Respiration in Organisms quiz

Anaerobic respiration in yeast produces:

Lactic acid in muscles causes:

Earthworms breathe through their:

During inhalation the diaphragm:

The normal breathing rate of an adult at rest is about:

Exhaled air turns lime water milky because it contains more:

Fish breathe using:

In plants, leaves exchange gases through:

Cockroaches take in air through:

Aerobic respiration requires:

Why do we feel hungry after physical activity? (2 marks)

Why are the nasal passages lined with hair and mucus? (2 marks)

Why does a frog have moist skin? (2 marks)

How do roots of plants get oxygen? (2 marks)

What is the difference between breathing and respiration? (2 marks)

Why do we cover our nose while sneezing? (2 marks)

Why does an earthworm come out of the soil after heavy rain? (2 marks)

Name the products of aerobic respiration. (2 marks)

Why is smoking harmful to the lungs? (2 marks)

Which organisms can survive without oxygen? Name two. (2 marks)

Ravi's breathing rate was 16 per minute at rest, 24 after a brisk walk and 30 after running. Find the increase after walking and running and the percentage increase after running. (3 marks)

A person breathes 16 times a minute and takes in about 0.5 litre of air each time. Find the volume of air breathed in per minute and per hour. (3 marks)

Inhaled air contains about 21 percent oxygen and 0.04 percent carbon dioxide; exhaled air contains about 16 percent oxygen and 4.4 percent carbon dioxide. Find the change in each gas. How many times more carbon dioxide does exhaled air contain? (3 marks)

In a class of 40 students, breathing rates after exercise were recorded. 10 students had 22, 20 students had 24 and 10 students had 26 breaths per minute. Find the average breathing rate. (3 marks)

A diver's cylinder holds 2400 litres of air. If he uses 20 litres per minute, how long will it last? If he must surface with 20 percent left, for how many minutes can he stay underwater? (3 marks)

Read the passage and answer the questions. After running a race, Paheli felt pain in her leg muscles and was breathing very fast. (i) Why was she breathing fast? (ii) What caused the muscle pain? (iii) How can the pain be relieved? (5 marks)

Read the passage and answer the questions. A baker mixed yeast and sugar with flour and kept the dough in a warm place. After a few hours, the dough had swollen. (i) Why did the dough swell? (ii) What type of respiration occurred? (iii) Why was it kept warm? (5 marks)

Read the passage and answer the questions. A potted plant was watered heavily every day. After some days, its leaves turned yellow and it began to wilt. (i) Why did the plant suffer? (ii) How do roots normally get air? (iii) What should be done? (5 marks)

Read the passage and answer the questions. Boojho observed a cockroach and noticed small holes on the sides of its body. (i) What are these holes called? (ii) What is their function? (iii) Name the tubes connected to them. (5 marks)

Read the passage and answer the questions. A student made a model with a plastic bottle, two balloons inside joined to a Y-tube, and a rubber sheet at the bottom. (i) What do the balloons represent? (ii) What does the rubber sheet represent? (iii) What happens to the balloons when the sheet is pulled down? Why? (5 marks)

Draw a labelled diagram of the human respiratory system and explain the path of air from the nostrils to the lungs. (6 marks)

Explain the mechanism of breathing with diagrams showing inhalation and exhalation. (6 marks)

Describe an experiment to show that we exhale carbon dioxide. Draw the set-up and explain the result. (6 marks)

Explain breathing in cockroach, earthworm and fish with labelled diagrams. (6 marks)

Compare aerobic and anaerobic respiration on five points and give an example of each. Describe an experiment to show that germinating seeds release carbon dioxide. (6 marks)