Question

In the experimental setup to establish that one of the atmospheric gases is essential for photosynthesis and respiration.
A. Name the atmospheric gas which is essential for photosynthesis and respiration.
B. What is kept in the watch glass in figure and why?
C. State the difference between the plants in the pots A and B after few days

Answer 1

Answer:

(A) Carbon-dioxide

(B) Potassium Hydroxide is kept in watch glass in figure A. It is used to absorb Carbon-dioxide.

(C) When tested for starch, only the leaves in pot B will contain starch.

EXPLANATION:

Activity 6.2 from NCERT textbook science class 10.

Answer 2

(A) Carbon-dioxide

(B) Potassium Hydroxide is kept in watch glass in figure A.

(C) When tested for starch, only the leaves in pot B will contain starch.

Explanation:

As a result, no carbon dioxide is available for the plant. In the absence of Carbon dioxide plant is unable to do photosynthesize and form starch. So, iodine does not turn the leaf blue.

The plant kept in bell without Potassium hydroxide can do photosynthesis and form starch. So, iodine solution here turns the leaf blue.