Page 92 - APS(2022)_TG5 _Edisi Guru

Sains Tingkatan 5 Bab 1

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Kaedah 1. 5 cm bubur nutrien steril dan 1 cm kultur bakteria dimasukkan ke dalam tiga tabung uji
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Method 1
steril berlabel A, B dan C seperti yang ditunjukkan dalam rajah.
BAB
5 cm of sterile nutrient broth and 1 cm of bacterial culture were added into three sterile test tubes labelled A, B
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and C as shown in the diagram.
2. Mulut setiap tabung uji itu disumbat dengan kapas steril.
The opening of each test tube was stuffed with sterile cotton wool.
EKSPERIMEN WAJIB
3. Tabung uji A diletakkan di dalam almari yang bertutup.
Test tube A was placed inside a closed cupboard.

4. Tabung uji B diletakkan di atas meja di dalam makmal.
Test tube B was placed on a table in the laboratory.

5. Tabung uji C diletakkan di bawah cahaya terang lampu meja.
Test tube C was placed under the bright light of a table lamp.
6. Kekeruhan bubur nutrien diperhatikan selepas dua hari.
The cloudiness of the nutrient broth was observed after two days.

K1P5

Pemerhatian
Observation Tabung uji Keamatan cahaya Kekeruhan bubur nutrien
Test tube Light intensity Cloudiness of nutrient broth
K3
PI A Gelap / Dark Keruh / Cloudy
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2 B Malap / Dim Sedikit keruh / Slightly cloudy
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S C Terang / Bright Tidak keruh / Not cloudy

K3P1 K3P2 K3P3
Perbincangan 1. Berdasarkan pemerhatian, berikan satu inferens tentang pertumbuhan bakteria.
Discussion Based on the observation, give an inference about the growth of bacteria.

K4 Bakteria tumbuh dengan lebih baik dalam keadaan gelap .
PI Bacteria grow better in dark condition.
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2. Mikroorganisma kelas yang manakah tumbuh subur di dalam keadaan bercahaya? Mengapa?
3 Which class of microorganisms grow well in the light? Why?
S Menganalisis TP 2
Alga kerana perlu menjalankan fotosintesis .
Algae because they need to carry out photosynthesis .

3. Berdasarkan eksperimen ini, nyatakan definisi secara operasi bagi bakteria.
Based on this experiment, state the operational definition for bacteria.
Bakteria ialah mikroorganisma yang menyebabkan kekeruhan bubur nutrien dalam
keadaan yang gelap.
Bacteria are microorganisms which cause cloudiness of nutrient broth in dark condition.

Kesimpulan 1. Hipotesis diterima .
Conclusion
Hypothesis is accepted . K4P2
2. Bakteria tumbuh dan membiak dengan pesat dalam keadaan gelap .
Bacteria grow and reproduce rapidly in dark condition.

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