Biology Worksheet.

Name:Form: 4

1 Diagram 1.1 shows organelles Q, R and S that are found in a cell.Rajah 1.1 menunjukkan organel Q, R dan S yang terdapat dalam sel.

Diagram 1.1

(a)(i) Name R.Namakan R.

R: ………………………………….………………………………….………………….... [1 mark]

(ii) State the function of organelles Q and S.Nyatakan fungsi organel Q dan S.

Q : ………………………………………………………………………………………....

S : …………………………….………………………………………………………….... [2 marks]

(b)(i) Name an organ in human where organelles R are abundantly found.Namakan organ manusia dimana organel R dijumpai dengan banyaknya.

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Q

R S

(ii) Explain the role of organelles R to human.Terangkan peranan organel R kepada manusia..

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(c) Diagram 1.2 shows structure T which contains a large number of Q.Rajah 1.2 menunjukkan struktur T yang mengandungi organel Q dalam jumlah yang banyak.

Diagram 1.2

(i) Explain why cell T has a large number of Q.Terangkan mengapa sel T mengandungi banyak organel Q.

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(ii) Q are absent in the sperm.

Explain the effect of the absence of Q to the function of sperms.Q tidak hadir dalam sperma. Terangkan kesan ketidakhadiran Q terhadap fungsi sperma.

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T

[2 marks]

2 Diagram 2 shows cell X and cell Y during prophase stage for both type of cell division.Rajah 2 menunjukkan sel X dan sel Y dalam peringkat profasa bagi kedua-dua jenis pembahagian sel.

Cell X Cell Y

Diagram 2

(a) (i) Which cell undergoes meiosis?Sel yang manakah mengalami meiosis?

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(ii) State the reasons for your answer in (a)(i).Nyatakan alasan bagi jawapan anda pada (a)(i).

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b) (i) Draw the anaphase stage for cell X.Lukiskan peringkat anafasa bagi sel X.

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T

[2 marks](ii) State one difference between anaphase in cell X and anaphase I in cell Y.

Nyatakan satu perbezaan antara peringkat anafasa pada sel X dan anafasa I pada sel Y.

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(c) (i) Name a process that occurs at the part labeled T in cell Y. Namakan satu proses yang berlaku pada bahagian berlabel T dalam sel Y.

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[1mark]

(ii) Explain how the process in (c)(i) play a role in producing variation in organisms. Terangkan bagaimana proses di (c)(i) berperanan dalam menghasilkan variasi dalam organisma.

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(d) (i) State the number of chromosomes in the daughter cells for each cell X and cell Y. Nyatakan bilangan kromosom dalam sel anak bagi sel X dan sel Y.

X: ..............................................................................................................................................

Y: ..............................................................................................................................................

[2 marks]

(ii) Explain your answer in (d) (i) Jelaskan jawapan anda dalam (d) (i)

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Process MProses M

Enzyme XEnzim X

Lipid

GlycerolGliserol

Y

Process MProses M

+ water+ air

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[1 mark]3 Diagram 3.1 shows process M that occurs in the duodenum.

Rajah 3.1 menunjukkan proses M yang berlaku di dalam duodenum.

Diagram 3.1

(a) Name process M and enzyme X.Namakan proses M dan enzim X.

M: .........................................................................................................................................

X : .........................................................................................................................................[2 marks]

(b)(i) Based on your answer in b(i), draw a graph to show the effect of temperature on the activity of enzyme X.Berdasarkan jawapan anda di b(i), lukiskan graf untuk menunjukkan kesan tindak balas enzim X pada suhu optimumnya.

[2 mark]

5Temperature suhu

Rate of reactionKadar tindak balas

10°C 20°C 30°C 40°C 50°C

(b)(ii) What is the optimum temperature for this reaction to take place?

Apakah suhu optimum bagi tindak balas ini?

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(c)(i) Y is the product from the enzymatic reaction shown in Diagram 3.1.What is Y?Y adalah hasil tindakbalas enzim yang ditunjukkan dalam Rajah 3.1.Apakah Y?

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(ii) Explain the consequences of taking food with high content of Y for a long period.Terangkan kesan pengambilan makanan yang mengandungi Y dalam kuantiti yang tinggi dalam jangka masa panjang.

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(d) A student carried out an experiment using enzyme X reaction. He replaced lipid with maltose as the substrate. At the end of the experiment, he observed that there was no reaction.Seorang pelajar menjalankan satu eksperimen dengan menggunakan enzim X. Dia menggantikan lipid dengan maltosa sebagai substrat. Pada akhir eksperimen, dia mendapati tindak balas tidak berlaku.

Based on the lock and key hypothesis, explain the above statement.Berdasarkan hipotesis mangga dan kunci, terangkan pernyataan di atas.

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[4 marks]

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