All Free Biology MCQs with Answers

• A. Discourages cross-pollination
• B. Ensures reproduction at suitable times
• C. Ensures that all species flower at the same time
• D. Both (b) and (c)

Explanation: It ensures flowering occurs during favorable seasons.Vernalisation ensures that flowering and seed production happen only when…

• A. Vas deferens
• B. Malpighian tubule system
• C. Seminiferous tubules
• D. Ejaculatory duct
• E. Testicular Duct System

Explanation: Male gametes are produced in the seminiferous tubules in the testis. Each testis consists of a highly complex duct system called the…

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: Pericarp refers to the part of a fruit formed from the wall of the ripened ovary.

• A. Binary fission
• B. Multiple fission
• C. Budding
• D. Regeneration

Explanation: Hydra reproduce asexually by budding. The buds form from the body wall, grow into miniature adults and break away when mature.

• A. Leydig cells
• B. Hensen's node cells
• C. Sertoli cells
• D. Interstitial cells

Explanation: In the male, inhibin B is produced in the testis, principally by the Sertoli cells.

• A. Follicle-stimulating, and luteinizing, estrogen
• B. Estrogen and follicle-stimulating, luteinizing
• C. Luteinizing arid estrogen, follicle-stimulating
• D. Follicle-stimulating and estrogen, luteinizing

Explanation: The pituitary gland releases the follicle-stimulating hormone and luteinizing hormone while ovaries produce estrogen and progesterone.

• A. Synthesis of sperm
• B. Lubrication
• C. Nourishment of sperm
• D. Temperature regulation

Explanation: Explanation for this question will be added soon.

• A. FSH
• B. STH
• C. Oxytocin
• D. LTH

Explanation: The hormone that plays a crucial role in causing the contraction of the uterine walls during the process of birth is oxytocin.

• A. Egg
• B. Ova
• C. Ovum
• D. All of these

Explanation: The female gametes are most commonly referred to as eggs or ova (singular: ovum).

• A. Ovulation
• B. Beginning of menses
• C. Corpus luteum formation
• D. Maturation of ovarian follicle

Explanation: During the menstrual cycle, the level of progesterone in the body increases after ovulation and reaches its peak about one week later.

• A. Nerve cells
• B. Fat cells
• C. Muscle cells
• D. Interstitial cells

Explanation: The cells that secrete testosterone are the Leydig cells, also known as interstitial cells.

• A. Provides liquid medium
• B. Povides protection to sperms
• C. Provides nourishment to sperms
• D. All options are correct

Explanation: Sertoli cells, also known as sustentacular cells, are specialized cells found in the testes of males.

• A. Bag
• B. Scrotum
• C. Pouch
• D. All of these

Explanation: The external genitalia of the human male include the scrotum, which houses a pair of testes.

• A. Testes
• B. Ovaries
• C. Testosterone
• D. Ovum

Explanation: Explanation for this question will be added soon.

• A. Urethra
• B. Seminiferous tubules
• C. Ejaculatory duct
• D. Vas deferens

Explanation: After traveling through the epididymis, sperm cells enter the vas deferens.

• A. Vas deferens
• B. Ureter
• C. Urinary bladder
• D. Urethra

Explanation: Explanation for this question will be added soon.

• A. Progesterone
• B. Chorionic gonadotrophic hormone
• C. FSH
• D. LH

Explanation: Progesterone is the main hormone produced by the corpus luteum. It is responsible for preparing the uterus for pregnancy.

• A. Pigeon
• B. Elephant
• C. Sheep
• D. Humans

Explanation: Option A is correct since oviparous animals are animals that produce young using eggs that are hatched after they have been laid by the…

• A. Ovulation
• B. Conception
• C. Implantation
• D. Menstruation

Explanation: Implantation refers to the zygote geing attached to the wall of the womb so that further stages in the growth of zygote can occur, and…

• A. The lining of the womb wall stays built up.
• B. The lining of the womb wall builds up again.
• C. Another egg is immediately released.
• D. The lining of the womb wall breaks down.

Explanation: If fertilization does not occur, the uterus wall breaks down, menstraution occurs and the body prepares for the next cycle.