Practice MCQ Questions and answers on Biology-GK

1

Which statement regarding the mammalian heart is correct?

A) Blood is pumped from the heart via the atria B) Oxygen-loaded blood moves only through the right side of the heart C) When the right atrium contracts, it forces blood into the left atrium D) In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs

Discuss

Answer & Solution

Answer: Option D

Solution:

In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs.

2

An individual whose blood type is B may in an emergency, donate blood to a person whose blood type is

A) B or A B) AB or A C) A or O D) AB or B

Discuss

Answer & Solution

Answer: Option D

Solution:

An individual whose blood type is B may in an emergency, donate blood to a person whose blood type is AB or B.

3

Which of the following carries oxygen to various parts of human body?

A) Red blood cells B) White blood cells C) Plasma D) Nerves

Discuss

Answer & Solution

Answer: Option A

Solution:

Hemoglobin is the protein inside red blood cells that carries oxygen to various parts of human body.

4

Instrument used to measure blood pressure is

A) E.C.G B) Stetheoscope C) sphygmomanometer D) Arm band

Discuss

Answer & Solution

Answer: Option C

Solution:

You can measure your blood pressure on your own using a digital blood pressure monitor for automated readings or an instrument called a sphygmomanometer for manual readings.

5

Lymph carries digested and absorbed fat from ________ .

A) Lungs B) Intestine C) Stomach D) Kidney

Discuss

Answer & Solution

Answer: Option B

Solution:

Lymph carries digested and absorbed fat from intestine and drains excess fluid from extra cellular space back into the blood.

6

Haemoglobin is an important component of

A) RBC B) WBC C) Platletes D) Cytoplasm

Discuss

Answer & Solution

Answer: Option A

Solution:

Hemoglobin is the most important component of red blood cells. It is composed of a protein called heme, which binds oxygen. In the lungs, oxygen is exchanged for carbon dioxide.

7

Hemoglobin, the oxygen carrying substance in red blood cells, is a

A) Nuclei acid B) Carbohydrates C) Fats D) Proteins

Discuss

Answer & Solution

Answer: Option D

Solution:

Hemoglobin (Hgb) is an important protein in the red blood cells that carries oxygen from the lungs to all parts of our body. The main job of white blood cells, or leukocytes, is to fight infection.

8

What carries blood back to the heart?

A) Veins B) Arteries C) Both A & B D) None

Discuss

Answer & Solution

Answer: Option A

Solution:

The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart.

9

The smallest blood vessels which are one-cell thick, are called ________

A) Vena cava B) Arteries C) Veins D) Capillaries

Discuss

Answer & Solution

Answer: Option D

Solution:

A capillary is a small blood vessel from 5 to 10 micrometres (μm) in diameter, and having a wall one endothelial cell thick. They are the smallest blood vessels in the body: they convey blood between the arterioles and venules.

10

Name the blood cells in which nucleus is absent.

A) Lymphocytes B) Blood Platelets C) Monocytes D) Eosinophils

Discuss

Answer & Solution

Answer: Option B

Solution:

Blood Platelets doesn't have a nucleus.