Question

1. Breaking down of food without using oxygen is called
(a)Dehydration
(b)Aerobic respiration
(c)Anaerobic respiration
(d)Decomposition

2. Gills are respiratory organs in
(a)Fish
(b)Earthworm
(c)Amoeba
(d)Cockroach

3. What is the end product of glucose in the absence of oxygen in muscle cells
(a)Carbon dioxide
(b)Lactic acid
(c)Ethanol
(d) Water​

Answer 1

Answer:

1) anaerobic respiration

2) fish

3) lactic acid

Answer 2

1. Breaking down of food without using oxygen is called Anaerobic respiration.
2. Gills are respiratory organs of Fish.
3. The end product of glucose in the absence of oxygen in muscles is Lactic acid.

Explanation:

• Breaking down of food without using oxygen is called Anaerobic respiration.

Anaerobic respiration is a mode of respiration among certain organisms, where they break down food into simpler compounds in the absence of oxygen.

• Gills are respiratory organs of Fish.

Gills are slit like organs present on the lateral sides of the body of the organism. Fishes derive oxygen from the water, water is taken in through the mouth and excess water with unwanted and respiratory by-products are let out through the gills of fishes.

• The end product of glucose in the absence of oxygen in muscles is Lactic acid.

Glucose is broken down to form pyruvate as end product and  molecules of Adenosine Triphosphate (ATP) are released. ATP molecules produce energy for the body to function.

But in the absence of oxygen in the muscles, glucose is broken down to form lactic acid. A kind of  Anaerobic respiration takes place and the pyruvate produced by the glucose is fermented to form lactic acid. Lactic acid is produced to have a continuous production of ATP, so as to help the body to carry on the metabolic activities.