photosynthesis and respiration; animals perform only respiration

Explanation:
All parts of a plant—green or non-green—carry out respiration to obtain energy for growth. Photosynthesis, however, occurs only in green parts containing chlorophyll. Animals cannot photosynthesize but do respire. This makes respiration universal to all organisms while photosynthesis is unique to plants and certain organisms with chlorophyll.

Question: In Activity 10.1, when comparing the three pots after two weeks, which combination of conditions resulted in the best plant growth?
A. Pot A with sunlight and water
B. Pot B with sunlight but no water
C. Pot C in darkness with water
D. Equal growth in all three pots
Show Answer & Explanation

Answer: (A) Pot A with sunlight and water

Explanation:
The experiment clearly demonstrated that the plant in Pot A, receiving both adequate sunlight and water, showed superior growth compared to the other two conditions, establishing that both factors are necessary for optimal plant development.

Question: Which structural feature of leaves, as discussed in section 10.2.1, enables them to function as 'food factories' for plants?
A. Their waxy outer coating
B. Their broad, flat structure with chlorophyll pigment
C. Their network of thick veins
D. Their ability to fold and unfold
Show Answer & Explanation

Answer: (B) Their broad, flat structure with chlorophyll pigment

Explanation:
Leaves are broad and flat by design, allowing them to capture sunlight efficiently, and they contain chlorophyll, the green pigment essential for photosynthesis and food production.

Question: According to the word equation for photosynthesis presented in section 10.2.3, what are the two products formed when carbon dioxide and water are processed in the presence of sunlight and chlorophyll?
A. Starch and oxygen
B. Glucose and oxygen
C. Glucose and carbon dioxide
D. Starch and water
Show Answer & Explanation

Answer: (B) Glucose and oxygen

Explanation:
The equation shows: Carbon dioxide + Water → Glucose + Oxygen (with sunlight and chlorophyll). Glucose is the initial carbohydrate product that may later be converted to starch for storage.

Question: In the respiration process described in section 10.4, what is the fate of the energy released when glucose is broken down?
A. It is stored as starch in the roots
B. It is used by plants for growth and development
C. It is converted entirely to oxygen gas
D. It is released as heat only
Show Answer & Explanation

Answer: (B) It is used by plants for growth and development

Explanation:
During respiration, glucose is broken down to release carbon dioxide, water, and energy, with the energy produced being used by plants for their growth, development, and various life processes.

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Multiple Choice Questions (MCQs) for Class 7 Science Chapter 10 Life Processes In Plants

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