All Free Biology MCQs with Answers
Every Biology question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
19,844 questions · page 809 of 993
- A. People eat more nutritive food, therefore more RBCs are formed
- B. People get pollution free air to breath and more oxygen is available
- C. Atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive
- D. There is more UV radiation which enhances RBC production
Explanation: A. People eat more nutritive food, therefore more RBCs are formed:This statement is not accurate.
Correct answer: Atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive- A. Oxygen
- B. Chloroform
- C. Carbon dioxide
- D. Carbon monoxide.
Explanation: A. The patient has been inhaling polluted air containing unusually high content of oxygen: This statement is not accurate.
Correct answer: Carbon monoxide.- A. Shallower and slow
- B. There is no effect on breathing
- C. Slow and not deep
- D. Faster and deeper.
Explanation: A. When CO2 concentration in blood increases, breathing becomes shallower and slow:This statement is accurate.
Correct answer: Faster and deeper.- A. 2000 kcal
- B. 1000 kcal
- C. 750 kcal
- D. 2800 kcal.
Explanation: A: An average person not doing hard work requires energy per day about 2000 kcal: This statement is accurate.
Correct answer: 2000 kcal- A. Spleen
- B. Liver
- C. Gill
- D. Lung
Explanation: All options are explained below. Option A is correct. a)Spleen: The spleen is a vital organ in the vertebrate circulatory system which…
Correct answer: Spleen- A. With the help of WBCs and blood serum
- B. With the help of platelets and corpuscles
- C. With the help of RBCs and blood plasma
- D. With the help of RBCs and WBCs
Explanation: All options are explained below: a)With the help of WBCs and blood serum: White blood cells (WBCs) primarily play a role in the immune…
Correct answer: With the help of RBCs and blood plasma- A. Increase in number
- B. Decrease in number
- C. Increase in size
- D. Decrease in size
Explanation: All options are explained below: a)Increase in number (Correct Option): This statement is accurate.
Correct answer: Increase in number- A. CO2 is continuously diffused through the tissues and is not allowed to accumulate
- B. In CO2 transport, blood buffers play an important role
- C. CO2 is absorbed by the leucocytes
- D. CO2 combines with water to form H2CO3 which is neutralized by NaCO3 .
Explanation: All options are explained below: a)CO2 is continuously diffused through the tissues and is not allowed to accumulate:This statement is not…
Correct answer: In CO2 transport, blood buffers play an important role- A. In combination with haemoglobin only
- B. Dissolved in blood plasma
- C. In the form of bicarbonate ions
- D. As carbaminohaemoglobin and as carbonic acid
Explanation: All options are explained below: a)in combination with haemoglobin only:This statement is not entirely accurate.
Correct answer: In the form of bicarbonate ions- A. Muscular walls of lung
- B. Diaphragm
- C. Costal muscles
- D. Both (b) and (c).
Explanation: All options are explained below: a) Muscular walls of lung: The walls of the lungs themselves do not play a direct role in governing…
Correct answer: Both (b) and (c).- A. Cerebellum
- B. Medulla oblongata
- C. Cerebral peduncle
- D. The vagus nerve.
Explanation: All options are explained below: a)Cerebellum:The cerebellum is primarily responsible for coordinating motor movements, balance, and…
Correct answer: Medulla oblongata- A. Plasma and Erythrocytes
- B. Plasma
- C. Erythrocytes
- D. Erythrocytes and Leucocytes.
Explanation: All options are explained below: a) plasma and erythrocytes : In this option, it is suggested that carbon dioxide is transported from…
Correct answer: Plasma and Erythrocytes- A. Humans
- B. Frog
- C. Rabbit
- D. Lizard.
Explanation: All options are explained below: a) Humans: In humans, the skin can play a limited role in respiration, but it is not considered an…
Correct answer: Frog- A. Lymphocytes
- B. Blood Plasma
- C. RBC
- D. Leucocytes
Explanation: Therefore, the correct answer to the question "Carbonic anhydrase occurs in" is C) RBC (Red Blood Cells).
Correct answer: RBC- A. 10000
- B. 12000
- C. 15000
- D. 20000
Explanation: 12,000 stomata per square cm are present on the leaf surface in Tobacco plants.
Correct answer: 12000- A. Respiratory exchange
- B. Breathing
- C. Diffusion
- D. Osmosis
Explanation: "The explanation for this question will be added soon!".
Correct answer: Breathing- A. Glottis
- B. Voice-box
- C. Bronchi
- D. Both A and B
Explanation: "The explanation for this question will be added soon!".
Correct answer: Both A and B16178. Pleural membranes cover:
- A. Brain
- B. Heart
- C. Kidneys
- D. Lungs
Explanation: "The explanation for this question will be added soon!".
Correct answer: Lungs- A. Glottis
- B. Vocal cords
- C. Larynx
- D. Epiglottis
Explanation: "The explanation for this question will be added soon!".
Correct answer: Epiglottis- A. Bronchi
- B. Alveoli
- C. Terminal bronchiole
- D. Respiratory bronchiole
Explanation: "The explanation for this question will be added soon!".
Correct answer: Alveoli