Life Process | Most Probable Exam ready objective Questions ( MCQs) : 1 Mark

1. The image shows the human digestive system.

Digestion of food starts from which organ of the digestive system?
(a) Mouth due to the presence of saliva.
(b) Oesophagus that moves the food in gut.
(c) Stomach that release juices for fat breakdown.
(d) Mouth which helps in mixing food with digestive juices.
[CBSE Question Bank 2022]

Ans. (a) Mouth due to the presence of saliva.

2. Gastric juice is secreted by gastric glands and contains hydrochloric acid, mucus, and pepsin. Which activity will be affected in the absence of hydrochloric acid?
(a) Digestion of proteins.
(b) Digestion of carbohydrates.
(c) Digestion of lipids.
(d) Digestion of starch.
[CBSE Practice Set-2 2023]

Ans. (a) Digestion of proteins.

3. During cellular oxidation of Glucose, ATP is produced along with formation of other products in this reaction. Which of the following events is associated with production of maximum ATP molecules per molecule of Glucose during this process? Synthesis of:
(a) ethanol in yeast.
(b) lactic acid in muscle cells.
(c) carbon dioxide in yeast cells.
(d) carbon dioxide in human cells.
[CBSE SQP 2024]

Ans. (d) carbon dioxide in human cells.

4. During which of the following stages of the circulation of blood in a normal human being, the oxygenated blood is pumped to all parts of the body?
(a) contraction of the left atrium
(b) contraction of left ventricle
(c) relaxation of the right atrium
(d) relaxation of the right ventricle
[CBSE SQP 2024]

Ans. (b) contraction of left ventricle

5. Identify the option that indicates the correct enzyme that is secreted in location (i), (ii) and (iii).

(a) (i)-lipase, (ii)-trypsin, (iii)-pepsin
(b) (i)-amylase, (ii)-pepsin, (iii)-trypsin
(c) (i)-trypsin, (ii)-amylase, (iii)-carboxylase
(d) (i)-permease, (ii)-carboxylase, (iii)-oxidase
[CBSE Term-1 SQP 2021]

Ans. (b) (i)-amylase, (ii)-pepsin, (iii)-trypsin

6. Which of the following adaptations in herbivores helps in digestions of cellulose?
(a) Longer large intestine
(b) Smaller large intestine
(c) Smaller small intestine
(d) Longer small intestine
[CBSE SQP 2024]

Ans. (d) Longer small intestine

7. In the human respiratory system, the path taken by air when we breathe in is:
(a) Nostrils →  Larynx →  Trachea →  Pharynx →  Alveoli
(b) Nostrils →  Trachea →  Larynx →  Pharynx →  Alveoli
(c) Nostrils →  Pharynx →  Larynx →  Trachea →  Alveoli
(d) Nostrils →  Larynx →  Pharynx →  Trachea →  Alveoli  

[CBSE Compartment 2024]

Ans. (c) Nostrils →  Pharynx →  Larynx →  Trachea →  Alveoli

8. Consider the following statements about small intestine and select the one which is NOT correct:
(a) The length of the small intestine in animals differs as it depends on the type of food they eat.
(b) The small intestine is the site of complete digestion of food.
(c) The small intestine receives secretions from liver and pancreas.
(d) The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.
[CBSE 2023]

Ans. (d) The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.

9. The lining of the alimentary canal has certain muscles that contract rhythmically in order to push the food forward. This process is called:
(a) Translocation
(b) Transpiration
(c) Peristalsis
(d) Autotropism

[CBSE Practice Set-2 2023]

10. The image shows a cross section of small intestine.

What will likely to happen if the number of villi increases in the intestine?
(a) Increase in the absorpotion of food.
(b) Fast elimination of waste from the body.
(c) Increase in flow of blood in the small intestine.
(d) Fast breakdown of larger food particles into smaller ones.
[CBSE Question Bank 2022]

Ans. (a) Increase in the absorption of food.