All Free Biology MCQs with Answers

• A. Fragmentation
• B. Sporulation
• C. Fission
• D. Budding

Explanation: Budding is a form of asexual reproduction where a new organism develops from an outgrowth or bud on the parent organism.

• A. Stem
• B. Root
• C. Leaf
• D. None of the above

Explanation: Sweet potatoes primarily reproduce vegetatively through their roots. The tuberous roots, also known as "slips," are the main method of…

• A. Stem
• B. Root
• C. Leaf
• D. None of the above

Explanation: Vegetative propagation in Bryophyllum mainly occurs through its leaves.

• A. Frog
• B. Fish
• C. Earthworm
• D. Cockroach

Explanation: Earthworms are indeed hermaphrodites. They possess both male and female reproductive organs, allowing them to produce both sperm and eggs.

• A. Yeast
• B. Paramoecium
• C. Plasmodium
• D. Rhizopus

Explanation: Plasmodium, a protoctista and the causative agent of malaria, undergoes multiple fission as part of its life cycle.

• A. Ovarian follicle
• B. Graffian follicle
• C. Corpus luteum
• D. Corpus albicans

Explanation: After ovulation, the Graafian follicle transforms into the corpus luteum.

• A. FSH
• B. Luteinizing hormone
• C. Oestrogen
• D. Progesterone

Explanation: LH is secreted by the anterior pituitary gland. LH surge triggers ovulation.

• A. Same as
• B. Lower than
• C. Higher than
• D. Immaterial to

Explanation: Sperms are produced in the testes, which are located outside the body within the scrotum.

• A. Acrosome
• B. Nucleus
• C. Mid-piece
• D. Tail

Explanation: The acrosome is a structure at the tip of the sperm cell that contains enzymes, including lytic enzymes.

• A. 2 days
• B. 1-3 days
• C. 1-3 weeks
• D. 7 days

Explanation: The range encompasses the typical lifespan of sperm, which is generally considered to be around 1 to 3 days.

• A. Vas deferens
• B. Vas efferens
• C. Epididymis
• D. Bladder

Explanation: The epididymis is a coiled tube located on the back of each testicle where sperm mature and are stored before ejaculation.

• A. Hormones
• B. Glands
• C. Gonads
• D. Prostaglandins

Explanation: The endocrine system is primarily made up of glands because glands are the specialized organs responsible for producing and secreting…

• A. Affects only the reproductive system
• B. Releases hormones into the bloodstream
• C. Competes with the nervous system
• D. Is made up primarily of glands with ducts

Explanation: One of the primary functions of the endocrine system is to release hormones directly into the bloodstream.

• A. Sweat gland
• B. Tear gland
• C. Pituitary gland
• D. All of the above

Explanation: The pituitary gland, often referred to as the "master gland," is a crucial component of the endocrine system.

• A. Hormones
• B. Target cells
• C. Endocrine glands
• D. Exocrine glands

Explanation: The figure shows endocrine glands. Endocrine glands are organs in the body that produce hormones, which regulate various physiological…

• A. C
• B. D
• C. A
• D. F

Explanation: In figure, option F shows parathyroid gland. The parathyroid gland secretes parathyroid hormone (PTH), which helps regulate calcium levels…

• A. To produce sex hormones
• B. To produce thyroxine
• C. To produce insulin and glucagon
• D. To produce thymosin

Explanation: The label H in figure is pancreas. The pancreas produces insulin, which helps regulate blood sugar levels by facilitating the uptake of…

• A. C
• B. D
• C. H
• D. J

Explanation: In the figure, the label C shows pituitary gland. The pituitary gland, often called the "master gland," plays a crucial role in regulating…

• A. Release secretions through ducts
• B. Release hormones
• C. Release secretions directly into the bloodstream
• D. Are found throughout the body

Explanation: Exocrine glands release their secretions through ducts, which are small tubes that transport the secretions to a specific location, such…

• A. Remain outside the target cells
• B. Bind to receptors inside the target cells
• C. Have no target cells
• D. Are made of proteins

Explanation: Steroid hormones bind to receptors inside the target cells. Once inside the cell, they bind to specific receptor proteins located in the…