Explain starch sugar hypothesis ?

Given below is a diagram of the stomatal apparatus. Match the labels with the corresponding names of the compounds. 

Choose the correct combination.

Study the diagram and the list given below.

i) Chloroplast

ii) Epidermal cell

iii) Guard cell

iv) Subsidiary cell

v) Stomatal pore

The correct match is

How does guard cells relate to photosynthesis?

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

What is transcription and what are its types?