AIIMS Botany Sexual Reproduction In Flowering Plants Class 12 Questions

The process of removal of anther from the flower bud before it dehisces is called as

Assertion: Parthenocarpy involves formation of seedless fruit. Reason: Apomixis occurs without fertilization

Identify the parts labeled in the diagram.

Which statement is correct for apomixes?

Mark the correct one

Assertion: Selaginella&Salvinia are homosporous. Reason: In pteridophyte, Lycopodium is precursor of seed habit

Haploid cultures can be obtained by culturing:

Assertion: The pre-pollination growth of male gametophyte occurs inside the microsporangium whereas the rest of the growth occurs over the female reproductive organs. Reason: Growth of the entire female gametophyte occurs inside the megasporangium.

Each of these questions contains two statements. Assertion (A) and Reason (R). Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below. Assertion (A) Female gametophyte in angiosperm is eight nucleate. Reason (R) Double fertilisation occurs in S angiosperms.

Assertion: The endosperm in gymnosperm is formed after fertilization. Reason: The endosperm of gymnosperm is formed by triple fusion.

The sequence of development during the formation of endosperm is

Assertion: The presence of endosperm is essential for the development of embryo in angiosperms. Reason (R): It helps in the maturation of embryo after fertilisation.

Assertion (A) Female gametophyte in angiosperm is eight nucleate. Reason (R) Double fertilization occurs in angiosperms.

Cleistogamy is leading over anthesis because

Assertion : In some species of asteraceae and poaceae seeds are formed without fertilization. Reason : Formation of fruit without fertilization is called parthenocarpy.

Assertion: Protandry and protogyny ensures cross fertilization. Reason: Cross fertilization introduces variation in progeny.

Assertion: Pollen mother cells (PMCs) are the first male gametophytic cells. Reason: Each PMC gives rise to two pollens.

Even after killing the generative cell with a laser beam, the pollen grain of a flowering plant germinates and produces normal pollen tube because

Assertion: Maize is an albuminous seed. Reason: Endosperm is totally absorbed by its growing embryo

Composite fruit develops from

Apomixis is

Assertion (A) : Conifer trees produce a large quantity of wind borne pollen grains. Reason (R) : The pollen grains have wings.

A scion is grafted to a stock. The quality of fruits produced will be determined by the genotype of

Plants of which one of the following groups of genera are pollinated by the same agency?

Double fertilization involves

The pollen tube usually enters the embryo sac

Pollen grains are able to withstand extremes of temperature and desiccation because their exine is composed of:

The plant part which consists of two generations, one within the other, is:

Assertion : Many visitors to the hills suffer from skin and respiratory allergy problem. Reason : Conifer trees produce a large quantity of wind-borne pollen grains.

Assertion : The megaspore mother cell undergoes mitosis to produce four megaspores. Reason : Megaspore mother cells and the megaspores are both haploid.

Assertion : The two cotyledons in the seed are the embryonic leaves. Reason : The embryo contains radicle and plumule.

During which of the following formation free nuclear division occurs?