LATIHAN BIOLOGI TING 4

1.Figure below shows human’s cheek cell observed through an electron microscope.
Rajah di bawah menunjukkan sel pipi manusia di bawah mikroskop elektron.

PS
R
Q

(a) Name the structure labeled P and Q.
(b) (i) Namakan struktur berlabel P dan Q.

P:

Q:
[ 2 marks/ markah]

Cheek cell and onion epidermal cells are observed under light microscope.
Draw a labeled diagram of an onion epidermal cell observed under the light microscope.
Sel pipi dan sel epidermis bawang dilihat di bawah mikroskop cahaya. Lukiskan gambar rajah
berlabel untuk sel epidermis bawang yang dilihat di bawah mikroskop cahaya.

[ 2 marks/ markah]
(ii) State two differences in structure between a cheek cell and an onion epidermal cell that is observed

under the microscope.
Nyatakan dua perbezaan antara struktur sel pipi dan sel epidermis bawang yang dilihat di bawah
mikroskop.

[ 2 marks/ markah]

(c) If structure R is removed from a cell. Explain what would happen to the growth of the cell.
Jika struktur R dibuang daripada sel. Terangkan apakah yang akan berlaku kepada tumbesaran sel.

[ 2 marks/ markah]

(d) Explain why meristematic cells have more organelle S compared to cheek cells.
Terangkan mengapa sel meristem mempunyai lebih banyak organel S berbanding sel pipi.

[ 2 marks/ markah]

2.Diagram below shows a structure of cell P that were seen under a microscope.
Rajah di bawah menunjukkan struktur sel P yang dapat dilihat di bawah mikroskop.

Cells P
Sel-sel P

(a) (i) Name cell P. [ 1 mark/ markah]
Namakan sel P. [ 1 mark/ markah]

(ii) State one function of cell P.
Nyatakan satu fungsi P.

(b) Cell P is immersed in a concentrated salt solution.
Sel P telah direndamkan dalam larutan garam yang pekat.

(i) Draw a diagram to show the condition of cell P after 20 minutes.
Lukis rajah untuk menunjukkan keadaan P selepas 20 minit.

[ 2 marks/ markah]

(ii) Explain what had happened to cell P in (b)(i).
Terangkan apakah yang telah berlaku pada sel P di (b)(i).

[ 3 marks/ markah]

(c) Diagram below shows the structure of a plasma membrane of cell P.
Rajah di bawah menunjukkan struktur membran plasma.

Q

(i) Name layer Q. [ 1 mark/ markah]
Namakan lapisan Q. [ 1 mark/ markah]

(ii) State the main component of layer Q.
Nyatakan komponen utama bagi lapisan Q.

(iii) Cells P is mixed with detergent. The detergent dissolves lipids.
After 10 minutes, the mixture is examined under a microscope, no cells P were seen but the
mixture turn red and cloudy.
Explain why.
Sel P telah dicampurkan dengan bahan pencuci. Bahan pencuci tersebut melarutkan lemak.
Selepas 10 minit, campuran tersebut telah diperiksa di bawah mikroskop. Tiada sel P yang
dapat diperhatikan tetapi campuran tersebut telah menjadi merah keruh.
Terangkan kenapa.

[ 3 marks/ markah]

3.Diagram (a) and (b) below show two different types of movement of substances across the plasma membrane.
Rajah (a) dan (b) di bawah menunujukkan dua jenis pergerakan badan yang berbeza bagi bahan merentasi
membran plasma.

Diagram (a)
Rajah (b)

Diagram (b)
Rajah (b)

(a) In diagram (a), label the following structures:
Pada rajah (a), labelkan struktur-struktur berikut:

Phospholipid bilayer, c :Phospholipid bylayer with letter P
:Dwilapisan fosfolipid, dengan huruf P

Carrier protein, with let :Carrier protein with letter Q
:Protein pembawa, dengan huruf Q

[ 2 marks/ markah]

(b) The plasma membrane is said to be semi-permeable. What is the meaning of semi-permeable membrane?
Membran plasma dikatakan bersifat separa telap. Apakah maksud membran separa telap?

[ 1 mark/ markah]

(c) Name the process of movement of substances across the plasma membrane as shown in diagram (a) and
(b).
Namakan proses pergerakan bahan merentasi membrane plasma yang ditunjukkan pada rajah (a) dan (b).

Process in diagram (a)/proses dalam rajah (a)

Process in diagram (b)/proses dalam rajah (b)

[ 2 marks/ markah]

(d) (i) Explain how amino acid molecules are transported across the plasma membrane by the process
shown in diagram (a).
Terangkan bagaimana molekul asid amino diangkut merentasi membran plasma melalui proses
yang ditunjukkan pada rajah (a)

[ 2 marks/ markah]

(ii) Based on diagram (b), state one example of a substance that moves across the plasma membrane.
Describe the characteristics of that substance transported into the cell.
Berdasarkan rajah (b), nyatakan satu contoh bahan yang bergerak merentas membran plasma.
Huraikan ciri-ciri bahan tersebut.

(e) Explain the concept of osmosis in the preservation of cucumbers. [ 2 marks/ markah]
Terangkan konsep osmosis dalam pengawetan timun. [ 3 marks/ markah]