Page 94 - Hybrid PBD Sains TG3_Edisi Guru

Sains Tingkatan 3 Bab 3
(c) Letakkan radas di bawah kipas yang berputar laju untuk mengkaji kesan pergerakan udara ke atas
kadar transpirasi.
Place the apparatus in the laboratory under a fast-moving fan to study the effect of air movement on the rate of transpiration.
(d) Bungkus bahagian daun pokok keembung dengan beg plastik yang berisi kalsium klorida kontang
untuk mengkaji kesan kelembapan udara ke atas kadar transpirasi.
Wrap the leaves of the balsam plant with a plastic bag containing anhydrous calcium chloride to study the effect of air humidity
on the rate of transpiration.
5. Rekodkan keputusan dan hitung kadar transpirasi dengan menggunakan rumus di bawah.
Record the result and calculate the rate of transpiration by using the formula given below.
Kadar transpirasi / The rate of transpiration:
Perbezaan jisim / Difference in mass (g)
Masa / Time (min)
Pemerhatian / Observation:
Keadaan Jisim awal Jisim akhir Kadar transpirasi
Condition Initial mass (g) Final mass (g) The rate of transpiration (g/min)
Kawalan
Control
Tempat gelap
Dark place
Tempat panas Jawapan murid / Student’s answer
Hot place
Udara bergerak
Moving air
Tempat kering
Dry place

Perbincangan / Discussion:
1. Apakah tujuan meletakkan satu lapisan minyak di atas permukaan air?
What is the purpose of putting a layer of oil on the surface of the water?
Mengelakkan penyejatan air. / To prevent the evaporation of water.

2. Terangkan hubung kait antara / State the relationship between
(a) keamatan cahaya dengan kadar transpirasi
light intensity and the rate of transpiration
Semakin tinggi keamatan cahaya, semakin tinggi kadar transpirasi.
The higher the light intensity, the higher the rate of transpiration.
(b) suhu dengan kadar transpirasi / temperature and the rate of transpiration
Semakin tinggi suhu, semakin tinggi kadar transpirasi.
The higher the temperature, the higher the rate of transpiration.
(c) pergerakan udara dengan kadar transpirasi
air movement and the rate of transpiration
Semakin laju pergerakan udara, semakin tinggi kadar transpirasi.
The faster the air movement, the higher the rate of transpiration.
(d) kelembapan udara dengan kadar transpirasi
air humidity and the rate of transpiration
Semakin tinggi kelembapan udara, semakin rendah kadar transpirasi.
The higher the air humidity, the lower the rate of transpiration.

3. Apakah kesimpulan yang boleh dibuat berdasarkan eksperimen?
What conclusion can be done based on the experiment?
Faktor-faktor yang mempengaruhi kadar transpirasi ialah keamatan cahaya, suhu persekitaran, pergerakan

udara dan kelembapan udara.
The factors that affect the rate of transpiration are the intensity of light, temperature of the surroundings, air movement and air
humidity.

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