Practice MCQ Questions and answers on Biology-GK

Plankton serves as the best indicator of pollution in a water body.

Surgical methods, also called as sterilisation, are generally advised for the male/female partner as a terminal method to prevent any more pregnancies. Surgical intervention blocks gamete transport and thereby prevent conception. Sterilisation procedure in the male is called as vasectomy and that in the female, tubectomy.

Gene flow means migration of genes from one to another. This gene flow is caused by individuals moving into population.

Oral contraceptives (birth-control pills) are used to prevent pregnancy. Estrogen and progestin are two female sex hormones. Combinations of estrogen and progestin work by preventing ovulation (the release of eggs from the ovaries).

The field of science interested in collecting and analyzing numbers related to population is known as demography.

Surgical procedure in which a small portion of sperm duct is removed and cut end ligated in male is called vasectomy.

The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization. It is triploid (meaning three chromosome sets per nucleus) in most species. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.

Human fertilization is the union of a human egg and sperm, usually occurring in the ampulla of the fallopian tube. The result of this union is the production of a zygote cell, or fertilized egg, initiating prenatal development.

The fimbriae of the uterine tube, also known as fimbriae tubae, are small, finger like projections at the end of the fallopian tubes, through which eggs move from the ovaries to the uterus. The fimbriae are connected to the ovary.

Gestation period in human is 9 month.