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Life Processes - 2 (Class X)

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The energy derived from the food we eat is stored in our body in the form of

  1. glucose

  2. starch

  3. carbon

  4. glycogen

  5. carbohydrates


Correct Option: D
Explanation:

This is the correct answer. The energy derived from the food we eat is stored in our body in the form of glycogen.

Which of the following statements is/are correct?

a. In saprophytic nutrition, the organisms obtain their food from dead and decaying organic matter of dead plants, dead animals and other decaying matter. b. In parasitic nutrition, an organism (parasite) lives on the body surface or inside the body of another organism (known as a host) to derive its nutrition. c. In holozoic nutrition, the organism undergoes the process of internalization (ingestion) and internal processing of liquids or solid food particles.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. c only


Correct Option: A
Explanation:

This is the correct answer as all the statements regarding the different types of nutrition are correct.

Which of the following glands are associated with and form a part of the human digestive system?

a. Salivary glands b. Liver c. Pineal gland d. Pancreas

  1. a, b, c and d

  2. a, b and c

  3. a, b and d

  4. a, c and d

  5. b, c and d


Correct Option: C
Explanation:

This is the correct answer as salivary glands, liver and pancreas are the glands that are associated with the human digestive system.

Which of the following statements is/are correct?

a. All the gaseous exchange takes place in leaves through stomata for the purpose of photosynthesis. b. The plant closes the stomata when it does not need carbon dioxide for photosynthesis as large amount of oxygen is lost through them. c. The opening and closing of stomatal pore is a function of guard cells.

  1. only a

  2. only b

  3. only c

  4. a and b

  5. a, b and c


Correct Option: C
Explanation:

This is the correct answer. The opening and closing of stomatal pore is a function of guard cells.

Which of the following is/are autotrophic?

a. Grass b. Algae c. Yeast d. Parmecium

  1. a, b, c and d

  2. a, b and c

  3. a, b and d

  4. a, c and d

  5. a and b


Correct Option: E
Explanation:

This is the correct answer. Grass and algae are autotrophic.

Which of the following pairs is matched correctly?

  1. Pepsin - digests starch

  2. Amylase - breaks down proteins

  3. Bile - breaks fats present in food

  4. Trypsin - breaks starch

  5. Lipase - protects inner lining of stomach


Correct Option: C
Explanation:

This is the correct answer as bile salts are made in liver and they help emulsify or break down the fats or lipids present in the food so that it makes it easy for the enzymes to act and digest them.

Food is churned in the stomach for about three hours and broken into a semi-solid paste. The tubular glands present in the stomach secrete gastric juice. Which of the following substances are contained in this gastric juice?

  1. Amylase, pepsin and mucus

  2. Amylase, hydrochloric acid and mucus

  3. Hydrochloric acid, pepsin and amylase

  4. Mucus, hydrochloric acid and pepsin

  5. Pepsin and hydrochloric acid


Correct Option: D
Explanation:

This is the correct answer. Gastric juices contain hydrochloric acid, pepsin and mucus.

Which of the following statements is/are correct?

a. Dentine is the hardest material in our body. b. Inside the dentine is the pulp cavity that contains nerve cells and blood vessels. c. The formation of cavities in teeth due to acid-forming bacteria is called plaque.

  1. a only

  2. b only

  3. c only

  4. a and b

  5. a and c


Correct Option: B
Explanation:

This is the correct answer as inside the dentine is the pulp cavity that contains nerve cells and blood vessels.

___________ is the site of aerobic respiration in cells.

  1. Cytoplasm

  2. Liposome

  3. Lysosome

  4. Golgi apparatus

  5. Mitochondrion


Correct Option: E
Explanation:

Mitochondria produce energy through cellular respiration. Thus, they are the site of aerobic respiration in cells.

Which of the following statements is/are correct?

a. Rapid breathing supplies more oxygen to body cells for producing more energy. b. Haemoglobin carries oxygen required for respiration. c. Haemoglobin has more affinity for carbon monoxide than oxygen.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. b only


Correct Option: A
Explanation:

This is the correct answer as all statements are correct. Rapid breathing supplies more oxygen to body cells for producing more energy as required in sports etc. Haemoglobin carries oxygen required for respiration. Haemoglobin has more affinity for carbon monoxide than oxygen, which is why if carbon monoxide is inhaled by someone, then it binds very strongly with the haemoglobin in blood and prevents it from carrying oxygen to brain and other parts of the body and causes carbon monoxide poisoning.

Which of the following statements is/are correct?

a. Respiration breaks food by oxidising it and releasing energy. b. Energy produced during respiration is stored in ADP molecules. c. ADP cells have a high energy content.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. a only


Correct Option: E
Explanation:

This is the correct answer. Respiration includes breathing and oxidation of food in the cells. It breaks food by oxidising it and releasing energy.

Which of the following statements is incorrect?

  1. Red blood cells are round and biconcave.

  2. Red blood cells lack nucleus.

  3. Red blood cells live for approximately four months.

  4. Red blood cells manufacture the antibodies that fight infection.

  5. Red blood cells are manufactured in the bone marrow.


Correct Option: D
Explanation:

This statement is incorrect. White blood cells manufacture the antibodies that fight infection. These are also known as the soldiers of the body.

Which of the following help(s) in the coagulation or clotting of blood in a cut or a wound?

  1. Red blood cells

  2. White blood cells

  3. Haemoglobin

  4. Plasma

  5. Platelets


Correct Option: E
Explanation:

This is the correct answer. Platelets help in the coagulation or clotting of blood in a cut or a wound.

Which of the following statements is/are correct?

a. Xylem vessel is a non-living tube which runs like a drainpipe through the plant. b. Tracheids are long, thin, spindle-shaped cells which are the only water-conducting tissues in all plants. c. Xylem translocates food and hormones in plants.

  1. a only

  2. b only

  3. c only

  4. a and b

  5. a, b and c


Correct Option: A
Explanation:

This is the correct answer. Xylem vessel is a non-living tube which runs like a drainpipe through the plant.

Which of the following carries deoxygenated blood to the lungs?

  1. Aorta

  2. Vena cava

  3. Septum

  4. Pulmonary artery

  5. Pulmonary vein


Correct Option: D
Explanation:

Pulmonary artery is the artery carrying blood from the right ventricle of the heart to the lungs for oxygenation.

Which of the following statements is/are correct?

a. The human heart has four chambers, namely the ventricles and the atria. b. The atria pump blood into various organs with high pressure. c. A sheath of tissue called pericardium separates the chambers of the heart.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. a only


Correct Option: E
Explanation:

This is the correct answer as this statement is correct. The human heart has four chambers, namely the ventricles and the atria. The ventricles are the lower chambers and the atria are the upper chambers.

Which of the following statements is incorrect?

  1. Lymphatic system takes part in the nutritive process of the body.

  2. Lymphatic system protects the body by killing the germs drained out of the body tissues.

  3. The lymphatic capillaries contain lymphocytes that clean the lymph and protect the body from disease.

  4. The lymphatic system removes waste products from the body.

  5. Lymph flows in one direction, from the body tissues to the heart.


Correct Option: C
Explanation:

This is the correct answer choice as this statement is incorrect. The lymph capillaries are mainly responsible for the absorption of interstitial fluid from the tissues.

Using which of the following methods do plants get rid of their waste products?

a. Through stomata b. Through lenticles c. Shedding of leaves d. Felling of fruits e. Gums and resins

  1. a, b and c

  2. a, b, c and d

  3. a, b, c, d and e

  4. c and e

  5. a, b, c and e


Correct Option: C
Explanation:

This is the correct answer. Plants get rid of gaseous waste products through stomata in leaves and lenticles in stem. They get rid of stored solid and liquid wastes through shedding of leaves, barks and felling of fruits. They also secrete wastes through gums and resins.

Which of the following statements is/are correct?

a. The renal vein brings in the dirty blood containing the waste substances into the kidneys. b. Ureters are the tubes that carry urine from the kidneys to the bladder. c. Waste material like urea remains in the Bowman's capsule.

  1. a, b and c

  2. a and b

  3. a only

  4. b only

  5. c only


Correct Option: D
Explanation:

This is the correct answer as this statement is correct. Ureters are the tubes that carry urine from the kidneys to the bladder.

Which of the following are produced during anaerobic respiration in unicellular fungus?

a. Ethanol b. Carbon dioxide c. Energy d. Water

  1. a, b, c and d

  2. a, b and c

  3. a and b

  4. b, c and d

  5. b and c


Correct Option: B
Explanation:

This is the correct answer as ethanol, carbon dioxide and energy are produced during anaerobic respiration.

Match the following:

 
Mode of respiration Organism
a. Skin 1. Mussel
b. Spiracles and tracheae 2. Earthworm
c. Gills 3. Grasshopper
  1. a - 2, b - 1, c - 3

  2. a - 2, b - 3, c - 1

  3. a - 3, b - 2, c - 1

  4. a - 3, b - 1, c - 2

  5. a - 1, b - 3, c - 2


Correct Option: B
Explanation:

This is the correct matching. Earthworms use skin to absorb oxygen from air and remove carbon dioxide. Grasshoppers have tiny holes called spiracles on their body and air tubes called tracheae are respiratory organs. Mussels have gills as respiratory organs.

The gaseous exchange in human lungs during the process of respiration takes place in

  1. trachea

  2. larynx

  3. bronchi

  4. alveoli

  5. pleura


Correct Option: D
Explanation:

Oxygen is taken in alveoli and carbon dioxide is also eliminated here. The gaseous exchange takes place in alveoli in lungs.

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