Important Biology MCQs on Hormones, Glands, Enzymes, Digestion & Genetics for Competitive Exams

Which hormone is released in greater amounts during excitement?
Options:
(A) Cortisone
(B) Serotonin
(C) Adrenaline
(D) Estrogen
Answer: (C) Adrenaline

Which hormone is commonly referred to as the “emergency hormone”?
Options:
(A) Adrenaline
(B) Thyroxine
(C) Vasopressin
(D) Insulin
Answer: (A) Adrenaline

Adrenaline belongs to which biological class?
Options:
(A) Hormone
(B) Enzyme
(C) Protein
(D) Fat
Answer: (A) Hormone

Which is the male sex hormone?
Options:
(A) Progesterone
(B) Estrogen
(C) Testosterone
(D) Insulin
Answer: (C) Testosterone

Which gland is found only in females?
Options:
(A) Thyroid
(B) Pituitary
(C) Ovary
(D) Adrenal
Answer: (C) Ovary

Cowper’s glands are part of which system in the human body?
Options:
(A) Digestive
(B) Endocrine
(C) Reproductive
(D) Nervous
Answer: (C) Reproductive

Which hormone stimulates heartbeat?
Options:
(A) Thyroxine
(B) Gastrin
(C) Glycogen
(D) Dopamine
Answer: (A) Thyroxine

Which of the following is the largest endocrine gland?
Options:
(A) Thyroid
(B) Parathyroid
(C) Adrenal
(D) Pituitary
Answer: (A) Thyroid

What is the largest gland in the human body?
Options:
(A) Thyroid
(B) Liver
(C) Kidney
(D) Pancreas
Answer: (B) Liver

Which hormone controls and stimulates the development of mammary glands?
Options:
(A) Pituitary hormone
(B) Thyroid hormone
(C) Estrogen & Progesterone
(D) Adrenal hormone
Answer: (C) Estrogen & Progesterone

Which hormone is considered the emergency hormone in humans?
Options:
(A) Thyroxine
(B) Insulin
(C) Adrenaline
(D) Progesterone
Answer: (C) Adrenaline

Which type of medicine enhances urine secretion?
Options:
(A) Adrenaline
(B) Moduretic
(C) Diuretic
(D) Natriuretic
Answer: (C) Diuretic

Which chemical is released by animals to attract others of the same species?
Options:
(A) Hormones
(B) Nucleic acids
(C) Pheromones
(D) Steroids
Answer: (C) Pheromones

Which gland secretes the enzyme diastase?
Options:
(A) Salivary gland
(B) Stomach
(C) Liver
(D) Pancreas
Answer: (A) Salivary gland

The hormone insulin is secreted by which cells of the pancreas?
Options:
(A) Alpha cells
(B) Delta cells
(C) Nerve cells
(D) Beta cells
Answer: (D) Beta cells

Which cells in the pancreas are responsible for producing insulin?
Options:
(A) Thymus
(B) Estrogen
(C) Corpus epididymis
(D) Islets of Langerhans
Answer: (D) Islets of Langerhans

What substance is stored in the liver as glycogen?
Options:
(A) Intestine
(B) Stomach
(C) Pancreas
(D) Liver
Answer: (D) Liver

Where is bile stored in the human body?
Options:
(A) Gallbladder
(B) Duodenum
(C) Liver
(D) Spleen
Answer: (A) Gallbladder

Which acid is found in gastric juice?
Options:
(A) Hydrochloric acid
(B) Nitric acid
(C) Sulphuric acid
(D) Ascorbic acid
Answer: (A) Hydrochloric acid

What is the name of the membrane that covers the lungs?
Options:
(A) Pleura
(B) Pericardium
(C) Peritoneum
(D) Mesothelium
Answer: (A) Pleura

A person’s eye color (brown, blue, black) is determined by the pigment in the:
Options:
(A) Pupil
(B) Cornea
(C) Iris
(D) Choroid
Answer: (C) Iris

What is an antibiotic?
Options:
(A) Human-made chemical against microbes
(B) Microbial product that inhibits other microbes
(C) Produced by blood cells against bacteria
(D) Product of blood infections
Answer: (B) Microbial product that inhibits other microbes

Allosomes are also known as:
Options:
(A) Cell organelles
(B) Plant hormones
(C) Alleles
(D) Sex chromosomes
Answer: (D) Sex chromosomes

How many chromosomes are found in a normal human cell?
Options:
(A) 23
(B) 46
(C) 22
(D) 48
Answer: (B) 46

Amniocentesis is a technique used for:
Options:
(A) Assessing fetal health
(B) Determining amino acid sequences
(C) Inducing abortion
(D) Artificial insemination
Answer: (A) Assessing fetal health

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