Match the following: 1. Grasshopper a. Epiglottis 2. Glottis b. Cutaneous 3. Lactic acid c. Spiracles 4. Earthworm d. Anaerobic respiration 5. Gaseous exchange e. Cellular respiration

1 - c Insects have a tracheal system running all along their body, called trachea which opens outside through small openings called spiracles for the exchange of gases. 2 - a The trachea is guarded by an opening called glottis, which gets covered by the epiglottis when we eat or drink. The epiglottis is made of elastic cartilage. 3 - d Anaerobic respiration takes place in our muscle cells in the absence of oxygen. It results in the production of lactic acid ( C O 2 is not produced), which accumulates in the muscles. 4 - b In earthworm and leech, the skin is moist and helps in the exchange of gases. Gaseous exchange through the skin is also known as cutaneous respiration. 5 - e The process of cellular respiration includes the oxygen which reacts with glucose to release energy and form carbon dioxide and water. 1. Grasshopper c. Spiracles 2. Glottis a. Epiglottis 3. Lactic acid d. Anaerobic respiration 4. Earthworm b. Cutaneous 5. Gaseous exchange e. Cellular respiration

Observe the bar graph given below and answer the question that follow: Which of the two X or Y may represent aerobic respiration? Which represents anaerobic respiration?

Based on the given diagram, Y represents aerobic respiration as the energy released more in aerobic respiration. Aerobic respiration occurs in the presence of oxygen. Carbon dioxide and water are the end products. X represents anaerobic respiration. Less energy is released in anaerobic respiration compared to the aerobic respiration. Carbon dioxide and alcohol or lactic acid are the end products.

E M B I B E

Expanded Universal Science 7>Chapter 10 - Respiration in Organisms>ASSESSMENT ZONE>Q C

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7th CBSE

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Nitrogen levels in air remain constant during exhalation and inhalation.

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Important Questions on Respiration in Organisms

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7th CBSE

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Expanded Universal Science 7>Chapter 10 - Respiration in Organisms>ASSESSMENT ZONE>Q C

Lungs are protected within the rib cage.

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7th CBSE

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Expanded Universal Science 7>Chapter 10 - Respiration in Organisms>ASSESSMENT ZONE>Q C

Diaphragm is a bone that helps in breathing.

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7th CBSE

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Expanded Universal Science 7>Chapter 10 - Respiration in Organisms>ASSESSMENT ZONE>Q D

Match the following:

1. Grasshopper	a. Epiglottis
2. Glottis	b. Cutaneous
3. Lactic acid	c. Spiracles
4. Earthworm	d. Anaerobic respiration
5. Gaseous exchange	e. Cellular respiration