A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagram and answer the questions:

(a) What aspect of photosynthesis is being tested in the above diagram?

(b) Why was the plant placed in the dark before beginning the experiment?

(c) Write a balanced chemical equation to represent the process of photosynthesis.

(d) What will be the result of starch test when performed on leaf A shown in the diagram?

(e) Draw a neat and labelled diagram of a chloroplast.

Given below is the diagram of an experimental set-up (final stage). Study the same and answer the following questions :

(a) What is the main aim of the experiment?

(b) Oxygen gas shown in the experiment is released from which of the raw materials ?

(c) How would you confirm the presence of oxygen gas?

(d) Name the chemical substance which can be added in water to enhance the process/rate of release of oxygen gas.

(e) Draw a neat and labelled diagram of the same experiment for its initial stage.

Given below is the representation of a certain phenomenon in nature with four organisms 1-4.

(a) Name the phenomenon represented.

(b) Name any one organism that could be shown at No .5

(c) Name the biological process which was the starting point of the whole chain.

(d) Name one natural element which all the organisms 2-4 and even 5 are getting from No. 1 for their survival.

Given below is the diagram of an experimental set-up:

a. What is the objective of this experiment?

b. Will it work satisfactorily? Given reason.

c. What alteration (s) will you make in it for obtaining expected result?

d. Would you take any step before starting the experiment? Describe this step and explain its necessity.