Page 51 - PWR UP TG3 SAINS

Sains Tingkatan 3 Bab 2
3. (a) Perhatikan struktur stoma di bawah.
Observe the structure of stoma below.

Stoma
Stoma
Sel pengawal
Guard cell

Labelkan / Label the:
(i) Stoma
Stoma
(ii) Sel pengawal
Guard cell
(b) Lakukan aktiviti di bawah. SP 2.5.1 TP6
Carry out the following activity.

AKTIVITI PAK-21 Pembentangan Hasil Sendiri

(i) Lakukan kerja dalam kumpulan.
Work in groups.
(ii) Dapatkan maklumat dari internet tentang
Get information from the internet about
• Resapan air ke dalam sel pengawal melalui proses osmosis dan kesannya.
Di usion of water into the guard cell through osmosis process and its e ects.

• Resapan air keluar dari sel pengawal melalui proses osmosis dan kesannya.

Di usion of water out of the guard cell through osmosis and its e ects.
• Resapan karbon dioksida yang berlaku dalam stoma mengikut perbezaan kepekatan.

Di usion of carbon dioxide that occurs in the stoma is due to the di erence in concentration.

(iii) Persembahkan maklumat yang diperoleh di hadapan kelas dalam bentuk persembahan multimedia.
Present your nding in front of the class in the form of multimedia presentation.

Jawapan pelajar / Student's answer

4. Rajah di bawah menunjukkan tiga helai daun yang di atasnya terdapat enapan debu dan jelaga. Keadaan ini
berterusan selama beberapa bulan dan menyebabkan tumbuhan tersebut mati.
Terangkan keadaan ini. SP 2.5.1 TP5 KBAT Menilai
The diagram below shows three leaves on which there is dust and soot deposition. This condition continued for several months and causes
the plant to die. Explain this condition.

Debu dan jelaga yang terdapat pada permukaan daun akan menghalang cahaya matahari daripada diserap
oleh klorofil. Maka, kadar fotosintesis akan berkurangan.

Dusts and soot on the surface of the leaves will prevent sunlight from being absorbed by chlorophyll. Thus, the rate of photosynthesis will
decrease.

Kriteria Kejayaan: .............................................................................................
Saya berjaya:
• Merumuskan mekanisme pertukaran gas dalam tumbuhan.

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