Lesson Exercise 5h 13 May

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SEKOLAH MENENGAH SERI TEMASIK  MODEL EXAMINATION  EXERCISES IGCSE 5H EXERCISE NO :2 DATE: 13/5/2016 TIME : 10.50a.m.-11.55 a.m. SUBMISSION DATE: 13/5/2016 T!"#/S$%&!"# : All topics L'a()")* O%+'#&",' : i) To help student prepare for paper 3 of middle year examination Nam' :  Ca :  1 Dun g beetl es live in plac es wher e large herbi vores, suc h as elepha nts, buf fal o or cattle, also live. The beetles collect dung produced by the herbivores and make it into a ball, which they roll away and bury. Th ey la y eg gs on th PREPARED BY : BENJAMIN T EE 1

Transcript of Lesson Exercise 5h 13 May

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SEKOLAH MENENGAH SERI TEMASIK 

  MODEL EXAMINATION

  EXERCISES

IGCSE

5H

EXERCISE NO :2 DATE: 13/5/2016

TIME : 10.50a.m.-11.55 a.m.

SUBMISSION DATE: 13/5/2016

T!"#/S$%&!"# : All topics

L'a()")* O%+'#&",' : i) To help student prepare for paper 3 of middle year

examination

Nam' :  

Ca :   

1 Dung beetles live in places where large herbivores, such as elephants, buffaloor cattle, also live. The beetles collect dung produced by the herbivores and

make it into a ball, which they roll away and bury.

Theylay

eggsonth

PREPARED BY: BENJAMIN TEE 1

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e buried ball of dung, so that when their larvae hatch they can feed on the dung. The adultsalso feed on the dung.

Fig. 1.1 shows a dung beetle rolling a ball of dung.

Fig. 1.1

(a) Dung beetles play an important role in the carbon cycle.

sing the information above, suggest how dung beetles can help a carbon atom inanimal dung to become part of a carbohydrate molecule within a plant.

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(b) The buried dung adds nitrates to the soil.

$%plain how this can help plants to grow better.

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(c) Farmers may use insecticides (pesticides that kill insects) on their land.

(i) $%plain why farmers use insecticides.

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PREPARED BY: BENJAMIN TEE 2

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(ii) sing the information above, e%plain why using insecticides on land where cattle gra'ecould reduce the growth of grass.

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PREPARED BY: BENJAMIN TEE 3

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& Fig. .1 shows a sperm cell.

nucleus

Fig. .1

(a) n Fig. .1, use label lines to label and name two structures that are found in allanimal cells. !&#

(b) *ame the organ in which sperm are produced. !1#

(c) +n investigation was carried out into the o%ygen use and energy use of sperm while they were atrest and while they were swimming.

For each measurement, the researchers calculated the amount of o%ygen and the amountof energy used by 1

- (one thousand million) sperm.

The results are shown in Table .1.

Table .1

o%ygen use units per energy use /oules per 

1- sperm per hour 1

- sperm per hour 

resting sperm   & 0

swimming sperm   1" 10

(i) 2uggest why the researchers measured the o%ygen use and energy use for 1

-

  sperm,rather than for a single sperm.

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(ii) $%plain why more o%ygen is used when the sperm are using more energy.!&#

(iii) 3alculate

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the total power output of a group of 1- swimming sperm.

2tate the formula that you use and show your working.

formula

working

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(iv) 4n order to reach an egg, a human sperm has to swim from the top of the vagina to an oviduct,through a thin layer of li5uid.

$%plain how the shape of the sperm, shown in Fig. .1, reduces the energy re5uired to swim this

distance.

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3.

The smell of food cooking can cause a person6s salivary glands to secrete saliva.

(a)(i)*amethistype

ofresponsetoastimulus.

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(ii) Describe how the information about the smell of the food travels from the nose to the salivaryglands.

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(b) 7hen food has been taken into a person6s mouth, it is chewed by teeth and mi%ed with saliva.

Describe how the molar teeth help in the digestion of food.

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(c) 2aliva contains the en'yme amylase.

7hatis 

an en'yme8 

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