Chapter 10 Solutions — Life Processes in Plants

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1. 1.
   Complete the following table comparing Photosynthesis and Respiration across four features: Raw materials, Products, Word equation, and Importance.
2. 2.
   Imagine a situation where all the organisms that carry out photosynthesis on the earth have disappeared. What would be the impact of this on living organisms?
3. 3.
   A potato slice shows the presence of starch with iodine solution. Where does the starch in potatoes come from? Where is the food synthesised in the plant, and how does it reach the potato?
4. 4.
   Does the broad and flat structure of leaves make plants more efficient for photosynthesis? Justify your answer.
5. 5.
   X is broken down using Y to release carbon dioxide, Z, and energy. X + Y → Carbon dioxide + Z + Energy. X, Y, and Z are three different components of the process. What do X, Y, and Z stand for?
6. 6.
   Krishna set-up an experiment with two potted plants of same size and placed one of them in sunlight and the other in a dark room (Fig. 10.10). Answer:

   • (i) What idea might she be testing through this experiment?
   • (ii) What are the visible differences in plants in both the conditions?
   • (iii) According to you, leaves of which plants confirm the iodine test for the presence of starch?
7. 7.
   Vani believes that 'carbon dioxide is essential for photosynthesis'. She puts an experimental set-up (Fig. 10.11) with four conditions:

   • (a) Sunlight with CO₂,
   • (b) Sunlight without CO₂,
   • (c) Dark with CO₂,
   • (d) Dark without CO₂. All plants have sufficient water. Answer:
   • (i) In which plant(s) will starch be formed?
   • (ii) In which plant(s) will starch NOT be formed?
   • (iii) In which plant(s) will oxygen…
8. 8.
   Ananya took four test tubes (A, B, C, D) filled three-fourths with water. Test tube A: snail only; B: water plant only; C: snail + plant; D: water only. She added a carbon dioxide indicator to all and recorded initial colour, then observed colour changes after 2–3 hours. What does she want to find out? How will she know if she is correct?
9. 9.
   Design an experiment to observe if water transportation in plants is quicker in warm or cold conditions.
10. 10.
    Photosynthesis and respiration are essential to maintain balance in nature. Discuss.