CBSE Class 7 Science Chapter 10 Life Processes In Plants MCQs Set 01

Multiple Choice Questions (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.

Practice Chapter 10 Life Processes In Plants MCQs for Class 7 Science

Navigate directly to the 50 objective questions for Chapter 10 Life Processes In Plants using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Question: When a plant is kept in darkness for several days without water, what happens to its ability to synthesise food?
A. It continues to produce starch normally because chlorophyll is always present
B. It loses the ability to produce starch because both sunlight and water are essential for photosynthesis
C. It produces starch only if the temperature remains constant
D. It produces more starch to compensate for the lack of light
Show Answer & Explanation

Answer: (B) It loses the ability to produce starch because both sunlight and water are essential for photosynthesis

Explanation:
Photosynthesis requires both sunlight and water alongside carbon dioxide and chlorophyll. Without either of these factors, the plant cannot synthesise starch, as demonstrated in Activity 10.1 where the plant without water died despite receiving sunlight, and the plant in darkness without sunlight showed stunted growth.

Question: In Activity 10.2, why was it necessary to decolourise the leaf before testing it with iodine solution?
A. To remove chlorophyll so the leaf could float better in the test tube
B. To enable clear observation of the blue-black colour that appears when starch is present
C. To prevent the green colour from reacting with iodine
D. To ensure the leaf absorbed the iodine solution completely
Show Answer & Explanation

Answer: (B) To enable clear observation of the blue-black colour that appears when starch is present

Explanation:
Decolorising the leaf removes the green chlorophyll pigment, which would otherwise mask the blue-black colour that develops when iodine reacts with starch. This simple step makes the presence or absence of starch clearly visible.

Question: Based on Activity 10.3, which statement correctly explains why non-green patches of a leaf in sunlight do not turn blue-black during the iodine test?
A. Non-green patches do not receive sunlight
B. Non-green patches lack sufficient chlorophyll to produce detectable amounts of starch
C. Non-green patches are unable to absorb water from the plant
D. Non-green patches contain a different type of carbohydrate
Show Answer & Explanation

Answer: (B) Non-green patches lack sufficient chlorophyll to produce detectable amounts of starch

Explanation:
The chapter explains that non-green patches may not have enough chlorophyll to prepare sufficient starch to be detected by the iodine test, even though some starch synthesis might occur. Chlorophyll is essential for food preparation, and its absence or low concentration limits starch production.

Question: What does the experimental set-up in Activity 10.4 demonstrate about carbon dioxide?
A. Carbon dioxide is toxic to plant leaves
B. Carbon dioxide is essential for the synthesis of starch in photosynthesis
C. Carbon dioxide helps plants absorb water through their roots
D. Carbon dioxide is produced only during respiration, not photosynthesis
Show Answer & Explanation

Answer: (B) Carbon dioxide is essential for the synthesis of starch in photosynthesis

Explanation:
• The caustic soda solution absorbs carbon dioxide from the air
• The part of the leaf inside the bottle (without CO₂) fails to produce starch
• The part of the leaf outside the bottle (with CO₂) successfully produces starch
This clearly shows that carbon dioxide is necessary for starch synthesis.

Question: Which of the following best describes the relationship between photosynthesis and respiration in plants?
A. Photosynthesis produces glucose and oxygen; respiration breaks down glucose to release energy and carbon dioxide
B. Both processes produce glucose and consume oxygen
C. Photosynthesis occurs only in leaves; respiration occurs only in roots
D. Respiration produces starch; photosynthesis uses starch for growth
Show Answer & Explanation

Answer: (A) Photosynthesis produces glucose and oxygen; respiration breaks down glucose to release energy and carbon dioxide

Explanation:
The chapter clearly states that photosynthesis uses carbon dioxide and water in sunlight to produce glucose and oxygen, while respiration breaks down glucose in the presence of oxygen, releasing carbon dioxide, water, and energy. These are complementary processes.

Question: In Activity 10.5, why does the intensity of the flame increase when a lit matchstick is inserted into the gas collected in the inverted test tube?
A. The gas is nitrogen, which supports combustion more efficiently than air
B. The gas is oxygen, which was released during photosynthesis and supports burning
C. The gas is carbon dioxide, which reacts with the matchstick to produce heat
D. The sealed tube creates pressure that intensifies the flame
Show Answer & Explanation

Answer: (B) The gas is oxygen, which was released during photosynthesis and supports burning

Explanation:
Oxygen is released as a byproduct during photosynthesis when sunlight, water, chlorophyll, and carbon dioxide are present. Oxygen is a supporter of combustion, so when concentrated oxygen comes into contact with the burning matchstick, it causes a more intense flame compared to normal air.

Question: What is the primary function of stomata as described in Activity 10.6?
A. To absorb water and minerals from the soil
B. To store glucose and starch in the leaf
C. To exchange gases—carbon dioxide enters and oxygen exits during photosynthesis
D. To conduct photosynthesis independently of other leaf tissues
Show Answer & Explanation

Answer: (C) To exchange gases—carbon dioxide enters and oxygen exits during photosynthesis

Explanation:
Stomata are tiny pores on the leaf surface that enable gas exchange. They allow carbon dioxide to enter the leaf for photosynthesis and permit oxygen produced during photosynthesis to escape, as well as facilitating gas exchange during respiration.

Question: In Activity 10.7, the red ink moved from the stem into the leaves and flowers. Which plant tissue is responsible for this upward movement of water and minerals?
A. Phloem, which transports food
B. Xylem, which transports water and minerals from roots to all parts of the plant
C. Chlorophyll, which absorbs water through the leaf surface
D. Epidermis, which provides structural support for water movement
Show Answer & Explanation

Answer: (B) Xylem, which transports water and minerals from roots to all parts of the plant

Explanation:
The chapter identifies xylem as the thin tube-like structure present in stems, branches, and leaves that transports water and minerals upward from the roots. The red ink in Activity 10.7 visibly demonstrates this upward movement through the xylem tissue.

Question: Where is food synthesised in a plant, and through which tissue is it transported to other plant parts?
A. Food is synthesised in roots and transported through xylem to all parts
B. Food is synthesised in leaves and transported through phloem to all parts of the plant
C. Food is synthesised in stems and transported through both xylem and phloem equally
D. Food is synthesised in flowers and stored in seeds through the phloem
Show Answer & Explanation

Answer: (B) Food is synthesised in leaves and transported through phloem to all parts of the plant

Explanation:
Leaves are called the 'food factories' of plants where photosynthesis occurs and glucose is produced. This food is then transported to all other plant parts—including seeds, roots, and flowers—through the phloem tissue.

Question: During respiration in plants, what is the fate of the energy released when glucose is broken down?
A. The energy is immediately converted to heat and dissipated into the environment
B. The energy is stored as starch for future use
C. The energy is used by plants for their growth, development, and various life processes
D. The energy is used only in the roots to absorb minerals
Show Answer & Explanation

Answer: (C) The energy is used by plants for their growth, development, and various life processes

Explanation:
The chapter states that the energy produced during respiration is used by plants for their growth and development. All parts of a plant—whether green or non-green—carry out respiration to obtain the energy needed for their vital functions.

Question: What would be the most immediate consequence if all photosynthetic organisms on Earth disappeared?
A. Plants would adapt to produce food through respiration alone
B. There would be no glucose production and no oxygen release, disrupting energy and oxygen supply for most life forms
C. Animals would evolve to become photosynthetic
D. Soil minerals would become more concentrated and benefit remaining organisms
Show Answer & Explanation

Answer: (B) There would be no glucose production and no oxygen release, disrupting energy and oxygen supply for most life forms

Explanation:
Since photosynthetic organisms are the primary producers of glucose (food) and oxygen, their disappearance would eliminate these crucial resources. Most other organisms depend directly or indirectly on photosynthesis for energy and oxygen, making this loss catastrophic for life on Earth.

Question: Based on the word equation for photosynthesis given in the chapter, what are the raw materials and products of this process?
A. • Raw materials: glucose and oxygen • Products: carbon dioxide and water
B. • Raw materials: carbon dioxide and water • Products: glucose and oxygen
C. • Raw materials: starch and chlorophyll • Products: glucose and carbon dioxide
D. • Raw materials: sunlight and chlorophyll • Products: water and minerals
Show Answer & Explanation

Answer: (B) • Raw materials: carbon dioxide and water • Products: glucose and oxygen

Explanation:
The chapter provides the equation: Carbon dioxide + Water → Glucose + Oxygen (with sunlight and chlorophyll). This clearly identifies the raw materials taken in by the plant and the products it generates during photosynthesis.

Question: Why do you think plants with red, violet, or brown leaves can still carry out photosynthesis effectively, despite not appearing green?
A. They use a completely different process that does not involve chlorophyll
B. The coloured pigments are in addition to chlorophyll, and some of these pigments also assist in photosynthesis, as mentioned in the Fascinating Facts section
C. Red and brown leaves cannot photosynthesise and rely on food from green leaves
D. The red pigments absorb more light energy than chlorophyll does
Show Answer & Explanation

Answer: (B) The coloured pigments are in addition to chlorophyll, and some of these pigments also assist in photosynthesis, as mentioned in the Fascinating Facts section

Explanation:
The Fascinating Facts section explains that some leaves contain additional coloured pigments (red, violet, brown) that hide the green chlorophyll but do not prevent photosynthesis. Some of these pigments actually help in the photosynthetic process, and iodine tests confirm starch production in such leaves.

Question: In Activity 10.8, how did the researchers determine that carbon dioxide was produced during respiration rather than being simply present in normal air?
A. They compared the cloudiness of lime water in the test tube connected to the flask with that in an unconnected control test tube
B. They measured the volume of gas released from the seeds
C. They observed the colour change in the seeds themselves
D. They calculated the temperature increase in the conical flask
Show Answer & Explanation

Answer: (A) They compared the cloudiness of lime water in the test tube connected to the flask with that in an unconnected control test tube

Explanation:
The experiment involved comparing two test tubes containing lime water. The test tube connected to the flask with respiring seeds showed greater cloudiness (milkiness) than expected from normal air, indicating additional carbon dioxide production. This additional CO₂ comes from the respiration of the germinating seeds.

Question: How do the processes of photosynthesis and respiration work together to maintain balance in nature?
A. Photosynthesis removes all carbon dioxide from the atmosphere while respiration replenishes it
B. Photosynthesis produces glucose and oxygen for organisms to use; respiration breaks down glucose and returns carbon dioxide to the atmosphere for photosynthesis to reuse
C. Respiration occurs only in animals and photosynthesis only in plants, with no overlap or interaction
D. Both processes are independent and do not influence each other or the environment
Show Answer & Explanation

Answer: (B) Photosynthesis produces glucose and oxygen for organisms to use; respiration breaks down glucose and returns carbon dioxide to the atmosphere for photosynthesis to reuse

Explanation:
Photosynthesis and respiration form a complementary cycle. Photosynthesis captures carbon dioxide and produces oxygen and glucose; respiration consumes glucose and oxygen, returning carbon dioxide. This cycle allows continuous cycling of carbon and oxygen through the ecosystem, maintaining a balance necessary for life.

Question: In Activity 10.1, when pot A receives both sunlight and water while pot B receives only sunlight without water, which outcome is most likely based on the chapter's findings?
A. Pot B will grow better because sunlight is the primary factor for plant growth
B. Pot A will show significantly better growth because it has both essential requirements
C. Both pots will grow equally well since sunlight is sufficient for plant development
D. Pot B will eventually grow better once the soil moisture increases naturally
Show Answer & Explanation

Answer: (B) Pot A will show significantly better growth because it has both essential requirements

Explanation:
The activity demonstrated that plants require both sunlight and water for optimal growth. The text explicitly states that the plant in Pot A, kept in direct sunlight with adequate water, grows better than other conditions, while Pot B without water may have died despite receiving sunlight. This shows sunlight alone is insufficient.

Question: What role does chlorophyll play in helping plants prepare starch, based on the observations from Activity 10.3?
A. It absorbs water from the soil and transports it to leaves
B. It captures sunlight energy that is necessary for starch production in green regions of leaves
C. It protects leaves from damage caused by excessive sunlight exposure
D. It converts carbon dioxide directly into glucose without needing any other factors
Show Answer & Explanation

Answer: (B) It captures sunlight energy that is necessary for starch production in green regions of leaves

Explanation:
Activity 10.3 showed that starch formed only in green patches of leaves exposed to sunlight, not in non-green patches. The chapter states that chlorophyll helps in capturing sunlight efficiently and is essential for the preparation of starch. This connection between chlorophyll presence and starch formation in light demonstrates that chlorophyll captures the light energy required for food synthesis.

Question: If a plant leaf is partially covered by an opaque material for 36 hours while the plant remains in sunlight, what would an iodine test reveal about the covered portion of the leaf?
A. The covered area would turn blue-black because chlorophyll is present
B. The covered area would show no colour change because starch cannot form without light reaching the leaf
C. The covered area would be yellow because it has developed a different pigment
D. The covered area would turn light brown regardless of light exposure
Show Answer & Explanation

Answer: (B) The covered area would show no colour change because starch cannot form without light reaching the leaf

Explanation:
Activity 10.3 demonstrated that starch production requires both chlorophyll and sunlight reaching the leaf tissue. When the green patches of a leaf were blocked from sunlight, no starch formed even though chlorophyll was present. Therefore, blocking light would prevent starch synthesis and the iodine test would not show the blue-black colour indicating starch presence.

Question: Which of the following best explains why plants need to absorb carbon dioxide from the air during photosynthesis?
A. Carbon dioxide provides the mineral nutrients required for plant growth
B. Carbon dioxide is used as a raw material along with water to synthesise glucose in the presence of sunlight
C. Carbon dioxide helps chlorophyll absorb more sunlight energy from the environment
D. Carbon dioxide loosens the soil structure around plant roots, allowing better water absorption
Show Answer & Explanation

Answer: (B) Carbon dioxide is used as a raw material along with water to synthesise glucose in the presence of sunlight

Explanation:
Activity 10.4 showed that when carbon dioxide was removed from the air using caustic soda, no starch formed on the covered leaf portion. The chapter's word equation clearly lists carbon dioxide as a raw material: Carbon dioxide + Water → Glucose + Oxygen. This shows carbon dioxide is essential as a starting ingredient, not for other functions.

Question: Based on Activity 10.5, what can you infer about the composition of the gas that was collected in the inverted test tube when the plant was kept in sunlight?
A. • The gas was nitrogen, which is abundant in the atmosphere • It was collected because the water plant absorbed the surrounding air
B. • The gas was oxygen released during photosynthesis • A lit matchstick burned with intense flame when inserted, confirming oxygen's presence
C. • The gas was carbon dioxide that accumulated from plant respiration • It extinguished the matchstick when tested
D. • The gas was a mixture of all atmospheric gases in their normal proportions
Show Answer & Explanation

Answer: (B) • The gas was oxygen released during photosynthesis • A lit matchstick burned with intense flame when inserted, confirming oxygen's presence

Explanation:
The activity explicitly states that when a lit matchstick was inserted into the gas collected in set-up A (placed in sunlight), it produced an intense flame. This is the characteristic test for oxygen's presence. The chapter concludes that oxygen is released during photosynthesis, which explains why bubbles accumulated in the tube under sunlight conditions.

Question: Why might a plant grown entirely in a dark room develop pale or yellowish leaves even if it receives adequate water and minerals from the soil?
A. Darkness causes the roots to stop absorbing minerals from the soil
B. Without sunlight, the plant cannot synthesise starch, and chlorophyll development or maintenance may be affected
C. The soil nutrients decompose faster in darkness, reducing their availability
D. Pale leaves are a natural protective response that helps the plant survive in low-light conditions
Show Answer & Explanation

Answer: (B) Without sunlight, the plant cannot synthesise starch, and chlorophyll development or maintenance may be affected

Explanation:
Activity 10.1 showed that the plant in darkness (Pot C) grew much less than the one in sunlight, and the pale or yellow colour of leaves reflects reduced chlorophyll or starch content. The chapter demonstrates that sunlight is essential for starch synthesis, and without it, the plant's ability to produce food is compromised. This affects overall plant health and leaf colour development.

Question: In Activity 10.7, the red dye travelled through the plant stem to reach the leaves and flowers. What does this experiment primarily demonstrate about plant anatomy?
A. That the phloem tissue carries coloured dyes faster than the xylem
B. That water and dissolved substances move upward through the xylem, a tube-like structure in stems and branches
C. That leaves absorb red dye directly from the air through their stomata
D. That the roots filter out all colours except red before transport
Show Answer & Explanation

Answer: (B) That water and dissolved substances move upward through the xylem, a tube-like structure in stems and branches

Explanation:
The chapter explicitly states that the red dye's upward movement through the stem is due to the xylem, a thin tube-like structure present in stems, branches, and leaves. The text explains that just like red ink, minerals dissolved in water also move up through the xylem. This activity directly illustrates water and mineral transport pathways in plants.

Question: How are phloem and xylem different in their primary functions within a plant?
A. Xylem transports only water, while phloem transports only minerals from soil
B. Xylem transports water and minerals from roots upward, while phloem carries food synthesised in leaves to all plant parts
C. Both tissues transport the same substances but at different speeds depending on temperature
D. Phloem is found only in roots, while xylem is found only in leaves and stems
Show Answer & Explanation

Answer: (B) Xylem transports water and minerals from roots upward, while phloem carries food synthesised in leaves to all plant parts

Explanation:
The chapter clearly distinguishes these two transport systems. Water and minerals from soil are taken up by roots and move to all parts through xylem. Food prepared by plants in leaves is transported to all parts through phloem. Figure 10.8 and the accompanying text explicitly show both tissues and their separate roles in plant transport.

Question: During respiration in plants, which of the following correctly describes what happens to glucose and what is produced?
A. Glucose combines with carbon dioxide to form starch and release water
B. Glucose is broken down in the presence of oxygen to release energy, carbon dioxide, and water
C. Glucose is converted into chlorophyll, which then releases oxygen for use by other parts of the plant
D. Glucose remains stored in plant cells without any chemical changes
Show Answer & Explanation

Answer: (B) Glucose is broken down in the presence of oxygen to release energy, carbon dioxide, and water

Explanation:
The chapter provides the word equation for respiration: Glucose + Oxygen → Carbon dioxide + Water + Energy. Activity 10.8 confirmed this by demonstrating that germinating seeds produced carbon dioxide during respiration, detected by the change in lime water colour. The text explicitly states that during respiration, glucose is broken down in the presence of oxygen, releasing these products.

Question: Based on the chapter's discussion of Vrikshayurveda, what does the ancient text suggest about plant growth that differs from simply planting a seed?
A. Trees produce fruits and flowers automatically once they are planted in soil
B. Trees do not produce fruits and flowers merely because they are planted, indicating that specific conditions and practices are needed for healthy growth
C. Ancient texts contain no useful information about actual plant growth requirements
D. Planting a tree guarantees fruit production within a single season
Show Answer & Explanation

Answer: (B) Trees do not produce fruits and flowers merely because they are planted, indicating that specific conditions and practices are needed for healthy growth

Explanation:
The Fascinating Facts section includes a quote from Vrikshayurveda stating 'Trees do not produce fruits and flowers merely because they are planted.' The text explains that this ancient document recorded observations about plant growth, soil, and agricultural practices, and mentions specific techniques like organic manure preparation. This shows that successful plant growth requires more than just planting—it requires proper conditions and care.

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Chapter 10 Life Processes In Plants Objective Questions & Solutions for Class 7 Science

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Where can I access latest CBSE Class 7 Science Chapter 10 Life Processes In Plants MCQs Set 01?

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