Question

1. Which of the following increases when muscle cells are lacking in oxygen?

a) Carbon dioxide b) lactose c) lactic acid d) uric acid

2. Which of the following statements are true about respiration?

i) During inhalation ribs move inward and diaphragm is raised

ii) The gaseous exchange takes place in the alveoli

iii) Haemoglobin has greater affinity for carbon dioxide than oxygen

iv) Alveoli increases surface area for the exchange of gases

a) (i) and (iv) b) (ii) and (iii) c) (i) and (iii) d) (ii) and (iv)

3. Which blood vessel does not carry any carbon dioxide?

a) pulmonary artery b) vena cava c) hepatic vein d) pulmonary vein

4. The inner lining of stomach is protected by one of the following from

hydrochloric acid. Choose the correct one

(a) Pepsin (b) Mucus (c) Salivary amylase (d) Bile

5. Trypsin and pepsin are secreted respectively by:

(a) liver and pancreas (b) stomach and intestinal glands

(c) Salivary glands and stomach (d) pancreas and stomach

6. The internal energy stored in human being is in the form of :

a) glucose b) glycogen c) starch d) all of the above.

7. Most of the plants absorb nitrogen in one of the following forms. This is:

a) Atmospheric nitrogen b) Urea c) nitrates and nitrites d) proteins

8. Which of the following is not produced during anaerobic respiration in

unicellular organism?

a) Alcohol b) Water c) Carbon dioxide d) ATP

9. The component of blood which makes the chemicals known as antibodies is:

a) Platelets b) leucocytes c) erythocytes d) Basophils​

Answer 1

Explanation:

1) lactic acid

2) water

3) I think the third answer should be WBC

hope it helps you..