AIIMS Botany Sexual Reproduction In Flowering Plants Class 12 Questions

Which of the following is incorrect

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

Which of the following is correct for above diagrams:

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?

Which of the following is correct mode of reproduction

Pollen grains are used for haploid cultures since they possess n number of chromosomes so that are required for haploid cultures.

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.

Match column I with column II and select the correct option from the given codes.

Assertion: Endothecium layer of anther wall plays an important role in dehiscence of anther. Reason: The presence of fibrous bands and differential expansion of inner and outer tangential walls of endothecial cells cause dehiscence of anther.

The small projections present on the surface of pineapple fruit represent

Pollination in Rafflesia is occurred by

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

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?