Sexual Reproduction in Flowering Plants

A dioecious flowering plant prevents both

1. autogamy and geitonogamy
2. geitonogamy and xenogamy
3. cleistogamy and xenogamy
4. autogamy and xenogamy.

Double fertilisation is exhibited by

1. algae
2. fungi
3. angiosperms
4. gymnosperms

The coconut water from tender coconut represents

1. free nuclear proembryo
2. free nuclear endosperm
3. endocarp
4. fleshy mesocarp.

Which one of the following statements is not true?

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

Seed formation without fertilisation in flowering plants involves the process of

1. somatic hybridisation
2. apomixis
3. sporulation
4. budding.

Proximal end of the filament of stamen is attached to the

1. placenta
2. thalamus or petal
3. anther
4. connective.

Which of the following statements is not correct?

1. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
2. Some reptiles have also been reported as pollinators in some plant species.
3. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
4. Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.

In majority of angiosperms

1. egg has a filiform apparatus
2. there are numerous antipodal cells
3. reduction division occurs in the megaspore mother cells
4. a small central cell is present in that embryo sac.

Pollination in water hyacinth and water lily is brought about by the agency of

1. water
2. insects or wind
3. birds
4. bats.

The ovule of an angiosperm is technically equivalent to

1. megasporangium
2. megasporophyll
3. megaspore mother cell
4. megaspore.