Question

I. Choose the correct option:

1. Soil erosion is fastest in …… climates.

a. hot and dry b. hot and moist c. cold and dry d. all of these

2. Which of these adjustments helps to make the soil fertile?

a. alteration of pH b. aeration c. addition of fertilizers

d. all of these

3. Which of these carries the inhaled air into tiny air bags in human beings?

a. trachea b. bronchi c. bronchioles d. larynx

4. Which of these helps to pull in oxygen-rich air into the lung?

a. expansion of the diaphragm b. relaxation of the diaphragm

c. up and down movement of the ribs d. tracheal tubes​

Answer 1

Answer:

1}hot and humid climate

2}aeration

3]bronchi

4] relaxation of diaphragm

Answer 2

Answer:

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