Structured Questions Soalan Struktur
1 Complete the following chart regarding the structure of a leaf.
Lengkapkan carta berikut mengenai struktur daun.
(a)
External structure Struktur luar
(b)
(c)
i
2
Label the cross-sectional diagram of a leaf as shown below.
Internal structure 1
Struktur dalaman
t I
I (e)
I
I'
Labelkan rajah keratan rentas daun yang ditunjukkan di bawah.
(a) (d)
(b) (g)
(c)
t
(g)
,.
(e)
(t)
Leaf Structure and Function
Struktur dan Fungsi Daun
ii STRUCTURE OF A LEAF
T STRUKTUR DAUN
Objective Questions Soa/an Objektif
1 Which of the following is not the internal structure of a leaf?
Antara berikut, yang manakah bukan struktur dalaman bagi daun?
A Petiole Petiol B Epidermis
Epidermis C Spongy mesophyll
Mesojil berspan D Vascular bundle Berkas vaskular
2 What is a herbarium?
Apakah itu herbarium?
A A collection of plants Suatu koleksi tumbuhan
B A collection of herbaceous plants Suatu koleksi tumbuhan herba
C A collection of dried specimens of plants Suatu koleksi spesimen tumbuhan kering D A collection of dried specimens of animals
Suatu koleksi spesimen haiwan kering
3 Which structure of the leaf has the most chloroplast?
Struktur dalam daun yang manakah mempunyai paling banyak kloroplas?
A Lamina Lamina
B Palisade mesophyll Mesojil palisad C Spongy mesophyll
Mesofil berspan D Vascular bundle Berkas vaskular
4 Diagram below shows a cross section of a leaf.
Rajah di bawah menunjukkan suatu keratan rentas daun.
Identify the structures labelled P and Q.
Kenai pasti struktur yang berlabel P dan
Q.
p Q
A Upper epidermis Vascular bundle Epidermis atas Berkas vaskular B Lower epidermis Vascular bundle Epidermis bawah Berkas vaskular C Mesophyll palisade Upper epidermis Mesojil palisad Epidermis atas D Upper epidermis Spongy mesophyll
Epidermis atas Mesojil berspan
13
l
Structured Questions Soalan Struktur
1 Diagram below shows a cross section of a leaf.
Rajah di bawah menunjukkan keratan rentas sehelai daun.
P:
Q:
R:
(a) Name the structures labelled above.
Namakan struktur-struktur yang berlabel di atas.
(b) State two tissues that form structure Q.
Nyatakan dua tisu yang membentuk struktur Q.
(c) Identify which structure is involved in the opening and closing of stomata.
Kenai pas ti struktur yang manakah terlibat dalam pembukaan dan penutupan stomata.
( d) Gaseous exchange occurs between the leaf and the surrounding air. Briefly explain how the structure you had mentioned in question l(c) is involved in the gaseous exhange of the plant.
Pertukaran gas berlaku antara daun dan udara sekitarnya. Terangkan secara ringkas bagaimana struktur yang anda sebutkan dalam soalan I (c) terlibat dalam pertukaran gas tumbuhan.
( e) Why is it necessary for the stomata to close at night?
Mengapakah penting bagi stomata menjadi tertutup pada waktu ma/am?
2 Fill in the blanks with the correct answer regarding the mechanism of stomata! opening and closing.
/sikan tempat kosong dengan jawapan betul mengenai mekanisme pembukaan dan penutupan stomata.
(a)
Opening of stomata Pembukaan stomata
• During the day, the _ _ _ cells carry out photosynthesis and produce many glucose.
Semasa hari siang, sel-sel _ _ _ menjalankan fotosintesis dan menghasilkan banyak glukasa.
• The concentration of sucrose in the guard cells Kepekatan sukrosa dalam sel-sel pengawal
• Intake of _ _ _ ions into the guard cells occurs very _ _ _
Pengambilan ion-ion _ _ _ ke dalam sel pengawal berlaku secara _ _ _
• The _ _ _ pressure in the guard cells
Tekanan _ _ _ dalam sel pengawal _ _ _ .
• Water from the surrounding _ _ _ cells diffuses through _ _ _ into the vacuole of guard cells.
Air daripada sel-sel _ _ _ di sekeliling meresap secara _ _ _ ke dalam vakuol sel pengawal.
• The vacuole of guard cell causes the _ _ _ to push into the cell wall.
Vakuol sel pengawal menyebabkan _ _ _ menolak ke dinding sel.
• The guard cell becomes _ _ _ and curves Se! pengawal menjadi _ _ _ dan melengkung
• The stoma will _ _ _ Stoma akan· _ _ _
Closing of stomata Penutupan stomata (b)
• During the night, the guard cells _ _ _ carry out photosynthesis.
Semasa hari siang, sel-sel pengawal _ _ _ menjalankan fotosintesis.
• The concentration of sucrose in the guard cells Kepekatan sukrosa dalam sel-sel pengawal
• Potassium ions move out of the _ _ _ cells into the epidermal cells.
/on-ion kalium keluar daripada sel-sel _ _ _ ke sel-sel epidermis.
• The osmotic pressure in the guard cells
Tekanan osmosis dalam sel pengawal _ _ _
• Water from the _ _ _ cells diffuses out through _ _ _ into the surrounding epidermal cells.
Air daripada sel-sel _ _ _ meresap keluar secara _ _ _ ke dalam sel-sel epidermis di sekeliling.
• The guard cell becomes _ _ _ and curves Se! pengawal menjadi _ _ _ dan melengkung
• The stoma will _ _ _ Stoma akan _ _ _
17
3 Read the following infonnation.
Baca maklumat berikut.
I _ .
Ditferent types of plant have different distribution of stomatatumbuhan yang berbeza mempunyai ta~ stomata yang berbeza
(a) What is the difference in tenn of distribution of stomata between monocotyledonous and eudicotyledonous leaves?
Apakah perbezaan dari segi aspek taburan stomata antara daun monokotiledon dan daun eudikotiledon?
(b) Explain how the distribution of stomata in aquatic plants allows them to carry out photosynthesis at an optimum rate.
Terangkan bagaimana taburan stomata dalam tumbuhan akuatik membenarkan tumbuhan untuk menjalankan fotosintesis pada kadar yang optimum.
(c) Explain why most stomata are found in the lower epidennis of the eudicotyledonous leaves.
Terangkan mengapa kebanyakan stomata ditemui pada epidermis bawah daun eudikot.
4 Answer the following questions.
18
Jawab soalan-soalan berikut.
Y - - - + - - 1
Cold day Harisejuk
(a) What is the function of the cell labeled Y?
Apakahfungsiselberlabe!Y?
Warm day Haripanas
(b) Explain how the changes to the guard cells on wann day help the plant to survive.
