Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options:
 

1.	Both processes can happen together because the diffusion coefficient of water and CO2 is different
2.	The above processes happen only during the night-time.
3.	One process occurs happen only in the daytime and the other at night
4.	Both processes cannot happen simultaneously

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1-N/K):

1.	when N nears the carrying capacity of the habitat
2.	when N/K equals zero
3.	when the death rate is greater than the birth rate
4.	when N/K is exactly one

Which one of the following statements is not true?

1.	Exine of pollen grains is made up of sporopollenin
2.	Pollen grains of many species cause severe allergies
3.	Stored pollen in liquid nitrogen can be used in crop breeding programs
4.	Tapetum helps in the dehiscence of anther