Class 7 Science Curiosity Chapter 10 Life Processes in Plants MCQs explore how plants prepare, transport and use food. Practise photosynthesis, starch tests, stomata, xylem, phloem and respiration through questions with answers and explanations. The activities connect plant growth with sunlight and water and investigate the role of carbon dioxide. Use these questions to distinguish food production from food transport and to understand why both green and non-green plant parts need energy.
Class 7 Science Curiosity Chapter 10 MCQs with Answer
Class 7 Science Chapter 10 MCQs Set 1
Q1. In the three-pot activity, which plant is expected to grow best?
[A]. The plant receiving sunlight but no water
[B]. The plant receiving water but kept in darkness
[C]. The plant receiving neither sunlight nor water
[D]. The plant receiving both sunlight and adequate water
Q2. Which green pigment in leaves helps capture sunlight?
[A]. Starch
[B]. Chlorophyll
[C]. Glucose
[D]. Iodine
Q3. What does a blue-black colour in an iodine test on a leaf indicate?
[A]. The presence of oxygen alone
[B]. The absence of all food
[C]. The complete removal of water
[D]. The presence of starch
Q4. Why is a leaf decolourised before testing it with iodine?
[A]. To add starch to every part of the leaf
[B]. To make the leaf absorb sunlight in darkness
[C]. To make the colour change caused by iodine easier to observe
[D]. To turn its water into carbon dioxide
Q5. Why does the chapter say alcohol should not be heated directly over a flame during the leaf test?
[A]. Alcohol is always colder than ice
[B]. Alcohol prevents all heat transfer
[C]. Alcohol contains large amounts of starch
[D]. Alcohol is highly flammable
Class 7 Science Chapter 10 MCQs Set 2
Q6. In the sunlight experiment with a leaf having green and non-green patches, which patches turn blue-black with iodine?
[A]. No patch because sunlight destroys iodine
[B]. Every patch equally, even without starch
[C]. Only the non-green patches
[D]. The green patches that have produced detectable starch
Q7. Why can some red, violet, or brown leaves still carry out photosynthesis?
[A]. They may contain chlorophyll hidden by other coloured pigments
[B]. They always obtain all their food directly from soil
[C]. They carry out photosynthesis without any pigments
[D]. Their colour proves that they never contain chlorophyll
Q8. Why is a potted plant kept in darkness for two to three days before the carbon dioxide experiment?
[A]. To use up its stored starch before the test
[B]. To replace all its chlorophyll with iodine
[C]. To fill its leaves with extra starch
[D]. To make its roots stop needing water permanently
Q9. What is the role of caustic soda in the experiment testing the need for carbon dioxide?
[A]. It adds chlorophyll to the leaf
[B]. It produces starch inside the bottle
[C]. It absorbs carbon dioxide from the air inside the bottle
[D]. It supplies sunlight to the leaf
Q10. Which set contains the four requirements for photosynthesis described in the chapter?
[A]. Water, carbon dioxide, sunlight, and chlorophyll
[B]. Starch, iodine, alcohol, and oxygen
[C]. Glucose, oxygen, soil, and darkness
[D]. Water, oxygen, darkness, and iodine
Class 7 Science Chapter 10 MCQs Set 3
Q11. In the water-plant experiment, which gas collected in sunlight makes a lit matchstick burn more intensely?
[A]. Water vapour alone
[B]. Oxygen
[C]. Carbon dioxide
[D]. Nitrogen alone
Q12. In which form is food first produced during photosynthesis before some of it is converted into starch?
[A]. Alcohol
[B]. Glucose
[C]. Carbon dioxide
[D]. Iodine
Q13. What are the tiny pores on leaf surfaces that help in gas exchange called?
[A]. Roots
[B]. Stomata
[C]. Xylem
[D]. Seeds
Q14. Which part of a plant takes up water and minerals from the soil?
[A]. Fruits alone
[B]. Roots
[C]. Leaf pigments
[D]. Flowers alone
Q15. Which structures transport water and dissolved minerals from the roots to the leaves?
[A]. Stomata alone
[B]. Phloem
[C]. Chlorophyll pigments
[D]. Xylem
Class 7 Science Chapter 10 MCQs Set 4
Q16. Which structures carry food prepared in the leaves to other parts of the plant?
[A]. Phloem
[B]. Root soil particles
[C]. Xylem alone
[D]. Stomatal pores alone
Q17. Why does limewater connected to a flask containing germinating seeds turn milky?
[A]. The seeds produce chlorophyll gas
[B]. The seeds release iodine into the air
[C]. The respiring seeds release carbon dioxide
[D]. The seeds turn all oxygen into sunlight
Q18. Which parts of a living plant carry out respiration?
[A]. Both green and non-green parts
[B]. Only the green parts
[C]. Only the flowers
[D]. Only the parts exposed to sunlight
Q19. In the equation X + Y → carbon dioxide + Z + energy, what do X, Y, and Z represent in plant respiration?
[A]. Glucose, oxygen, and water
[B]. Water, carbon dioxide, and glucose
[C]. Oxygen, starch, and chlorophyll
[D]. Sunlight, water, and iodine
Q20. Why does the broad and flat structure of many leaves help photosynthesis?
[A]. It keeps chlorophyll away from light
[B]. It provides a large surface to receive sunlight
[C]. It prevents all gas exchange
[D]. It allows leaves to absorb food directly from soil
Class 7 Science Chapter 10 MCQs Set 5
Q21. A healthy green plant has water and sunlight but is kept without carbon dioxide. What is the expected effect on photosynthesis?
[A]. It cannot make new food by photosynthesis under these conditions
[B]. It replaces carbon dioxide with iodine
[C]. It makes more food because carbon dioxide is harmful
[D]. Its roots immediately begin photosynthesis without light
Q22. A student claims that roots absorb ready-made food from soil and send it to leaves. Which sequence better explains the processes in a green plant?
[A]. Roots absorb water; leaves make food by photosynthesis; phloem distributes food
[B]. Roots absorb sunlight; leaves make soil; stomata store rocks
[C]. Leaves absorb starch from soil; roots turn it into sunlight
[D]. Xylem makes all food from minerals without photosynthesis
Q23. A twig with white flowers stands in red-coloured water. The flowers later show red colouring. What does this observation support?
[A]. The flowers have absorbed the colour only from sunlight
[B]. Water has moved up through the twig’s xylem
[C]. Roots are the only plant parts that can contain water
[D]. Phloem has made red ink from glucose
Q24. During the night, a living plant still needs energy. Which process can supply this energy without sunlight?
[A]. The iodine test
[B]. Photosynthesis alone
[C]. Respiration
[D]. Decolourisation with alcohol
Q25. A student says that plant roots cannot respire because they are not green. Which fact corrects this idea?
[A]. Roots obtain all their energy directly from minerals
[B]. Only parts containing chlorophyll need energy
[C]. Respiration occurs in both green and non-green living plant parts
[D]. Respiration requires bright sunlight at every moment
Class 7 Science Chapter 10 MCQs Set 6
Q26. Two similar, destarched plants receive equal water and carbon dioxide. One is kept in sunlight and the other in darkness. Which requirement is being tested?
[A]. Water
[B]. Carbon dioxide
[C]. Sunlight
[D]. The size of the pot alone
Q27. If living organisms that carry out photosynthesis disappeared, which two supplies would be directly reduced?
[A]. Water in every ocean and heat from the Sun
[B]. Sunlight reaching Earth and the number of rocks
[C]. New food production and oxygen released by photosynthesis
[D]. Carbon dioxide from respiration and all soil particles
Q28. Which pairing correctly matches the two transport systems in a plant?
[A]. Xylem: food; phloem: sunlight
[B]. Xylem: oxygen only; phloem: soil particles
[C]. Xylem: chlorophyll; phloem: iodine
[D]. Xylem: water and minerals; phloem: food
Q29. A green stem receives sunlight, water, and carbon dioxide. Why may it also prepare food?
[A]. Only parts below the soil can make food
[B]. Green stems use iodine instead of carbon dioxide
[C]. Every stem prepares food without light
[D]. Other plant parts containing chlorophyll can also perform photosynthesis
Q30. In a healthy bottle garden receiving light, how can photosynthesis and respiration help maintain the exchange of gases?
[A]. Both processes use only carbon dioxide and never release gases
[B]. Carbon dioxide from respiration can be used in photosynthesis, and oxygen from photosynthesis can be used in respiration
[C]. Photosynthesis removes all need for respiration
[D]. Respiration produces sunlight for photosynthesis
Plant Nutrition, Transport and Respiration: Chapter 10 Key Points
- Green plants prepare food by photosynthesis using carbon dioxide and water in the presence of sunlight and chlorophyll.
- Glucose is produced during photosynthesis, oxygen is released and some glucose is converted into starch for storage.
- Leaves are the main sites of photosynthesis, but other parts containing chlorophyll can also prepare food.
- Iodine gives a blue-black colour when starch is present, helping us investigate food formation in leaves.
- Keeping a plant in darkness before an experiment helps use up stored starch, making the later test easier to interpret.
- Stomata are tiny pores on leaf surfaces that help in the exchange of gases.
- Roots take up water and minerals, and xylem transports these materials through the plant.
- Phloem carries food from leaves to other parts, where it can be used or stored.
- All living plant parts respire, breaking down glucose with oxygen to release carbon dioxide, water and energy.
What Plant Experiments Can Tell You
- Comparing watered plants in sunlight and darkness helps investigate the role of light in growth and food preparation.
A leaf with green and non-green patches helps connect chlorophyll with detectable starch formation.
Removing carbon dioxide around part of a leaf tests whether that gas is needed for photosynthesis.
Coloured water moving into a twig, leaves or flowers provides evidence of transport through xylem.
Carbon dioxide released by germinating seeds provides evidence of respiration, even when they are kept in darkness.
Separate Food Preparation, Transport and Energy Release
Photosynthesis, transport and respiration answer three different questions: how food is made, where it goes and how its energy is released. A root can receive food through phloem and respire even though it is not green. A leaf can both photosynthesise in suitable light and respire as a living part. These connections are useful for Class 7 Science Chapter 10 MCQs because options may mix up the jobs of xylem and phloem or suggest that plants respire only at night. Match each process with its materials and purpose.
Study Plant Activities Further with Chapter 10 NCERT Solutions
Continue to the NCERT Solutions for Class 7 Science Curiosity Chapter 10 for the textbook questions on photosynthesis, transport and respiration. As you revise an experiment, identify the condition being changed and the observation used as evidence.
Check your understanding by tracing water from soil to a leaf and prepared food from a leaf to another plant part. Then explain why germinating seeds release carbon dioxide. Together, these steps cover the chapter’s main life processes.
