Sexual Reproduction in Flowering Plants PYQ

Given below are two statements : One is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus. Reason (R) : Presence of more than one nucleus in the tapetum increases the efficiency of nourishing the developing microspore mother cells. In light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both wind and water pollinated flowers are not very colourful and do not produce nectar. Reason (R) : The flowers produce enormous amount of pollen grains in wind and water pollinated flowers. In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A typical unfertilised, angiosperm embryo sac at maturity is 8 nucleate and 7-celled. Reason (R) : The egg apparatus has 2 polar nuclei. In the light of the above statements, choose the correct answer from the options given below :

How many meiotic and mitotic divisions need to occur for the development of a mature female gametophyte from the megaspore mother cell in an angiosperm plant?

Identify the correct description about the given figure: 

Pollen grains remain preserved as fossils due to the presence of :

Which part of the ovule stores reserve food materials?

Identify the set of correct statements: A. The flowers of Vallisneria are colourful and produce nectar. B. The flowers of water lily are not pollinated by water. C. In most of water-pollinated species, the pollen grains are protected from wetting. D. Pollen grains of some hydrophytes are long and ribbon like. E. In some hydrophytes, the pollen grains are carried passively inside water. Choose the correct answer from the options given below.

What is the function of tassels in the corn cob?

Transfer of pollen grains from anther to stigma of another flower of same plant is known as:

In which of the following sets of families, the pollen grains are viable for months?

In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem. Reason (R): Internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves. In the light of the above statements, choose the correct answer from the options given below:

Large, colourful, fragrant flowers with nectar are seen in:

In angiosperms the correct sequence of events in formation of female gametophyte in the ovule is (A) 3 successive free nuclear divisions in functional megaspores. (B) Degeneration of 3 megaspores. (C) Meiotic division in megaspore mother cell. (D) Migration of 3 nuclei towards each pole. (E) Formation of wall resulting in seven celled embryo sac. Choose the correct answer from the options given below.

The residual persistent part which forms the perisperm in the seeds of beet is :

In general the egg apparatus of embryo sac in angiosperm consists of :

Which part of the fruit, labelled in the given figure make it a false fruit 

Identify the incorrect statement related to Pollination:

Given below are two statements : Statement I: Cleistogamous flowers are invariably autogamous Statement II: Cleistogamy is disadvantageous as there is no chance for cross pollination In the light of the above statements, choose the correct answer from the options given below :

To ensure that only the desired pollens fall on the stigma in artifical hybridization process : (a) the female flower buds of plant producing unisexual flower need not be bagged. (b) there is no need to emasculate unisexual flowers of selected female parent (c) emasculated flowers are to be bagged immediately after cross pollination (d) emasculated flowers are to be bagged after removal of anthers (e) bisexual flowers, showing protogyny are never selected for cross Choose the correct answer from the options given below :

Which of the following can be expected if scientists succeed in introducing apomictic gene into hybrid varieties of crops ?

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is

In some members of which of the following pairs of families, pollen grains retain their viability for months after release?