Free Sexual Reproduction In Flowering Plants (Daily Quiz: 13) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Answer: (b)

Male gametophyte of angiosperms is microspore. Microspore is haploid, uninucleate, minute spores produced in large numbers as a result of meiosis in microspore mother cell inside the microsporangia. These are the first cell of gametophytic generations in angiosperms.

Answer: (b)

False fruit are those fruits in which addition to ovary other floral parts (like thalamus) also contribute for its development is called false fruits. Examples– apple, pear, strawberry and cashew nut. In the given figure of false fruit (apple), the structure marked as A, B, C and D are respectively thalamus, seed, endocarp and mesocarp. Thalamus is a receptacle of a flower in which the embryo fruits and later the seeds are held. Seed is a fertilized and ripened ovule and the characteristics of gymnosperms and angiosperms. Endocarp is the innermost layer of the pericarp which surrounds a seed in a fruit. It may be membranous (as in apples) or woody (as in the stone of a peach or cherry). Mesocarp is the middle layer of the pericarp of a fruit, between the endocarp and the exocarp.

Answer: (d)

In the cytoplasm of the synergid pollen tube releases the two male gametes. After reaching ovary the poller tube enters the ovule. One of these male gametes fuses with egg to form diploid zygote (2n) while the other uses with two polar nucles of the central cell to produce triploid primary endosperm cell (PEC) (3n). So, in some angiosperms these two types of fusion occur in the same embryo sac. This phenomenon is called double fertilization.