MCQs on Life Processes

All the living organisms have specific characteristics, distinguishing them from non-living forms. The basic processes of life are six in the count: respiration, nutrition, metabolism, transportation, reproduction, and excretion.

In humans, who lead the most complex form of life, there exist additional requirements such as growth, respiration, differentiation, excretion, and digestion. All processes are interrelated to each other. None of the body parts, starting from the smallest cell to a complete body system, works in isolation. All these functions together, in a manner of fine-tuned balance, for every individual's well-being and to maintain life. Disease like cancer and death represents a disruption of the balance in these life processes.

There are many objective questions on life processes. Let us see a few MCQ of life processes.

Importance of MCQs

In general, the Multiple Choice Questions (MCQs) are recognized as the most useful and widely applicable type of objective test elements. They could measure the most important educational outcomes, such as understanding, knowledge, judgment, and problem-solving.

By preparing these MCQs once after completing every topic, we can attempt the competitive exams like NEET efficiently and effectively.

Let us look at the MCQs on life processes or only life processes MCQs.

1. Lack of oxygen in muscles results in cramps on the cricketers often. Is this result due to ____?

1. Non-conversion of glucose to pyruvate

2. Conversion of pyruvate to glucose

3. Conversion of pyruvate to ethanol

4. Conversion of pyruvate to lactic acid

Answer: Option D

Explanation

Lactic acid is formed in the muscle from the carbohydrates metabolism in the cells. When muscles work hard (such as during the time of exercise), the ament of O2 needed is used for consumption during energy production. Thus O lacks in the muscles. This results in another process, anaerobic metabolism. The process of a product obtaining the energy anaerobically is lactic acid, which is built up in muscles that caused pain. Lactic acid, however, produced helps in the actual healing process.

2. The internal (cellular) energy reserve in autotrophs is called ____?

1. Glycogen

2. Starch

3. Protein

4. Fatty acid

Answer: (b)

Explanation

Using the material in the form of water and carbon dioxide, converted into carbohydrates in the presence of chlorophyll and sunlight. Carbohydrates are utilised to provide energy to the plant. The carbohydrates that are not used immediately are stored in the starch form, which serves as an internal energy reserve to use as and also when required by the plant.

3. During contraction, what prevents the backflow of blood inside the heart?

1. Valves in heart

2. Thick muscular walls of ventricles

3. Thin walls of atria

4. All of the above

Answer: (a)

Explanation

Valves ensure that blood doesn’t flow backward when the ventricles or atria contract. Since the ventricles have to pump blood into various organs with high pressure, they have thicker walls compared to atria. The separation of both the left and right sides blue-black of the heart by valve also helps keep deoxygenated and oxygenated blood from mixing to supply a high amount of oxygen to the body.

4. Identify the event that doesn’t occur in the Photosynthesis in the given list.

1. Oxidation of carbon to as carbon dioxide.

2. Absorption of light energy by the chlorophyll.

3. Reduction of carbon dioxide to carbohydrates.

4. Conversion of light energy into chemical energy.

Answer: (a)

Explanation

Carbon dioxide is used in photosynthesis for food products. The oxidation of carbon compounds occurs in the respiration.

5. Entities exhibiting the properties of both non-living and living are called _____?

1. Lichens

2. Bacteria

3. Diatoms

4. Viruses

Answer: (d)

6. Which of the substances given below are transported by the blood plasma?

1. Carbon dioxide

2. Nitrogenous waste

3. Food

4. All of the above

Answer: (d)

7. Identify the small intestine from the list given below.

1. Carnivore

2. Herbivore

3. both (a) and (b)

4. None of the above

Answer: (a)

8. The chlorophyll is used in photosynthesis for ____?

1. No function.

2. Breaking down the water molecule.

3. Reduction of carbon dioxide.

4. Absorbing light.

Answer: (d)

9. Here, the maximum material exchange between the blood and its surrounding cells takes place.

1. Heart

2. Veins

3. Capillaries

4. Arteries

Answer: (c)

10. The enzymes that are found in the secreted intestinal juice finally convert ____?

1. Proteins to amino acids.

2. Fats into fatty acids and glycerol.

3. Complex carbohydrates into glucose.

4. All the above

Answer: (d)

11. The structure given below guards the opening of the hepatopancreatic duct into the duodenum.

1. Pyloric sphincter

2. Sphincter of Oddi

3. Semilunar valve

4. Ileocaecal valve

Answer: (b)

12. The respiratory pigment in human beings is called ____?

1. Haemoglobin

2. Enzymes

3. Insulin

4. None of these

Answer: (a)

13. Reduction of blood pH will

1. Reduces blood supply to the brain.

2. Reduces the heartbeat rate.

3. Decrease the haemoglobin affinity with oxygen.

4. Releases bicarbonate ions by the liver.

Answer: (c)

14. Pick the correct one from the following.

1. Plasma = Blood – Lymphocytes

2. Lymph = Plasma + RBC + WBC

3. Serum = Blood + Fibrinogen

4. Blood = Plasma + RBC + WBC

Answer: (d)