Question 1

How many theca are present in each lobe of a typical bilobed angiosperm anther ?

Accepted Answer

A typical angiosperm anther is bilobed, meaning it consists of two lobes. Each lobe contains two theca, which makes the anther dithecous. Therefore, there are 2 theca present in each lobe of a typical bilobed angiosperm anther.

Question 2

Which of the following in female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the eggs ?

Accepted Answer

In the female gametophyte (embryo sac) of an angiosperm, the synergids possess special cellular thickenings at the micropylar tip called the filiform apparatus. The filiform apparatus plays a crucial role in guiding the pollen tube into the synergid for the release of male gametes during fertilization.

Question 3

Which of the following plant produces non-albuminous seeds ?

Accepted Answer

Non-albuminous (or ex-albuminous) seeds are those in which the endosperm is completely consumed during embryo development before seed maturation. Examples of non-albuminous seeds include pea, groundnut, and gram. Albuminous seeds retain a part of the endosperm as it is not completely used up during embryo development. Examples include wheat, maize, barley, and castor. Therefore, pea produces non-albuminous seeds. Answer: Pea

Question 4

Arrange the following in the correct development sequence related to microsporogenesis : A. Microspore tetrads B. Sporogenous tissue C. Pollen grains D. Pollen mother cells Choose the correct answer f

Accepted Answer

During the development of an anther, the cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads. Each cell of the sporogenous tissue acts as a pollen mother cell (PMC). The PMCs undergo meiosis to form microspore tetrads. As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains. The correct developmental sequence is: Sporogenous tissue Pollen mother cells Microspore tetrads Pollen grains. This corresponds to the

Question 5

Which one of the following types of pollination brings genetically different types of pollen grains to the stigma ?

Accepted Answer

Autogamy is the transfer of pollen grains from the anther to the stigma of the same flower, resulting in genetically identical offspring. Geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower of the same plant. Although it is functionally cross-pollination involving a pollinating agent, it is genetically similar to autogamy since the pollen grains come from the same plant. Cleistogamy occurs in closed flowers which do not open at all, ensuring strict autoga

Question 6

If the diploid chromosome number of typical angiosperm is 36, what would be the chromosome number in its endosperm ?

Accepted Answer

The diploid chromosome number of the angiosperm is given as 2n = 36. The haploid chromosome number is n = 36 2 = 18. In typical angiosperms, the endosperm is formed by the process of triple fusion, where one haploid male gamete fuses with the diploid secondary nucleus (formed by two haploid polar nuclei). Therefore, the ploidy level of the endosperm is triploid (3n). The chromosome number in the endosperm will be 3n = 3 18 = 54.

Question 7

Which one of the following is a triploid cell ?

Accepted Answer

Synergids are haploid (n) cells present in the embryo sac. The central cell contains two polar nuclei (n + n) which fuse to form a diploid secondary nucleus (2n). The zygote is a diploid (2n) cell formed by the fusion of a male gamete (n) with the egg cell (n). The primary endosperm cell is formed by the fusion of a male gamete (n) with the two polar nuclei or secondary nucleus (2n) of the central cell. This process is called triple fusion, resulting in a triploid (3n) primary endosperm cell. An

Question 8

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 produ

Accepted Answer

Both wind and water pollinated flowers are not very colourful and do not produce nectar, this is because they rely on wind and water to carry their pollen. Wind and water pollinated flower do not need to attract insect, so they did not evolve to produce bright coloured flower.

Question 9

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-

Accepted Answer

A typical Angiosperm embryo sac, at maturity is 7 -celled and 8 nucleate. Polar nuclei are situated below the egg apparatus in the large central cell. Three cells are grouped together at micropylar end and constitute the egg apparatus. Hence, A is true but R is false.

Question 10

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 nuc

Accepted Answer

Cell of the tapetum possess dense cytoplasm and generally have more than one nucleus because the presence of more than one nucleus in the tapetal cells increases the efficiency of nourishing the develpoing pollen grains.

Question 11

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?

Accepted Answer

Development of a mature female gametophyte, i.e., embryo sac from a megaspore mother cell in an angiosperm plant requires 1 meiotic and 3 mitotic divisions.

Question 12

Which part of the ovule stores reserve food materials?

Accepted Answer

Nucellus is a mass of cell enclosed within the integument and it has abundant food reserves. Each ovule has one or more protective layer called integuments. The ovule is a small structure attached to the placenta by means of a stalk called funicle.

Question 13

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

Accepted Answer

Flowers of Vallisneria are not colourful and do not produce nectar. Waterlily is pollinated by insect or wind. In water-pollinated species, pollen grains are protected from wetting by a mucilaginous covering. In some hydrophytes such as Vallisneria pollen grains are carried passively by water current.

Question 14

Identify the correct description about the given figure:

Accepted Answer

The given diagram shows a wind pollinated plant showing compact inflorescence and well exposed stamens. Stamens are exposed so complete autogamy does not occur.

Question 15

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

Accepted Answer

Pollen grains are well-preserved as fossils because of the presence of sporopollenin, which is found in the outer layer of pollen, i.e., exine.

Sexual Reproduction in Flowering Plants — Previous Year Questions & Solutions