Page 93 - Hybrid PBD Sains TG3_Edisi Guru

Sains Tingkatan 3 Bab 3
2. Selain daripada transpirasi, tumbuhan juga kehilangan air melalui hujung urat daun seperti yang ditunjukkan
dalam gambar di bawah. SP 3.4.1
Apart from transpiration, plants also lose water through the tip of the vein as shown in the picture below.

(a) Namakan proses tersebut. TP1
Name the process.
Gutasi / Guttation

(b) Bezakan antara proses tersebut dengan transpirasi. TP3
Differentiate between the process with transpiration.

Gutasi membebaskan air dan garam mineral manakala transpirasi membebaskan air dalam bentuk wap air.
Guttation releases water and mineral salts while transpiration releases water in the form of water vapour.
3. Jalankan eksperimen di bawah bagi mengkaji faktor-faktor yang mempengaruhi kadar transpirasi. TP4
Carry out the experiments below to study the factors that affect the rate of transpiration. SP 3.4.2

Eksperimen
Eksperimen
Pernyataan masalah / Problem statement:
Apakah faktor-faktor yang mempengaruhi kadar transpirasi?
What are the factors that affect the rate of transpiration?
Hipotesis/ Hypothesis:
Keamatan cahaya, suhu, pergerakan udara dan kelembapan udara mempengaruhi kadar transpirasi
Light intensity, temperature, air movement and air humidity affect the rate of transpiration
Pemboleh ubah / Variables:
(a) Pemboleh ubah dimalarkan: Saiz dan jenis pokok
Constant variable: Size and type of plants
(b) Pemboleh ubah dimanipulasikan: Keamatan cahaya / suhu / pergerakan udara / kelembapan udara
Manipulated variable: Light intensity / temperature / air movement / air humidity
(c) Pemboleh ubah bergerak balas: Kadar transpirasi
Responding variable: Rate of transpiration
Bahan dan radas / Materials and apparatus:
Pokok keembung, air, minyak, kalsium klorida kontang, kapas, kelalang kon dan penimbang digital.
Balsam plant, water, oil, anhydrous calcium chloride, cotton wool, conical flask and electronic balance.
Prosedur / Procedure:
1. Sediakan susunan radas seperti yang ditunjukkan.
Set-up the apparatus as shown.
2. Timbang set radas itu seperti yang ditunjukkan di atas dan catatkan jisim Kapas Pokok
keembung
awal set radas itu di dalam jadual di bawah. Cotton Balsam plant
Weight the apparatus as shown in the diagram and record the initial mass of the apparatus in the Aras air Minyak
Oil
table below. Water Kelalang kon
level
3. Biarkan radas kawalan itu di dalam makmal sains selama tiga jam dan timbang Conical flask
Air
semula radas tersebut dan rekodkan jisim akhir. Water
Leave the apparatus which acts as control in the science laboratory for three hours and weight the apparatus again and record the final
mass.
4. Ulang langkah 1 hingga 3 dan jalankan eksperimen berikut.
Repeat step 1-3 and carry out the following experiments.
(a) Letakkan radas di tempat yang panas di luar makmal untuk mengkaji kesan suhu ke atas kadar
transpirasi.
Place the apparatus in a hot place outside the lab to study the effect of temperature on the rate of transpiration.
(b) Biarkan radas di dalam almari legap untuk mengkaji kesan keamatan cahaya ke atas kadar transpirasi.
Leave the apparatus in opaque cupboard to study the effect of light intensity on the rate of transpiration.

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