Question

(i) Draw the diagram of cross section of a leaf and label the following Parts :

(a) chloroplast (b) cuticle

(ii) A gas is released during photosynthesis. Name the gas and also state the way in which the gas is evolved.

(iii) In certain group of plants, stomata remains closed during day. How is food synthesized by such plants ? Also name them.

Answer 1

(i)

(ii) Oxygen

By splitting of water 2H₂O + splits →H₂ + O₂  

(iii) They take up CO₂ at night and prepare an intermediate which is acted upon by the energy absorbed by chlorophyll during the day.

1. Desert plants. [Xerophytic plants]