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Life Processes

Description: Life Processes
Number of Questions: 23
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Tags: Life Processes (X) Nutrition in Microbes Human Digestive System Transportation of Food in Plants Transportation of Food and Water in Plants Transportation of Water in Plants
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Which of the following parts of plants is/are involved in the excretion of waste?

a. Leaves b. Stem c. Ripe fruits

  1. a and b

  2. b and c

  3. a and c

  4. a, b and c

  5. a only

Show answer
Correct Option: D
Explanation:

This is the correct answer. Plants also use stomata in leaves to excrete gaseous wastes. 

In which of the following does the absorption of digested food take place?

  1. Stomach wall

  2. Inner surface of the small intestine

  3. Inner surface of the large intestine

  4. Inside the rectum

  5. Inside the liver

Show answer
Correct Option: B
Explanation:

This is the correct answer as villi present in the inner surface of small intestine helps in the rapid absorption of food.

Which of the following statements is/are incorrect?

a. Peristaltic movement moves food in all the digestive organs throughout the alimentary canal. b. Food is churned in stomach for three hours and is partially digested. c. Sphincter muscle moves food in small amounts into the stomach from the food pipe.

  1. a only

  2. b only

  3. c only

  4. a and c

  5. b and c

Show answer
Correct Option: C
Explanation:

This is the correct answer as this statement is incorrect. The exit of food from stomach is regulated by a sphincter muscle, which releases it in small amounts into the small intestine.

Which of the following statements is incorrect?

  1. All parts of a plant perform respiration individually.

  2. Roots of plants take oxygen required for respiration through diffusion.

  3. Oxygen diffuses in root hair and transports to other cells for respiration.

  4. Roots of a land plant respire anaerobically.

  5. There is little transport of respiratory gases during respiration in plants.

Show answer
Correct Option: D
Explanation:

This is the correct answer as this statement is incorrect.

Which of the following statements is/are correct?

a. Tooth enamel is the hardest part in a human body. b. Dentine contains nerves and blood vessels. c. The sticky, yellowish layer of food particles and bacteria on the teeth is called dental caries.

  1. a only

  2. b only

  3. c only

  4. a and b

  5. a and c

Show answer
Correct Option: A
Explanation:

This is the correct answer as only statement a is correct.

The gaseous exchange in human respiratory system takes place in the

  1. larynx

  2. bronchi

  3. trachea

  4. pharynx

  5. alveoli

Show answer
Correct Option: E
Explanation:

This is the correct answer. The gaseous exchange in human respiratory system takes place in the alveoli.

The circulation system depends on the heart as it oxygenates blood which gives energy. Which of the following has a four-chambered heart?

  1. Hen

  2. Snake

  3. Lizard

  4. Frog

  5. Fish

Show answer
Correct Option: A
Explanation:

Birds and mammals have a four-chambered heart.

Which of the following is incorrect about xylem vessels of a plant?

  1. They are living tubes.

  2. They run like a drainpipe through the plant.

  3. They do not contain cytoplasm or nuclei.

  4. Thier walls are made of lignin and cellulose.

  5. They carry water and minerals.

Show answer
Correct Option: A
Explanation:

No, they are non-living tubes.

Which of the following options is correct?

  1. Lymph is a medium of circulation in body.

  2. Lymph flows in one direction.

  3. Subclavian veins carry lymph from the heart.

  4. Both 1 and 2

  5. 1, 2 and 3

Show answer
Correct Option: D
Explanation:

This is the correct answer option as both statements are correct. Lymph is a medium of circulation in body. Lymph flows in one direction from body tissues to the heart.

Which of the following is correct about mucus?

  1. It is alkaline and contains salts which help to emulsify lipids.

  2. It makes the medium of gastric juice acidic so that enzyme pepsin can digest proteins.

  3. It breaks the fats present in food.

  4. It digests starch present in food to form sugar.

  5. It protects stomach wall from its own secretions of hydrochloric acid.

Show answer
Correct Option: E
Explanation:

This is the correct answer. Mucus protects stomach wall from its own secretions of hydrochloric acid.

Which of the following is the correct statement about the large intestine of the human body?

  1. The absorption of food occurs here.

  2. The assimilated food is stored here.

  3. It absorbs water from undigested food.

  4. It stores digested food that is not used immediately by the body.

  5. It stores faeces.

Show answer
Correct Option: C
Explanation:

This is the correct answer as the villi present in the inner surface of the large intestine absorbs most of the water from the undigested food.

Which of the following statements is/are incorrect?

a. Breathing occurs involuntarily in living beings. b. Rate of breathing is controlled by the lungs. c. Haemoglobin present in blood supplies oxygen to the cells.

  1. a only

  2. b only

  3. c only

  4. a and c

  5. b and c

Show answer
Correct Option: B
Explanation:

This is the correct answer as this statement is incorrect. Rate of breathing is controlled by the respiration system of the brain.

Which of the following organs is/are not involved in excretory functions in human beings?

  1. Kidneys

  2. Lungs

  3. Small intestine

  4. Bladder

  5. Rectum

Show answer
Correct Option: C
Explanation:

Small intestine is not an excretory organ. This is the correct answer.

The digestion of carbohydrates begins in the

  1. mouth

  2. oesophagus

  3. stomach

  4. pancreas

  5. small intestine

Show answer
Correct Option: A
Explanation:

This is the correct answer as the digestion of carbohydrates or starch begins in the mouth itself.

Urine in a human body passes out through the

  1. ureter

  2. tubules

  3. renal vein

  4. bladder

  5. urethra

Show answer
Correct Option: E
Explanation:

This is the correct answer as urine passes through the urethra.

__________ contains glands that secrete hydrochloric acid, mucus and enzyme pepsin.

  1. Oesophagus

  2. Stomach wall

  3. Liver

  4. Pancreas

  5. Small intestine

Show answer
Correct Option: B
Explanation:

This is the correct answer. The stomach wall contains three tubular glands that secrete gastric juice that contains hydrochloric acid, mucus and enzyme pepsin.

What is phagocytosis?

  1. The mode of nutrition of amoeba

  2. The process of nutrition of amoeba

  3. The process by which amoeba removes undigested food

  4. The process of obtaining food by amoeba

  5. The process by which amoeba divides into two daughter cells

Show answer
Correct Option: D
Explanation:

This is the correct answer. The process of obtaining food by amoeba is called phagocytosis. It means 'cell feeding'.

Which of the following statements is/are correct?

a. Glucose is the simple food which is oxidised in the cells of organisms during respiration. b. The oxidation of glucose to pyruvic acid does not require oxygen. c. The process of oxidation of glucose to pyruvic acid is called glycolisis.

  1. a, b and c

  2. a and c

  3. b and c

  4. a and b

  5. c only

Show answer
Correct Option: A
Explanation:

This is the correct answer as all statements are correct.

Which of the following does/do not have a nuclei?

a. Platelets b. Red blood cells c. White blood cells

  1. a only

  2. b only

  3. c only

  4. a and b

  5. b and c

Show answer
Correct Option: D
Explanation:

Red blood cells do not have nuclei and they live for approximately four months. They are made very fast in our bone marrow.

Which of the following statements is/are correct?

a. Diffusion is insufficient to meet the oxygen requirements of single-celled organisms. b. Organisms use oxygen sourced from outside the body to use it in the process of breakdown of food sources for cellular needs. c. The maintenance of life requires various life processes like nutrition, respiration, transport of materials within the body and excretion of waste products.

  1. a only

  2. b only

  3. c only

  4. b and c

  5. a and c

Show answer
Correct Option: D
Explanation:

This is the correct answer as both statements b and c are correct.

What is systole?

  1. The contraction of heart

  2. The expansion of heart

  3. The nodes containing lymphocytes

  4. The circulation of extracellular fluid in human body

  5. The rhythmic contraction and relaxation of heart muscles

Show answer
Correct Option: A
Explanation:

This is correct as the phase of heart when it contracts and pumps blood into veins is called systole.

Which of the following statements is/are correct about artificial kidney machine?

a. It treats patients with renal faliure. b. It removes nitrogenous waste products from blood. c. The process of blood filtration through kidney machine is called dialysis.

  1. a only

  2. b only

  3. c only

  4. b and c

  5. a, b and c

Show answer
Correct Option: E
Explanation:

This is the correct answer as all the given statements are correct.

Which of the following organisms do not use a heterotrophic mode of nutrition?

a. Pea plant b. Cuscuta plant c. Fungi d. Amoeba

  1. a only

  2. a and b

  3. a and c

  4. a and d

  5. a, b and d

Show answer
Correct Option: A
Explanation:

This is the correct answer as only pea plant is an autotroph.

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