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2 Section A [60 marks] Answer a11 questions in this section Jnwuh semua socilan ckilam h~zhugiun ini
Iliagram 1.1 shows a cross section of a leaf. Rqjuh I. 1 ~~enunjukkirn keratun renfus selieicli dczu?7.
Ulagra11.1 1. I Rajah 1.1
(a)
Label thc structures P,Q.R and S Luhelk~rn slruk/ur P, R dun S Q,
[4 marks]
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Confidential 3 (b) Explain the stage of cell organization in the leaf Terangkan peringkut organisasi sel dirlorn iiuun.
(c) Explain the role of structure R . Terungkun peranun struktur R
( 2 marks]
(d) Table 1 shows some organelles in cells.
Juduul lmen~injlikknn heberapa orgunel di dalan~ sei
Lysosornes
. .
---
Smooth Endoplasrnic reticulum
Mitochondria Centr~oles Chloroplast Golgi apparatus Vacuoles
1 .
---
Table 1 Jadual 1
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By referring to Diagram 1.1 ,Tick ( c, ) the organelles that are not found
in the cells in the boxes provided in Table 1
Dcng~7r1 nlerujuk kepadr~ rajah 1 1, ranchkan beherapa orgunel yang ritlclk terrlupcrl di dalurn sel-sel. di dulum .Judual 1
[2 marks]
Diagram 1.2 Rajah 1.2
(e) Diagram 1.2 shows a part of the molecular structure of an organic compound
Sound in cells. Name the cell structure and an organelle that contain this organic compound.
Rrgnh 1.2 nietlrrnjzikkan sebuhugian stuktur rnolekul sesuutu sehatian or,pnjk yung tt'rdupul di dalum sel. Namuk~~n sesuntu struktur dalum scl dun sesuuiu organel dalam sel yang ~ ~ ' Y I g ~ r l d sebntiun organik ini. ~llgi
[2 marks]
TOTAL
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Paper 2 Marking scheme Section A
QUESTION I
-No .(a)
( Able to name the structures P,Q,R a1nd S
P- xylem I xylem vessels Q- phloem I sieve tube R- spongy mesophyll cell I mesophyll cell S- guard cell
Mnrkinn -..* ...- ...... criteria
Marks
(b)
Able to explain the stage of organization with reason Sample Answer The leaf is an organ Consists of epidermal tissues, ground t~ssues and vascular tissues1 Various tissues Combined together to perform photosynthesis1a specific functibn Able to explain the role of R Sample answer F : R is a spongy mesophyll cell Can absorb light for photosynthesis E: contains chlorophyll /chloroplasts Able to indicate the correct organelles 1 1
1 Any 2
( Centrioles
Chloroplast Golgi apparatus Vacuoles
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Able to name the cell structure and the organelle F : Sample Answer Cell structure : Chromosas;-ra Organelle: Nucleus
2
7
Total =I2
QUESTION 2
No (a)(i) (ii)
I
X : Respiration 1 aerobic respiration 1 cellular respiration
Mitochondria Able to explain how ATP are formed based on diagram. Sample answer Oxidation of glucose molecule during cellular respiration Energy released used to form bond between ADP and inorganic phosphates Reaction catalysed by ATP synthetase Able to state the uses of ATP molcules Sample answer : Root hair cells: Release energy for active transport of mineral salts from the soil into the cell sap. Neurones: @eleaseenergy for the synthesis of neurotransmitters Able to explain the difference in number of ATP molecules Sample ]answer: Aerobic !respiration: F: All available energy stored in glucose molecule are released E l : Glucose molecule is completely oxidized by oxygen E2: Carbon dioxide and water are produced as waste products Anaerobic respiration: F:.Much energy still trapped in the lactic acid molecule E l : Glucose molecule not completely broken down in absence of oxygen
Marking criteria
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