Class 10 Science: Nutrition — Practice Questions with Answers

Which of the following are essential requirements for the autotrophic mode of nutrition?

1. carbon dioxide and water
2. chlorophyll
3. sunlight
4. all of the above

A reduced secretion of saliva in the mouth would impact the conversion of which of the following substances? (a) Proteins into amino acids (b) Fats into fatty acids and glycerol (c) Starch into simple sugars (d) Sugars into alcohol

1. Proteins into amino acids
2. Fats into fatty acids and glycerol
3. Starch into simple sugars
4. Sugars into alcohol

What regulates the opening and closing of stomata? (a) CO₂ concentration in stomata (b) Temperature in guard cells (c) O₂ concentration in stomata (d) Amount of water in guard cells

1. CO₂ concentration in stomata
2. Temperature in guard cells
3. O₂ concentration in stomata
4. Amount of water in guard cells

Which essential element is utilized in the synthesis of proteins? (a) Nitrogen (b) Phosphorus (c) Iron (d) Magnesium

1. Nitrogen
2. Phosphorus
3. Iron
4. Magnesium

Which of the following organisms exhibits a parasitic mode of nutrition?

1. Bryophyllum
2. Hibiscus
3. Cuscuta
4. Helianthus

The steps involved in the nutrition of Amoeba are listed below in a jumbled order. Select the option that shows the correct sequence. (i) Diffusion of simple nutrients into cytoplasm (ii) Food vacuole formation (iii) Formation of finger-like temporary extensions of cell surface (iv) Complex substances broken to simpler ones (v) Undigested material thrown out of the cell surface

1. (iv), (i), (ii), (iii), (v)
2. (iii), (iv), (i), (v)
3. (iii), (ii), (iv), (i), (v)
4. (iii), (iv), (i), (ii), (v)

Which combination of digestive juices is secreted by the gastric glands in the human alimentary canal?

1. Bile, Trypsin, Pepsin
2. Hydrochloric acid, Pepsin, Mucus
3. Lipase, Bile, Mucus
4. Salivary amylase, Pepsin, Bile

A stoma closes under which of the following conditions? (i) It needs carbon dioxide for photosynthesis. (ii) It does not need carbon dioxide for photosynthesis. (iii) Water flows out of the guard cells. (iv) Water flows into the guard cells. Select the correct combination of reasons for this process.

1. (i) only
2. (i) and (iii)
3. (ii) and (iii)
4. (ii) and (iv)

In humans, what are the final products into which (i) proteins, (ii) carbohydrates, and (iii) fats are converted upon the completion of digestion?

1. (i) Amino acids, (ii) glucose and (iii) fatty acids
2. (i) Amino acids, (ii) glucose, (iii) fatty acids and glycerol
3. (i) Glucose, (ii) fatty acids and glycerol, (iii) amino acids
4. (i) Sugars, (ii) amino acids, (iii) fatty acids and glycerol

Consider the following statements: Assertion (A): The inner lining of the small intestine possesses numerous finger-like projections known as villi, which are densely supplied with blood vessels. Reason (R): The primary function of these villi is to increase the surface area for the final digestion of food within the small intestine. Choose the correct option from the following: (a) Both (A) and (R) are true and (R) is the correct explanation of (A). (b) Both (A) and (R) are true and (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) (A) is false but (R) is true.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true and (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Identify the organism from the options provided that breaks down food material externally before absorbing it.

1. a plant parasite, Cuscuta
2. an animal parasite, Tapeworm
3. a bacteria, Rhizobium
4. a fungi, Rhizopus

Consider the given statements about the small intestine and select the one which is NOT correct.

1. The length of the small intestine in animals differs depending on the type of food they consume.
2. The small intestine is the site where the digestion of food is completed.
3. The small intestine receives secretions from the liver and pancreas.
4. The villi of the small intestine absorb water from the unabsorbed food before it is removed from the body via the anus.

An experiment was conducted using a healthy potted plant with elongated leaves. Half of one leaf was inserted into a test tube containing KOH and made airtight. The setup was placed in sunlight for two hours, after which the leaf was tested for starch. What is the function of the KOH placed in the test tube?

1. Released water vapours
2. Released CO₂
3. Released O₂
4. Chlorophyll

An experiment was conducted using a healthy potted plant with elongated leaves. Half of one leaf was inserted into a test tube containing KOH and made airtight. The setup was placed in sunlight for two hours, after which the leaf was tested for starch. Based on the results of this activity, what essential factor for photosynthesis is being investigated?

1. Carbon dioxide
2. Oxygen
3. Chlorophyll
4. Water vapour

An experiment was conducted using a healthy potted plant with elongated leaves. Half of one leaf was inserted into a test tube containing KOH and made airtight. The setup was placed in sunlight for two hours, after which the leaf was tested for starch using iodine solution. With which substance does iodine solution produce a blue-black colour?

1. Starch
2. Proteins
3. Glucose
4. Fats