Life Science MCQ Questions Answers

  1. Which of the following is a large blood vessel that carries blood away from the heart?

A. Vein

B. Artery

C. Capillary

D. Nerve

Ans. B

Explanation: The pulmonary artery consists of blood from the right aspect of the heart to the lungs to choose up a sparkling supply of oxygen.

  1. Which of the following is not a member of the vitamin B complex?

A. Thiamine

B. Riboflavin

C. Folic acid

D. Ascorbic acid

Ans. D

Explanation: Vitamin B complex consists of 8 vitamins namely B1, B2, B3, B5, B6, B7, B9 and B12. Vitamin B1 is Thiamine, Vit B2 is Riboflavin, Vit B3 is Niacin, Vit B5 is pantothenic acid, Vit B6 is pyridoxine, biotin, folic acid, and Vit B12 is cyanocobalamin.

  1. Fungi are plants that lack……..

A. Oxygen

B. Carbon dioxide

C. Chlorophyll

D. None of these

Ans. C

Explanation: We recognize vegetation prepare their own food and so are called autotrophs. With the assist of photosynthesis, they make meals in which they produce glucose from carbon dioxide and sunlight. Oxygen is released by flora which can be in addition used by people and other animals. however Fungi lack chlorophyll and do now not interact in photosynthesis.

  1. What makes a reptile a reptile?

A. Cold blooded

B. Warm Blooded

C. Non-Hearing

D. Egg-laying

Ans. D

Explanation: Reptiles’ skin is covered with tough, dry scales and most reptiles lay eggs. those animals which are cold-blooded do not mechanically hold a steady body temperature. They must lay out their eggs within the sun to preserve their frame warm.

  1. Which blood vessels have the smallest diameter?

A. Capillaries

B. Arterioles

C. Venules

D. Lymphatic

Ans. A

Explanation: Blood is carried via the frame with the aid of Blood Vessels. With the help of perfusion technique capillaries deliver blood to the tissues. The diameter of the capillary levels from five-10 micrometers. The diameter of the arteriole is approx. 30 micrometer.

What is Blood Pressure and how is it measured?

  1. Which of the following is an air-borne disease?

A. Measles

B. Typhoid

C. Pink eye

D. None of the above

Ans. A

Explanation: Airborne diseases are the infections spread by airborne transmissions including Chickenpox, Anthrax, Influenza, Measles, Smallpox, Cryptococcosis and Tuberculosis.

  1. A yellow dust appears on the fingers, whenever we touch the middle of a flower. These tiny yellow grains are one of the most precious substances in nature because they contain the secret of plant life. What is this dust called?

A. Pollen

B. Sperm

C. Spore

D. Sporocyst

Ans. A

Explanation: The yellow powder is called pollen and the stick that holds it is referred to as stamen.

  1. Which organ of the body produces the fluid known as bile?

A. Liver

B. Pancreas

C. Gall bladder

D. Kidney

Ans. A

Explanation: Liver produces a digestive fluid called bile. Liver releases Bile into Gall Bladder, a small, pear-shaped organ located just under your liver in the top right aspect of your abdomen.

  1. Which of the following hormones is a steroid?

A. Estrogen

B. Glucagon

C. Insulin

D. Oxytocin

Ans. A

Explanation: Steroid hormone is produced by 3 endocrine organs. The testes produce testosterone; the ovaries produce estrogen, and the adrenal cortex produces steroid hormones together with cortisol and aldosterone. Steroid hormones are derived from ldl cholesterol and are lipid-soluble molecules.

  1. Which one of the following is not a function of the liver?

A. Regulation of blood sugar

B. Enzyme activation

C. Detoxification

D. Reproduction

Ans. D

Explanation: The liver is the body’s largest internal organ. It has many functions in the body as it helps in protein synthesis and blood clotting, manufacturing triglycerides and cholesterol, glycogen synthesis, and bile production. It also detoxifies chemicals and metabolizes drugs.

  1. Which of the following is/are the main functions of Lymphocytes?
  2. Produce antibodies
  3. Produce antigens
  4. Produce White Blood Cells

A. Only 1

B. Both 2 and 3

C. Both 1 and 3

D. 1, 2 and 3

Ans. A

Explanation: Globulins are secreted by way of Lymphocytes and are referred to as antibodies. these antibodies help to combat in opposition to pathogens that assault the frame.