CBSE Class 7 Science Chapter 10 Life Processes In Plants MCQs Set 03

Science Objective Questions and Answers: Chapter 10 Life Processes In Plants

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Question: In Activity 10.1, when pot B received direct sunlight but no water for two weeks, what outcome was most likely observed?
A. The plant grew taller than the plant in pot A
B. The plant died or became severely wilted
C. The plant developed thick, waxy leaves
D. The plant produced more leaves than in pot C
Show Answer & Explanation

Answer: (B) The plant died or became severely wilted

Explanation:
The chapter explicitly states that the plant in pot B may have died as it did not receive water even though it received adequate sunlight. Water is essential for plant survival and growth, and without it, the plant cannot maintain its cellular functions.

Question: What is the primary reason why leaves are mostly green in colour, according to the chapter?
A. Green helps plants absorb more sunlight energy
B. Chlorophyll, a green pigment, is present in leaves and helps capture sunlight efficiently
C. Green colour protects leaves from harmful UV rays
D. Green pigment helps plants store more water in their tissues
Show Answer & Explanation

Answer: (B) Chlorophyll, a green pigment, is present in leaves and helps capture sunlight efficiently

Explanation:
The chapter states that leaves are mostly green because of the presence of a green pigment called chlorophyll that helps in capturing sunlight efficiently. This pigment is essential for the photosynthetic process.

Question: In Activity 10.3, why did the green patches of the leaf from a sunlit plant turn blue-black with iodine, while the non-green patches did not?
A. Non-green patches were dead tissue unable to process any chemicals
B. Green patches contain chlorophyll which produces starch; non-green patches lack sufficient chlorophyll to produce detectable amounts of starch
C. The iodine solution only reacts with green pigments
D. Non-green patches are located on the upper surface of the leaf where iodine cannot reach
Show Answer & Explanation

Answer: (B) Green patches contain chlorophyll which produces starch; non-green patches lack sufficient chlorophyll to produce detectable amounts of starch

Explanation:
• Starch is produced in the presence of chlorophyll
• Green patches contain more chlorophyll to synthesise starch
• Non-green patches lack sufficient chlorophyll, so they produce little to no starch that can be detected by the iodine test

Question: Which gas from the air is essential for plants to prepare food in the form of starch, as demonstrated in Activity 10.4?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Hydrogen
Show Answer & Explanation

Answer: (C) Carbon dioxide

Explanation:
Activity 10.4 shows that when caustic soda absorbs carbon dioxide from the air inside the bottle, the part of the leaf inside the bottle does not produce starch. Only the part outside with access to carbon dioxide turns blue-black in the iodine test, proving that carbon dioxide is essential for food preparation.

Question: Based on Activity 10.5, what can you infer about the gas that accumulated in the inverted test tube when the water plant was exposed to sunlight?
A. It was primarily carbon dioxide because plants absorb this gas
B. It was primarily oxygen because the matchstick burned with an intense flame
C. It was nitrogen released from the soil
D. It was a mixture of all atmospheric gases
Show Answer & Explanation

Answer: (B) It was primarily oxygen because the matchstick burned with an intense flame

Explanation:
When a lit matchstick was inserted into the collected gas, it produced an intense flame. This intense burning indicates the presence of oxygen, which supports combustion. The chapter confirms that oxygen is released during photosynthesis when plants are exposed to sunlight.

Question: How do stomata help plants during photosynthesis, according to Activity 10.6?
A. They absorb water from the air for photosynthesis
B. They allow carbon dioxide to enter the leaf and oxygen to exit
C. They produce chlorophyll to capture sunlight
D. They transport glucose to other parts of the plant
Show Answer & Explanation

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

Explanation:
The chapter states that stomata, which are tiny pores on the leaf surface, help in the exchange of gases. Since photosynthesis requires carbon dioxide and releases oxygen, stomata facilitate the entry of carbon dioxide and exit of oxygen during this process.

Question: In Activity 10.7, the red ink successfully travelled from the tumbler into the leaves and flowers of the plant. Which plant tissue was responsible for this upward transport?
A. Phloem
B. Xylem
C. Epidermis
D. Cork tissue
Show Answer & Explanation

Answer: (B) Xylem

Explanation:
The chapter explains that the red ink moved upward through a thin tube-like structure called the xylem. Just as the red ink traced the path, minerals dissolved in water also move up the stem through the xylem, demonstrating that this tissue is responsible for transporting water and minerals from roots to other parts.

Question: Where is food synthesised in a plant, and through which tissue is it transported to storage organs like potato tubers?
A. Food is synthesised in roots through xylem and transported via phloem
B. Food is synthesised in leaves through photosynthesis and transported via phloem
C. Food is synthesised in stems through respiration and transported via xylem
D. Food is synthesised in flowers and transported via epidermis
Show Answer & Explanation

Answer: (B) Food is synthesised in leaves through photosynthesis and transported via phloem

Explanation:
Leaves are the food factories where photosynthesis occurs. The food synthesised there is transported through the phloem to all parts of the plant, including storage organs like seeds and roots (or potato tubers), where it may be stored for later use.

Question: What is the word equation for respiration in plants, as presented in section 10.4?
A. Carbon dioxide + Water → Glucose + Oxygen
B. Glucose + Oxygen → Carbon dioxide + Water + Energy
C. Glucose + Sunlight → Oxygen + Starch + Water
D. Carbon dioxide + Energy → Glucose + Oxygen
Show Answer & Explanation

Answer: (B) Glucose + Oxygen → Carbon dioxide + Water + Energy

Explanation:
The chapter provides the word equation: Glucose + Oxygen → Carbon dioxide + Water + Energy. This shows that during respiration, glucose is broken down in the presence of oxygen to release carbon dioxide, water, and energy for plant growth and development.

Question: In Activity 10.8, why did the lime water turn milky in the test tube connected to the flask with germinating seeds?
A. The seeds were dissolving in water and releasing minerals
B. The seeds were performing respiration and releasing more carbon dioxide than naturally present in air
C. The lime water was exposed to direct sunlight
D. Bacteria in the flask were producing gases
Show Answer & Explanation

Answer: (B) The seeds were performing respiration and releasing more carbon dioxide than naturally present in air

Explanation:
The chapter explains that carbon dioxide is naturally present in small quantities in air, but the lime water turned milky because additional carbon dioxide was produced by the seeds as they respired. This excess carbon dioxide reacted with lime water, causing it to turn milky.

Question: What would be the most immediate consequence if plants lost the ability to perform photosynthesis?
A. Plants would need to consume food like animals
B. Plants would die, eliminating a primary source of oxygen and food for other organisms
C. Plants would rely entirely on respiration for energy
D. Plants would absorb more minerals from soil to compensate
Show Answer & Explanation

Answer: (B) Plants would die, eliminating a primary source of oxygen and food for other organisms

Explanation:
Without photosynthesis, plants could not produce glucose and oxygen. This would eliminate the primary source of oxygen in the atmosphere and remove the base of most food chains, causing collapse of ecosystems. Animals depend on plants for both oxygen and nutrition.

Question: Based on the Fascinating Facts section about Vrikshayurveda, what key message does the ancient text convey about plant growth?
A. Trees produce fruits and flowers simply because they are planted
B. Trees require more than just planting; they need proper conditions like water, sunlight, and nutrients to thrive
C. Trees grow best when planted during winter seasons
D. Fruits and flowers emerge within days of planting seeds
Show Answer & Explanation

Answer: (B) Trees require more than just planting; they need proper conditions like water, sunlight, and nutrients to thrive

Explanation:
The ancient text Vrikshayurveda states that trees do not produce fruits and flowers merely because they are planted. It documents systematic knowledge about plant growth, soil, and agricultural practices needed to improve crop health and production, emphasising that proper conditions are essential.

Question: When a plant is destarched by keeping it in darkness for 36 hours before Activity 10.3, what is the primary purpose of this step?
A. To prevent the plant from performing respiration
B. To remove existing starch so that any new starch produced during the experiment is clearly from photosynthesis
C. To weaken the plant so it grows slower
D. To convert all chlorophyll into a colourless form
Show Answer & Explanation

Answer: (B) To remove existing starch so that any new starch produced during the experiment is clearly from photosynthesis

Explanation:
By destarching the plant, any starch that appears after the experiment can be confidently attributed to food synthesis during the activity period. If the plant retained old starch, it would be impossible to distinguish between pre-existing and newly synthesised starch in the test results.

Question: In Activity 10.4, why was caustic soda specifically placed inside the bottle rather than outside it?
A. To absorb water vapour from inside the leaf
B. To kill bacteria that might interfere with photosynthesis
C. To absorb carbon dioxide from the air inside the bottle, depriving that part of the leaf
D. To provide minerals needed for starch synthesis
Show Answer & Explanation

Answer: (C) To absorb carbon dioxide from the air inside the bottle, depriving that part of the leaf

Explanation:
Caustic soda absorbs carbon dioxide from the air. By placing it inside the bottle around half of the leaf, it removes carbon dioxide from that microenvironment. Since carbon dioxide is necessary for starch synthesis, the absence of this gas causes that leaf part to fail the iodine test, demonstrating carbon dioxide's essential role.

Question: Which structural feature of leaves makes them particularly suitable for photosynthesis, according to section 10.2.1?
A. Their thick, waxy protective coating
B. Their broad and flat shape, which allows efficient sunlight capture and large surface area for gas exchange
C. Their ability to store starch in special cells
D. Their connected network of roots
Show Answer & Explanation

Answer: (B) Their broad and flat shape, which allows efficient sunlight capture and large surface area for gas exchange

Explanation:
The chapter states that leaves are generally broad and flat by design. This structure allows them to capture sunlight efficiently and provides a large surface area for gas exchange through stomata, making them ideal for photosynthesis and justifying their role as 'food factories'.

Question: What does the term 'photosynthesis' specifically refer to, based on the chapter's definition?
A. The breakdown of glucose to release energy in plant cells
B. The process by which plants prepare food in the presence of sunlight and chlorophyll
C. The transport of water through the xylem to leaves
D. The respiration process that occurs only in green plants
Show Answer & Explanation

Answer: (B) The process by which plants prepare food in the presence of sunlight and chlorophyll

Explanation:
Photosynthesis is defined in the chapter as the process by which plants prepare food in the presence of sunlight and chlorophyll, using carbon dioxide and water as raw materials to produce glucose and oxygen.

Question: Rustom Hormusji Dastur, mentioned in the 'Know a Scientist' section, studied which aspects of photosynthesis in plants?
A. The structure of chloroplasts under a microscope
B. The effects of water amount and temperature on photosynthesis, and the importance of light colour
C. The history of photosynthesis discoveries
D. The mechanisms of respiration in plant roots
Show Answer & Explanation

Answer: (B) The effects of water amount and temperature on photosynthesis, and the importance of light colour

Explanation:
The chapter states that Dastur studied the effects of the amount of water and temperature on photosynthesis. He examined the importance of water, temperature, and the colour of light in the process of photosynthesis, contributing valuable knowledge to plant science.

Question: What is the relationship between the presence of non-green coloured pigments and photosynthesis in certain plant leaves?
A. Non-green pigments prevent photosynthesis from occurring
B. These coloured pigments hide the green chlorophyll but some also assist in photosynthesis, and starch can be detected using iodine tests
C. Non-green leaves perform a different process called chemosynthesis
D. These pigments absorb all light energy preventing photosynthesis
Show Answer & Explanation

Answer: (B) These coloured pigments hide the green chlorophyll but some also assist in photosynthesis, and starch can be detected using iodine tests

Explanation:
The Fascinating Facts section explains that some plant leaves have red, violet, or brown pigments that hide the chlorophyll. However, some of these pigments also help in photosynthesis, and an iodine test can confirm starch presence, indicating that photosynthesis occurs despite the non-green appearance.

Question: When a potted plant is kept in complete darkness with adequate water supply for an extended period, which visible change would most likely occur in its leaves?
A. The leaves would become thicker and darker green
B. The leaves would gradually turn pale or yellowish in colour
C. The leaves would develop a waxy coating for protection
D. The leaves would remain unchanged since water is still available
Show Answer & Explanation

Answer: (B) The leaves would gradually turn pale or yellowish in colour

Explanation:
The chapter demonstrates through Activity 10.1 that plants kept in darkness without sunlight show stunted growth and pale leaves. Since photosynthesis requires sunlight and produces chlorophyll, leaves cannot maintain their green colour without light exposure, even with adequate water and minerals present.

Question: In Activity 10.4, when half of a destarched leaf was inserted into a bottle containing caustic soda solution, the half inside the bottle did not turn blue-black with iodine while the half outside did. This result most directly demonstrates the necessity of which substance for starch formation?
A. Chlorophyll
B. Carbon dioxide
C. Water
D. Minerals
Show Answer & Explanation

Answer: (B) Carbon dioxide

Explanation:
Caustic soda absorbs carbon dioxide from the air. The part of the leaf inside the bottle lacked carbon dioxide and produced no starch, while the external part with access to atmospheric carbon dioxide produced starch. This contrast directly proves that carbon dioxide is essential for starch synthesis.

Question: According to the word equation for photosynthesis presented in section 10.2.3, which pair correctly identifies one raw material and one product of this process?
A. Water and starch
B. Carbon dioxide and oxygen
C. Glucose and water
D. Chlorophyll and carbohydrates
Show Answer & Explanation

Answer: (B) Carbon dioxide and oxygen

Explanation:
The word equation states: Carbon dioxide + Water → Glucose + Oxygen (with sunlight and chlorophyll). Carbon dioxide is a raw material taken in by the plant, while oxygen is released as a product. The other options either pair two raw materials together or incorrectly identify products as raw materials or vice versa.

Question: In Activity 10.7, when red ink was added to the water in which a plant's stem was placed, the dye eventually appeared in the leaves and flowers. Which of the following best explains how the red colour reached these upper parts of the plant?
A. The dye was carried upward through the phloem tissue from the leaves
B. The dye was transported upward through the xylem tissue in the stem
C. The roots actively pumped the dye through the plant's vascular system
D. The dye dissolved in water and seeped through the plant's cell walls naturally
Show Answer & Explanation

Answer: (B) The dye was transported upward through the xylem tissue in the stem

Explanation:
• The xylem is the thin tube-like tissue responsible for transporting water and minerals from roots upward through stems and branches
• The red ink acts similarly to water and minerals, moving through the xylem vessels
• Phloem, by contrast, transports food from leaves downward, not colored water upward
• The activity specifically identifies xylem as the structure enabling this upward movement

Question: During Activity 10.5, when a lit matchstick was inserted into the gas that had accumulated in the inverted test tube over a water plant in sunlight, the matchstick burned with an intense flame. What does this observation most reliably indicate about the collected gas?
A. It contains a high concentration of nitrogen
B. It is primarily composed of oxygen
C. It consists mainly of carbon dioxide
D. It is a mixture of all atmospheric gases in equal proportions
Show Answer & Explanation

Answer: (B) It is primarily composed of oxygen

Explanation:
Oxygen supports combustion intensely, causing flames to burn brighter and hotter. The intense flame produced when the matchstick was inserted demonstrates that the collected gas contains a high concentration of oxygen, which is released during photosynthesis as a byproduct.

Question: A student conducts an experiment where she places different potted plants under various conditions: (1) sunlight with water, (2) sunlight without water, (3) darkness with water, and (4) darkness without water, all for two weeks. Based on the findings described in the chapter, which plant would show the best overall growth including height and number of leaves?
A. The plant in darkness without water
B. The plant in sunlight without water
C. The plant in darkness with water
D. The plant in sunlight with water
Show Answer & Explanation

Answer: (D) The plant in sunlight with water

Explanation:
Activity 10.1 clearly establishes that plants require both sunlight and water for optimal growth. The plant receiving both conditions—sunlight for photosynthesis and water for transport of nutrients and photosynthesis itself—would demonstrate maximum increases in height, leaf number, and leaf colour compared to all other conditions where at least one essential factor is missing.

Question: Kamala Sohonie, mentioned in the chapter's 'Know a Scientist' section, received her Ph.D. from Cambridge University for remarkable contributions in which area of plant science?
A. Photosynthesis and chlorophyll production
B. Respiration in plants
C. Water transport mechanisms in roots
D. Mineral nutrient absorption by leaves
Show Answer & Explanation

Answer: (B) Respiration in plants

Explanation:
The chapter explicitly states that Kamala Sohonie received her Ph.D. degree for her remarkable contribution in the area of respiration in plants from Cambridge University. She later applied this knowledge to improve the nutritive values of plant foods in her work in India.

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