Which one of the following statements is not true?

• Exine of pollen grains is made up of sporopollenin

• Pollen grains of many species cause severe allergies

• Stored pollen in liquid nitrogen can be used in the crop breeding programmes

• Stored pollen in liquid nitrogen can be used in the crop breeding programmes

In bryophytes and pteridophytes, transport of male gametes requires

• insects

• birds

• water

• water

Proximal end of the filament of stamen is attached to the

• connective

• placenta

• thalamus

• thalamus

The coconut water from tender coconut represents

• fleshy mesocarp

• free-nuclear proembryo

• free-nuclear endosperm

• free-nuclear endosperm

Whic of the following statements is not correct?

• Insects that consume pollen or nectar without bringing about pollination are called pollen nectar robbers

• Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil

• Some reptiles have also been reported as pollinators in some plant species

• Some reptiles have also been reported as pollinators in some plant species

Seed formation without fertilisation in flowering plants involves the process of

• budding

• Somatic hybridisation

• Apomixis

• Apomixis

Megasporangium is equivalent to

• embryo sac

• fruit

• nucellus

• nucellus

Read the following statements (IV) and answer the question which follows them
I. In liverworts, mosses and ferns gametophytes are free living.
II) Gymnosperms and some ferns are heterospores.
III) Sexual reproduction in Fucus, Volvox and Albugo is oogamous.
IV) The sporophyte in liverworts is more elaborate than that in mosses.

How many of the above statements  are correct?

• One

• Two

• Three

• Three

9.

Which one of the following statement is correct?

• Hard outer layer of pollen is called intine

• Sporogenous tissue is haploid

• Endothecium produces the microspores

• Endothecium produces the microspores

Product of sexual reproduction generally generates

• longer viability of seeds

• prolonged dormancy

• new genetic combination leading to variation

• new genetic combination leading to variation