NCERT Class 10 Chapter 7 Life Process CBSE Board Sample Problems Very Short Answer (For CBSE, ICSE, IAS, NET, NRA 2023)
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Question
In which cell organelle does respiration occur?
Solution
Respiration occurs in the mitochondria of a cell.
Question
Why carbon dioxide is mostly transported in dissolved form?
Solution
Carbon dioxide is more soluble in water than oxygen that՚s why it is transported in soluble form.
Question
Enlist the site of synthesis and storage of bile.
Solution
Site of synthesis-liver, site of storage-Gall bladder.
Question
If salivary amylase is lacking in the saliva, which event in the mouth cavity will be affected?
Solution
Starch breaking down into sugars.
Question
Define photolysis.
Solution
The phenomenon of breaking down of water molecule using solar energy absorbed by chlorophyll molecules is known as photolysis.
Question
Why does lack of oxygen in muscles often lead to cramps among cricketers?
Solution
This s due to the conversion of pyruvate to lactic acid in the absence of oxygen.
Question
Why do the walls of trachea not collapse when there is less air in it?
Solution
Tracheal walls do not collapse when there is less air in it because it is supported by rings of cartilage.
Question
What is ascent of sap?
Solution
Absorbed water from the soil also contain dissolved minerals and hence it is called sap. This sap moves upwards due to the ‘transpiration pull’ developed in the xylem elements. Thus, transportation of sap from roots to the leaves at the top is called ascent of sap.
Question
What is osmoregulation?
Solution
Osmoregulation is the maintenance of optimum concentration of water and salts in the body fluids.
Question
Name the chemical which is used to test starch.
Solution
Ans: Iodine
Question
In photosynthesis, which substances are used up, which are produced and which are necessary, but remain unchanged after the reaction?
Used up | Produced | Remain Unchanged | |
A | Carbon dioxide | Water | Oxygen |
B | Chlorophyll | Carbon dioxide | Water |
C | Oxygen | Starch | Cellulose |
d | Water | Oxygen | Chlorophyll |
Solution
Ans: (d) Used up-Water, Produced-Oxygen, Remain Unchanged-Chlorophyll
Question
In the following questions, a statement of assertion (A) is followed by a statement of reason (R) . Mark the correct choice as:
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A) .
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A) .
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true.
Assertion: Transpiration cools leaf surface.
Reason: Transpiration helps in translocation of sugar in plants.
Solution
Ans: (3)
Question
In the following questions, a statement of assertion (A) is followed by a statement of reason (R) . Mark the correct choice as:
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A) .
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A) .
Assertion (A) is true but reason (R) is false.
Assertion (A) is false but reason (R) is true …
Assertion: Villi are present on the internal wall of intestine.
Reason: Villi absorb digested food.
Solution
Ans: (1 ′ )
Question
Choose the correct option.
What is the mode of nutrition in fungi?
a) Autotrophic
(b) Heterotrophic
(c) Saprophytic
(d) Parasitic
Solution
Ans: (c) Saprophytic
Question
Choose the correct option.
Vocal cords occur in:
a) pharynx
(b) Glottis
(c) Bronchial tube
(d) Larynx
Solution
Ans: (d) larynx
Question
Fill in the blanks:
Ultra filtration takes place in ________ ________ of the nephron.
Solution
Ans: Glomerulus
Question
Fill in the blanks:
________ is involved in breakdown of glucose to produce energy for metabolic activities in a cell.
Solution
Ans - Mitochondria
Question
What happens to the glucose present in the filtrate when it reaches the proximal convoluted tubules?
Solution
The glucose present in the filtrate is reabsorbed when it reaches the proximal convoluted tubules