Respiration grade 7

Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

• alcohol and lactic acid

• alcohol and CO2

• lactic acid and CO2

• lactic acid only

During the process of exhalation, the ribs move

Which are the gases involved in breathing?

• O2 and NO2

• O2 and SO2

• O2 and O3

• O2 and CO2

Name the organ of the body in which the blood is oxygenated.

• Heart

• Lungs

• Liver

• Pancreas

Breathing rate in human beings in normal condition is

• 12-15 times in a minute

• 15-18 times in a minute

• 18-22 times in a minute

• 22-25 times in a minute

The respiration that involves the presence of oxygen is known as

• aerobic respiration

• anaerobic respiration

• active respiration

• passive respiration

Yeast is used in wine and beer industries because it respires

(a) aerobically producing oxygen. (b) aerobically producing alcohol. (c) anaerobically producing alcohol. (d) anaerobically producing CO2.

• aerobically producing oxygen.

• aerobically producing alcohol

• anaerobically producing alcohol

• anaerobically producing CO2.

Fish breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to

• take in oxygen from air.

• take in oxygen dissolved in water

• absorb nutrients present in water

• release waste substances in water

Exchange of gases in the leaves take place with the help of

• Grana

• Stomata

• Epidermis

• Cortex

The nostrils of dolphins and whales are called

• air holes

• gills

• blow holes

• trachea