Can anyone tell me 10 to 20 MCQ questions on the chapter Respiration In Organisms ( CLASS 7 ) NO IRRELEVANT ANSWERS OTHERWISE REPORTED...
Answers
Answer:
A precaution is an action taken in advance to prevent something negative from happening or to lessen the impact of the negative thing if it does happen. This sense of precaution is often used with the verb take, as in take precautions or take every precaution.
Explanation:
ɪ ʜᴏᴘᴇ ɪᴛ ɪꜱ ʜᴇʟᴘꜰᴜʟ ꜰᴏʀ ʏᴏᴜ
Answer:
sis I have tried to unblock u but they r saying...
Explanation:
Multiple Choice Questions
1. Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?
(a) alcohol and lactic acid
(b) alcohol and CO2
(c) lactic acid and CO2
(d) lactic acid only
Soln:
The answer is (d) lactic acid only
Explanation:
During exercise oxygen gets used up faster, to meet the energy requirement our body shifts to anaerobic respiration because of which lactic acid is produced in place of pyruvic acid.
2. Yeast is used in the wine and beer industries because it respires
(a) aerobically producing oxygen.
(b) aerobically producing alcohol.
(c) anaerobically producing alcohol.
(d) anaerobically producing CO2.
Soln:
The answer is (c) anaerobically producing alcohol.
Explanation:
Yeast respires anaerobically to produce ethanol and CO2. Due to this property, it is used in the production of ethanol and alcoholic drinks.
3. During the process of exhalation, the ribs move
(a) down and inwards.
(b) up and inwards.
(c) down and outwards.
(d) up and outward.
Soln:
The answer is (a) down and inwards.
Explanation:
During exhalation, the diaphragm moves up and ribs move downwards and inwards, decreasing the space in the chest cavity, this increases the air pressure inside the lungs and forces the air out of the lungs.
4. Breathing is a process that
(i) provides O2 to the body.
(ii) breaks down food to release energy.
(iii) helps the body to get rid of CO2.
(iv) produces water in the cells.
Which of the following gives the correct combination of functions of breathing?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)
Soln:
The answer is (c) (i) and (iii)
Explanation:
Breathing is a process oxygen-rich air is taken inside the body and carbon-di-oxide rich air is expelled from the body with the help of respiratory organs.
5. Fish breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to
(a) take in oxygen from the air.
(b) take in oxygen dissolved in water.
(c) absorb nutrients present in water.
(d) release waste substances in water.
Soln:
The answer is (b) take in oxygen dissolved in water.
Explanation:
Fishes use gills for the exchange of gases. As the water enters through mouth it flows through gills. Capillaries in the gills absorb oxygen dissolved in water and also help in expelling out CO2 from the body.
