FREE NEET Biology Practice MCQ Test: Sexual Reproduction In Flowering Plants Exercise 4 Questions Answers With Detailed Explanations [PDF]

Answer: (b)

Male gametophyte is highly reduced in angiosperm and is known as pollen grain. It is 2 or 3-celled.

Answer: (a)

Answer: (b)

Answer: (b)

Answer: (a)

Answer: (b)

Answer: (b)

Autogamy is possible only when anther and stigma are close together and there is synchrony in pollen release and stigma receptivity. As in case of cleistogamous flowers, the flowers remain closed so that anthers and stigmas are never exposed. The flowers undergo only self pollination. No external pollinating agency is required.

Answer: (a)

In some seeds, the endosperm persists in the seed as food storage tissue. Such seeds are called endospermic or albuminous, e.g., castor, maize, wheat, barley, rubber, coconut.

Answer: (c)

The typical and the most common type of embryo sac, found in 80% flowering plants is called Polygonum type of embryosac. It contains 8 nuclei but 7 cells – 3 micropylar, 3 chalazal and one central. It is formed by one meiosis and three mitosis.

Answer: (d)

Answer: (b)

One or more thin areas present in the exine of pollen grain are known as germ pores. The germ pores are apertures in the exine layer of the pollen grain where the sporopollenin is absent. The germ pore helps in the formation of the pollen tube and the release of the male gametes during fertilization. There are usually three germ pores in dicots (tricolpate) and one in monocots (monocolpate).

Answer: (a)

The seed coat develops from integuments originally surrounding the ovule. It is thick and hard in coconut which protects the embryo from mechanical injury and from drying out.

Answer: (d)

Answer: (b)

There is no need for emasculation, if the female parent produces unisexual flowers. The female flower buds are bagged before the flowers open.

When the stigma becomes receptive, pollination is carried out using the desired pollen and the flower rebagged. This protects them from contamination by unwanted pollen grains.

Answer: (d)

Number of meiotic divisions required to produce 200/400 seeds of pea would be 250/500. 200 seeds of pea would be produced from 200 pollen grains and 200 eggs. 200 pollen grains will be formed by 50 microspore mother cell while 200 eggs will be formed by 200 megaspore mother cell so 250/500.

Answer: (c)

Answer: (d)

Microsporangium is surrounded by four wall layers. The outermost layer is epidermis which is followed by endothecium, the middle layer and the innermost layer called tapetum. The three outer layers of microsporangium perform the function of protection and help in dehiscence of anther to release pollen.

Answer: (a)

The formation of seedless fruits without fertilisation is parthenocarpy. The fruits developed from unfertilized ovary are called parthenocarpic fruits.

Answer: (c)

Geitonogamy involves transfer of the pollen from one flower of a plant to the stigma of another flower of the same plant, e.g., in maize. As the pollen has to move from one flower to another flower, it requires a pollinating agent. Yet it is genetically similar to autogamy, as both the flowers of the plant, share the same genotype of the plant.

Answer: (b)