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

Answer: (c)

An aggregate fruit or etaerio is a group of simple fruitlets that develop from free ovaries (apocarpus condition) of a single flower (single gynoecium).

Answer: (d)

Anemophily is an abiotic means of pollination by wind and, being non-directional, a wasteful process as the pollen would reach the stigma through wind is a hit-or-miss affair. During the transit of pollen through wind, a considerable amount of pollen is lost because it never reaches a proper stigma. To stand this loss, anemophilous plants have to produce enormous quantities of pollen. Anemophily is also associated with reduction in the number of ovules per ovary. Some models predict that plants benefit from numerous inexpensive flowers distributed throughout the inflorescence, each with a single ovule or a few ovules. In grasses there is just one ovule per ovary. This is to increase the probability of successful pollination of each ovule.

Answer: (b)

Answer: (d)

The endosperm of gymnosperms is haploid. It is a pre-fertilisation tissue and is equivalent to female gametophyte, hence it is haploid in nature but in angiosperms it is post-fertilization tissue and is generally triploid in nature.

Answer: (a)

Sporopollenin is a major component of the tough outer (exine) walls of spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments. It can withstand environmental extremes and cannot be degraded by enzymes and strong chemical reagents.

Answer: (c)

Honey is made from nectar through a process of regurgitation and evaporation. Honeybees transform saccharides (carbohydrates) into honey by regurgitating it a number of times, until it is partially digested. The bees do the regurgitation and digestion as a group. After the last regurgitation, the aqueous solution is still high in water, the process continues by evaporation of much of the water and enzymatic transformation. Honey is produced by bees as a food source.

Answer: (b)

Answer: (c)

Single ovule in the ovary and flowers packed into inflorescence are characteristics of wind pollinated flowers.

Answer: (c)

Answer: (a)

Answer: (b)

In family cypraceae, only one nucleus (out of 4) remains functional after meiotic division of microspore mother cell(similar to megaspore formation).

Answer: (d)

Answer: (c)

In aquatic plants with emergent flowers e.g., water lily, water hyacinth pollination takes place by wind or insects.

Answer: (c)

Answer: (d)

Sequence of development during the formation of embryo sac is:

Archesporium → Megaspore mother cell → Megaspore → Embryo sac

Answer: (c)

Apomixis is a reproductive process which does not involve gametic fusion. In apomictic flowering plants there is no fertilisation and embryos develop simply by division of a cell of ovule.

Answer: (b)

Both Assertion and Reason are true and Reason is the correct explanation of Assertion. Parthenocarpic fruits are either seedless or contain non-viable seeds. This is because such fruits are formed without fertilisation.

Answer: (d)

Answer: (a)

Answer: (a)