Chapter 10 Respiration - Worksheet

Jurongville Secondary School Secondary 3 Express Biology Worksheet Chapter 10: Respiration

Name: _________________________( Class: 3____ 10.1

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Date:__/___/___

Complete the following passage by filling in the blanks

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Oxidation of food occurs in living ________ during the process of __________. The process is a complex series of _________controlled reactions in which ___________ is released in small packets. Oxygen is used up, and ___________ _________ and water are formed as waste products. Because oxygen is used, this process is known as _______ __________. It takes place in _____________, found embedded in cells. Cells that use a lot of energy like __________ fibres contain a lot of mitochondria.

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Food may also be broken down ___________ to release __________ in the absence of ____________. This process is known as _________ _____________. The amount of energy released is _________ compared to that released in __________ respiration. During vigorous exercise, our ___________ respire anaerobically to produce ____________ __________.

10.2

S to Z are structures of the human respiratory system. Arrange them to show the order in which air from outside travels through the respiratory system to reach the gaseous exchange surfaces in the lungs.

S: Bronchioles T: Bronchi

U: Nostrils V: Pharynx

W: Epiglottis X: Larynx

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Y: Trachea Z: Alveoli

10.3

The air we inhale on a cold dry day differs from the air we exhale in the following ways. It contains:

Q: More carbon dioxide R: Less carbon dioxide S: Less water vapour T: More water vapour

U: More oxygen Y: More heat V: Less oxygen Z: Less heat W: More nitrogen X: Same amount of nitrogen

Circle the appropriate letters. 10.4

Answer the following questions in the spaces provided.

(a)

Gaseous exchange occurs by diffusion in the alveoli. For efficient diffusion, a steep diffusion gradient for carbon dioxide and oxygen must be maintained at the gaseous exchange surfaces. Name 2 ways by which this is accomplished. __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________

(b)

Study the following graphs.

(i)

Calculate the rate of breathing before and during exercise. _____________________________________________ _____________________________________________

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(ii)

(iii)

(iv)

(v)

(c)

The depth of breathing (breaths per minute) before and during exercise. _____________________________________________ _____________________________________________ _____________________________________________ By how many times does the rate of breathing increase during exercise? _____________________________________________ _____________________________________________ By how many times does the depth of breathing increase during exercise? _____________________________________________ _____________________________________________ By how many times does the amount of oxygen used by the body increase during exercise? _____________________________________________ _____________________________________________

Study the following experimental setup. Answer the questions that follow.

(i)

The setup was left for 2 days. The stopper of the flask is removed. What substance would you expect to detect? _____________________________________________

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(ii)

What type of respiration was dominant? _____________________________________________

(iii)

Write the overall equation for this respiratory process. _____________________________________________

(iv)

List 3 important differences between cellular respiration and photosynthesis. _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________

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