FREE NEET Biology Practice MCQ Test: Reproduction In Organisms Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

In cucumber, unisexual flowers, i.e., separate male and female flowers are present on the same plant (monoecious plant).

Answer: (b)

Answer: (a)

In Agave, bulbils are modified floral buds that develop on the flowering axis, so chromosome number in a cell of bulbil will be equal to that of the leaf cell of Agave, i.e. n = X.

Answer: (d)

Answer: (d)

Answer: (d)

A multicellular gamatophyte (gametangia), that is haploid(n) alternates with a multicellular sporophyte, that is diploid (2n). A mature sporophyte produces spores(haploid cells) by meiosis, a process which reduces the number of chromosomes to half, from 2n to n.

Answer: (c)

Answer: (a)

Morphallaxis is a mechanism of regeneration involving reorganization of body cells. In epimorphosis new cells proliferate from the surface of the wound to form the missing structure. In accretionary growth some specialized cells retain the ability to divide and produce new cells to replace the worn-out.

Answer: (c)

Answer: (b)

Since external fertilization can only take place in an aquatic habitat, there are no terrestrial animals that use it.

Answer: (d)

Answer: (a)

In the given diagram, three figures are shown. First figure indicates the fusion of male and female gametes. Second figure indicates the formed zygote because there are two nuclei visible in completely fused condition. Third figure indicates a complete new cell after fusion is completed. Now, it can be called as a new individual.

Answer: (a)

Sexual reproduction involves both meiosis and fusion of male and female haploid gametes. It is the production of new living organisms by combining genetic information from two individuals of different sexes. In higher organisms, one sex (male) produces a small motile gamete which travels to fuse with a larger stationary gamete produced by the other (female) organisms.

Answer: (a)

All of these statements concerning asexual reproduction are correct, except that asexual reproduction is best in favourable, stable environments, ones that don't change rapidly. The reason for this is that asexual reproduction, in contrast to its sexual counterpart, results in the formation of identical offspring. Although asexual organisms can often produce many more offspring in a single reproductive event than sexual organisms, these asexually produced young do not usually have the genetic variation caused by meiosis and crossing over to be able to survive a rapidly changing environment or times of environmental stress.

Answer: (d)

Potato is the common example of stem-tuber. It stores starch as reserve food material. The potato tubers are used for vegetative propagation. These possess axillary buds over their nodes or eyes. The buds produce new plantlets when a stem-tuber or a part of it having an eye is placed in the soil.

Answer: (a)

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. Vegetative reproduction is a kind of asexual reproduction in plants in which offspring are formed by vegetative propagules like tuber, sucker, runner, etc., rather than by fusion of gametes.

Answer: (a)

Certain bamboo species are monocarpic, i.e., flower generally only once in their lifetime (after 50-100 years). Other plants (jackfruit, mango and papaya) are polycarpic, i.e., produce flowers and fruits many times during their lifetime.

Answer: (a)

Yeast and other ascomycetes characteristically produce ascospores. Chlamydomonas is an alga and conidia are not found in algae. Ginger propagates by rhizome not by sucker. Onion propagates by bulb which is an underground, modified stem.

Answer: (b)

Answer: (b)