Double fertilisation is the

• fertilisation of two eggs in an embryo sac

• fusion of one male gamete with the egg cell and another male gamete with the secondary nuclei

• fusion of two male gametes with two polar nuclei

• fusion of one male gamete with secondary nucleus

Mycoplasma is resistant for

• penicillin

• tetracycline

• streptomycin

• All of the above

After pollination the number of chromosome in egg will be

• n

• 2n

• 3n

• None of these

In lysogenic phase which of the following takes place?

• Phage DNA integrated with host genome and does not multiplied

• Phage DNA does not integrate with host genome

• Phage DNA integrates with host genome and bacterial cell does not lyse

• Phage DNA integrated with host DNA and multiplied

The reduction division in chromosomes takes place in

• pollen grains

• tapetum

• megaspore cell

• megaspore mother cell

Gametes formation in animals is found in

• ovaries

• gonads

• gall bladder

• testes

The development ofsporangium in Pteridium is

• a leptosporangiate type

• an eusporangiate type

• Both (a) and (b)

• None of the above

Hydra is

• herbivorous

• more developed

• carnivorous

• omnivorous

The biomass pyramid of forest ecosystem is

• linear

• inverted

• tetra angle

• upright

The RNA found in eukaryotic ribosomes are

• 5 S and 16 S RNA

• 5 S, 16 S, 18 S RNA

• 23S, 16 S, RNA

• 5 S and 28 S RNA