Skema Jawapan Ujian 1 Tkn 4

PART A (OBJECTIVE QUESTION)

ANSWER :

1. C 11.C

2. B 12.C

3. D 13.D

4. D 14.A

5. B 15.B

6. A 16.C

7. A 17.C

8. B 18.B

9. A 19.D

10.D 20.B

PART B (STRUCTURED QUESTION)

1. a) K = liver

L = stomach 4 correct – 2 m

M = duodenum 2 or 3 correct – 1 m

N = ileum (small intestine – REJECT) 1 only correct – 0 m

b) Cell à Tissue à Organ à System à Organism -------------------------- 1 m

c) Shoot system --------------------------------------------------------------------- 1m

List the organ : leaf / flower / bud / stem / shoot / fruit ------ (any 2) ---- 2 m

OR

Root system ---------------------------------------------------------------------- 1 m

List the organ : root / root hair ------------------------------------------------ 2 m

d) i) Nervous system / Integumentary system /

Circulatory system / Muscular system /

Endocrine system ----------------------------------------- (any 2) ---- 2 m

ii) Nervous system – detect the changes(increases or decreases) of

temperature.

Integumentary system – stop or increase sweating process.

Circulatory system – blood vessel(arteriole) will either constrict

(vasoconstriction) or dilate(vasodilation).

Muscular system – hair erector muscle will either contract to raise the

hairs or relax to lower the hairs.

Endocrine system – secrete more or less adrenaline / thyroxine hormone.

* any 2 correct explanation ------------- 2 m

2. a) X = phospholipid bilayer ------------------------------------------- 1 m

Y = carrier protein --------------------------------------------------- 1 m

Z = pore / channel protein ------------------------------------------ 1 m

b) i) 1. hydrophilic head ------------------------------------------------------------ 1 m

2. hydrophobic tail ------------------------------------------------------------ 1 m

ii) Characteristic : semi permeable / selectively permeable membrane ---- 1 m

Explanation : a membrane that allows only certain molecules /

substances / particles to pass through it -------------------- 1 m

iii) Main function :

Acts as a barrier between the internal & external environment of the cell //

Allows only specific molecules to pass through it //

Provide the structural basis for all cell membrane -------(any 1) --------- 1 m

c) i) Simple diffusion ----------------------------------------------------------------- 1 m

ii) Example :

· F1 : Gasses exchange at alveolus / body cells/tissues ---------------- 1 m

P1 - Oxygen that is in higher concentration at the alveolus

compare to in the blood capillary,

P2 - (so) Oxygen will diffuse from the alveolus to the blood

capillary.

P3 - Carbon dioxide that is more concentrated in the blood

capillary compare to in the alveolus

P4 - (so) Carbon dioxide will diffuse from the blood capillary to

the alveolus

F1 + any 2P --------------------------------------------------------------- 2 m

3 m

* similar explanation for at body cell/tissue

· F2 : Gasses exchange in unicellular organism ------------------------ 1 m

P1 - Oxygen is higher concentration in the water / surrounding

compare to in the Amoeba sp. / Paramecium sp. / unicellular

organism

P2 - (so) Oxygen will diffuse from the water into Amoeba sp. /

Paramecium sp. /the unicellular organism

P3 - Carbon dioxide is higher concentration in the Amoeba sp. /

Paramecium sp. / unicellular organism compare to in the

water / surrounding

P4 - (so) Carbon dioxide will diffuse from the Amoeba sp. /

Paramecium sp. / unicellular organism to the water /

surrounding

F2 + any 2P --------------------------------------------------------------- 2 m

3 m

PART C (ESSAY QUESTION)

1. i)

Amoeba sp.	Structure / Living processes	Paramecium sp.
Present	Pseudopodium	Absent
One	Number of contractile vacuole	Two
Absent	Cilia / Cillium	Present
One	Number of nucleus	Two / Micronucleus & macronucleus
With the help of pseudopodium	Movement / Locomotion	With the help of the cillium
Binary Fission or form spores when it’s in unfavourable condition	Reproduction	Binary Fission or conjugation when it’s in unfavourable condition

* any 4 correct differences ------------------------------ 4 marks

ii)

· Situation 1(S1) : Plant is not enough water ------------------------ 1mark

P1 – Transpiration is higher than water absorption -------------- 1 mark

P2 – More water molecules will diffuse out from stomata ------ 1 mark

3 marks

· Situation 2(S2) : Ecessive fertilizer given to the plant ----------- 1 mark

P1 – The soil becomes hypertonic // Root hair cell becomes hypotonic,

due to ecessive fertilizer. --------------------------------------- 1 mark

P2 – Water molecules will diffuse out from the root hair cells to the

soil ---------------------------------------------------------------- 1 mark

P3 – by / due to / via OSMOSIS ------------------------------------ 1 mark

* S2 + any 2P = 3 marks