NCERT Class VII Science Solutions: Chapter 10-Respiration in Organisms Part 2

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VERY SHORT ANSWER QUESTIONS

Question 7:

Mark the following statements as true or false. Correct the false statements.

  1. Oxygen breaks down glucose outside the cells of organisms.

  2. Frogs can breathe through their skin as well as lungs.

  3. Insects have spiracles on the lower surface of the body.

  4. Exhaled air has more percentage of than inhaled air.

Answer:

  1. False: Oxygen breaks down glucose inside the cells of organisms.

  2. True

  3. False: Insects have spiracles on the sides of the body.

  4. True

Question 8:

Fill in the blanks with suitable words.

  1. The roots of a plant take up oxygen from the ______ trapped between the _______ particles.

  2. Diaphragm forms the ___________ of the chest cavity.

  3. Exchange of gases in the leaves take place with the help of __________.

  4. Cockroaches breathe with the help of air tubes called ____________.

Answer:

  1. The roots of a plant take up oxygen from the air trapped between the soil particles.

  2. Diaphragm forms the floor of the chest cavity.

  3. Exchange of gases in the leaves take place with the help of stomata.

  4. Cockroaches breathe with the help of air tubes called tracheae.

SHORT ANSWER QUESTIONS

Question 9:

Pick the odd-one-out from each of the groups given below on the basis of respiratory organs. Give reason for your answer.

  1. Cockroach, grasshopper, snail, ant

  2. Lizard, cow, earthworm, snake

  3. Crocodile, whale, dolphin, fish

  4. Snake, tadpole. crow, goat

Answer:

Image of Snail, Fish, Tadpole, Earthworm

Snail, Fish, Tadpole, Earthworm

Image of Snail, Fish, Tadpole, Earthworm

  1. Snail, as it does not breathe by means of trachea.

  2. Earthworm, because it breathes through its skin and it does not have lungs.

  3. Fish, as most fish breathe through their gills and do not have lungs.

  4. Tadpole, as it breathes through gills and does not have lungs.

Question 10:

Which gas present in air is essential for aerobic respiration? What is the role of oxygen during respiration?

Answer:

Oxygen present in air is responsible for respiration. The oxygen breaks down food and releases energy.