All Free Biology MCQs with Answers

• A. Penis
• B. Urethra
• C. Sperm duct
• D. Scrotum

Explanation: The structure that surrounds the testicles is the scrotum. The scrotum is a pouch of skin and muscle that houses and protects the testes.

• A. Parthenocarpy
• B. Apomixis
• C. Parthenogenesis
• D. All of these

Explanation: Parthenocarpy leads to the development of fruits without seeds, that means they can not further reproduce.

• A. Internal fertilization with external development in eggs
• B. Internal fertilization and internal development followed by hatching of egg
• C. External fertilization with external development
• D. Internal fertilization with internal development inside female body

Explanation: Viviparous animals are those that have sexual intercourse due to which the sperm and egg cell fuse and form an embryo in the female body.

• A. Parthenocarpy
• B. Parthenogenesis
• C. Vernalization
• D. All of these options are correct

Explanation: In flowering plants, one form of parthenogenesis is called apomixis. Apomixis is a mechanism by which plants can reproduce clonally…

• A. Egg
• B. Sperm
• C. Somatic cell
• D. Gamete

Explanation: In humans, each cell nucleus contains 23 pairs of chromosomes, a total of 46 chromosomes. The first 22 pairs are called autosomes.

• A. Ejaculatory duct
• B. Seminal vesicle
• C. Seminiferous tubules
• D. Epididymis

Explanation: The epididymis is a coiled tube located on the testes where spermatozoa are stored and undergo maturation.

• A. One of both testes are not developed
• B. One or both testes fail to descend into the scrotum
• C. One or both testes are not formed
• D. None of these

Explanation: Cryptorchidism is a condition that affects males and presents itself in the early stages of life however is resolves on its own during the…

• A. Seed dormancy
• B. Fruit ripening
• C. Germination
• D. All of these

Explanation: . Option C is correct since germination is defined as the sprouting of a seed, spore, or other reproductive body, usually after a period…

• A. 20 days
• B. 28 days
• C. 10 days
• D. 40 days

Explanation: Option B is correct since the average length of the menstrual cycle in an adult female is 28 days.Option A is incorrect since the 20-day…

• A. Andropause
• B. Gametopause
• C. Menopause
• D. All of these

Explanation: Menopause is a natural biological process that marks the end of a woman's menstrual cycle.

• A. Sporulation
• B. Apomixis
• C. Fission
• D. All of these

Explanation: Apomixes, Sporulation and Fission are methods that are of asexually reproducing.

• A. Epididymis
• B. Scrotal sacs
• C. Seminal vesicle
• D. Prostate gland

Explanation: Sperm production in the testes takes place in coiled structures called seminiferous tubules.

• A. Anaphase I
• B. Prophase I
• C. Metaphase I
• D. Metaphase II

Explanation: After ovulation, the oocyte is arrested in metaphase of meiosis II until fertilization.

• A. Somatic cell
• B. Egg cell
• C. Sperm cell
• D. Zygote

Explanation: Option B is correct since in animals and especially among vertebrates, a nucleus from somatic cells is removed and introduced into an egg…

• A. Ovaries
• B. Vagina
• C. Fallopian tubes
• D. Uterus

Explanation: Option A is correct since thousands of eggs are found in the ovaries of the female reproductive system.The ovaries are a pair of small…

• A. Gametes
• B. Gonads
• C. Glands
• D. Follicles

Explanation: The primary reproductive organs are gonads, which produce reproductive cells (gametes).

• A. 28 days
• B. 250 days
• C. 280 days
• D. 300 days

Explanation: The gestation period refers to the length of time from conception to birth.

• A. Meiosis
• B. Fertilization
• C. Ovulation
• D. Oogenesis

Explanation: Option D is correct because oogenesis is the process in which the formation of egg cells begins in the developing female fetus.

• A. Ovary
• B. Vagina
• C. Uterine tube
• D. Prostate gland

Explanation: The prostate is located in male reproductive system just below the bladder and in front of the rectum.

• A. Lower than body temperature
• B. Body temperature
• C. Higher than body temperature
• D. All of these

Explanation: Sperm development (spermatogenesis) occurs at a temperature lower than body temperature.