Page 18 - PBD Plus Biologi T5 (EG)

Biologi Tingkatan 5 Bab 2

(b) Huraikan bagaimana suhu mempengaruhi kadar transpirasi. TP 2
Describe how temperature affects the rate of transpiration.
– Semakin meningkat suhu, tenaga kinetik antara molekul air bertambah
As temperature increases, the kinetic energy between the water molecules increases
– Kadar penyejatan air daripada permukaan daun juga meningkat

The rate of water evaporation from the leaf surface also increases
– Lebih banyak wap air meresap keluar melalui stoma
More water vapour diffuses out through stoma

(c) Rajah di bawah menunjukkan graf faktor keamatan cahaya melawan kadar transpirasi. Huraikan
mengenai graf tersebut. TP 3 KBAT Mengaplikasi
The diagram below shows a graph of light intensity against the rate of transpiration. Describe about the graph.
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Kadar transpirasi / Rate of transpiration

Keamatan cahaya / Light intensity
– Pada keamatan cahaya rendah, kadar transpirasi adalah terhad.
At low light intensity, the rate of transpiration is limited.

– Apabila keamatan cahaya meningkat, stoma akan terbuka, lebih banyak wap air tersejat keluar
daripada daun./ When the light intensity increases, the stomata open, more water evaporates out from the leaves.
– Kadar transpirasi meningkat. / Rate of transpiration increases.
– Sehingga menjadi malar pada suatu keamatan cahaya tertentu.

Until it becomes constant at certain light intensity.
– Disebabkan oleh faktor pengehad seperti kelembapan relatif udara, suhu dan pergerakan udara.

Due to the limiting factor such as the relative air humidity, temperature and air movement.

(d) Berdasarkan graf di bawah, terangkan mengenai faktor pergerakan udara terhadap kadar transpirasi.
Based on the graph below, explain about the air movement factor that affects the rate of transpiration. TP 3 KBAT Mengaplikasi

Kadar transpirasi Transpiration rate

Kelajuan angin
Wind velocity
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02 PBD PLUS BIOLOGY TG5.indd 28 25/11/2022 10:14 AM