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Sains Tingkatan 5 Bab 1
Kaedah 1. Susunan radas disediakan seperti yang ditunjukkan pada rajah.
Method
The apparatus was set up as shown in the diagram.
BAB
3
3
2. 5 cm bubur nutrien steril dan 1 cm kultur bakteria dituangkan ke dalam tabung uji A, B dan C.
3
5 cm of sterile nutrient broth and 1 cm of the bacterial culture were poured into Petri dishes A, B and C.
3
1
3. Beberapa titis asid hidroklorik cair, natrium hidroksida cair dan air suling masing-masing
ditambahkan ke dalam tabung uji A, B dan C.
A few drops of dilute hydrochloric acid, dilute sodium hydroxide and distilled water were added into test tubes A,
B and C.
4. Mulut setiap tabung uji ditutup dengan kapas steril.
The opening of each test tube was stuffed with sterile cotton wool.
EKSPERIMEN WAJIB
5. Semua tabung uji dibiarkan selama dua hari. / All the test tubes were left for two days.
6. Pemerhatian dicatatkan selepas dua hari. / Observations were recorded after two days.
Pemerhatian
Observation Tabung uji Keadaan bubur nutrien Kekeruhan bubur nutrien
Test tube Condition of the nutrient broth Cloudiness of the nutrient broth
K3
PI A Berasid / Acidic Sedikit keruh / Slightly cloudy
1 Beralkali / Alkaline
2 B Sedikit keruh / Slightly cloudy
3 C Neutral / Neutral Sangat keruh / Very cloudy
S
K3P1 K3P2 K3P3
Perbincangan 1. Berdasarkan pemerhatian, berikan satu inferens tentang pertumbuhan bakteria di dalam
Discussion
keadaan berasid dan beralkali.
Based on the observation, give an inference on the growth of bacteria in acidic and alkaline conditions.
K4
PI Keadaan berasid dan beralkali tidak sesuai untuk pertumbuhan bakteria.
1 Acidic and alkaline conditions are not suitable for the growth of bacteria. K4P1
2
3
2. Berdasarkan eksperimen ini, nyatakan definisi secara operasi bagi pertumbuhan bakteria.
S Based on this experiment, state the operational definition for bacterial growth.
proses
Pertumbuhan bakteria ialah yang menyebabkan bubur nutrien menjadi
sangat keruh dalam keadaan neutral / pH 7
.
Bacterical growth is a process that causes the nutrient broth to become
very cloudy in neutral condition / pH 7 .
3. Nyatakan satu aplikasi kesan pH terhadap pertumbuhan mikroorganisma dalam kehidupan
harian. TP 3
State one application of the effect of pH on the growth of microorganisms in daily life.
Larutan iodin ialah asid lemah yang digunakan sebagai antiseptik yang disapu pada
permukaan kulit yang luka untuk menghalang pertumbuhan bakteria.
Iodine solution is a weak acid used as an antiseptic which is applied to the surface of an injured skin to prevent the
growth of bacteria.
Kesimpulan 1. Hipotesis diterima . / Hypothesis is accepted . K4P2
Conclusion
2. Bakteria tumbuh subur dalam keadaan neutral tetapi tidak dalam keadaan
berasid atau beralkali .
Bacteria grow well in neutral condition but not in acidic or alkaline
conditions. K4P3
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01 BAB 1.indd 16 7/28/21 2:56 PM
