Question

5. Which of the following statement(s) is (are) true about respiration?
(i) During inhalation, ribs move inward and diaphragm is raised
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into
blood and carbon dioxide from blood into alveolar air
(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen

(iv) Alveoli increase surface area for exchange of gases
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)
6. A student sets up an experiment to study the importance of nutrition in plants.
Thestudent takes 2 pots, pot 1 and pot 2 each with the same healthy plant. Both the
pots were placed in the garden and watered properly. Pot 1 was kept as such, while
pot 2 was kept in a tight glass box with caustic soda. Caustic soda absorbs carbon
dioxide present in the surrounding. After 2 days, the student observes that the plant
kept in the garden is healthy while the plant placed in container shed leaves and
droops. What is the likely reason for this observation?
(a) lack of nutrients in the soil
(b) absence of oxygen for survival
(c) inability to perform photosynthesis
(d) absorption of light by caustic soda restricting growth.

B. ASSERTION AND REASON:
DIRECTION : The following question consist of two statements -
Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both Assertion and Reason are false.

Answer 1

Explanation:

During inhalation, diaphragm is lowered and ribs move outward resulting in increased volume of lungs so airs rushes in. Exchange of gases occur in alveoli.