Look at the illustration depicting the food chain:

a. The correct explanation of the organisms is:

b. Why is ‘A’ called an autotroph?

Observe the given model that can be used to demonstrate the breathing mechanism in human beings.

Name the structures which can be compared to:

(i) Lungs (ii) Diaphragm

(iii) Trachea (iv) Nostrils (Nose)

Observe the following figures:

Both the plants ‘A’ and ‘B’ were kept in sunlight after watering. The part of the leaf of plant ‘B’ which was inserted in the glass bottle containing KOH (Potassium hydroxide) did not turn blue in the iodine test/ starch test, indicating the absence of starch. The part of the leaf outside the bottle turns blue in the said test. Photosynthesis didn’t occur in that part of the leaf due to the non-availability of _____________ .

a) Sunlight b) Chlorophyll

c) CO₂ d) Water

(i) List out the factors which are available to the part of the leaf outside the bottle.

Observe the following flow-chart:

a) What is ‘X’ in this figure denote?

b) In what way is it different from blood?

Observe the following experiment:

i) Name the phenomenon it depicts and the gas that is released.

a) Respiration, CO₂

b) Photosynthesis, O₂

c) Transpiration, H₂ O

d) Excretion, N₂

ii) What is photosynthesis? Write a balanced equation for this biochemical reaction.