Page 103 - APS(2022)_TG5 _Edisi Guru

Sains Tingkatan 5 Bab 1

3
2. Piring Petri diisi dengan 5 cm agar nutrien steril dan 1 cm kultur bakteria.
3
3
3
A Petri dish was filled with 5 cm of sterile nutrient agar and 1 cm of bacterial culture.
BAB
3. Cakera antibiotik berkepekatan tinggi dan cakera antibiotik berkepekatan rendah diletakkan
di atas permukaan agar nutrien.
1
An antibiotic disc with a high concentration and another antibiotic disc were placed with a low concentration onto
the surface of the nutrient agar.

4. Piring Petri ditutup dengan penutup dan penutup itu dilekatkan menggunakan pita selofan.
The Petri dish was covered with a lid and the lid was sealed using cellophane tape.
5. Piring Petri diterbalikkan dan dibiarkan selama dua hari dalam suhu bilik.
The Petri dish was inverted and it was left aside for two days at room temperature.
EKSPERIMEN WAJIB
6. Rajah untuk menunjukkan keadaan agar nutrien dilukis pada akhir eksperimen.
A diagram to show the condition of the nutrient agar was drawn at the end of the experiment.

Pemerhatian
Observation Kepekatan antibiotik Keluasan kawasan jernih
Concentration of antibiotic Size of the clear area
K3 Kepekatan tinggi / High concentration Lebih luas / Larger
PI
1 Kepekatan rendah / Low concentration Kurang luas / Smaller
2
3 K3P1 K3P2 K3P3
S

Kawasan jernih
Clear area

Perbincangan 1. Berdasarkan pemerhatian, jenis cakera antibiotik yang manakah lebih berkesan untuk
Discussion mengawal pertumbuhan bakteria?
Based on the observations, which type of antibiotic disc is more effective in controlling the bacterial growth?
Cakera antibiotik berkepekatan tinggi / Antibiotic disc with a high concentration

2. Apakah inferens yang dapat anda buat berdasarkan pemerhatian di dalam piring Petri?
What inference can you make based on the observation in the Petri dish?
merencatkan
Antibiotik pertumbuhan bakteria.
Antibiotics inhibit the growth of bacteria.
3. Nyatakan definisi secara operasi bagi antibiotik.
State the operational definitiaon for antibiotic.

Antibiotik ialah bahan yang menghasilkan kawasan jernih di atas permukaan agar nutrien.
An antibiotic is a substance that produces a clear area on the surface of the nutrient agar.

4. Reema menghidapi selesema dan dia pergi berjumpa doktor. Tetapi, doktor tidak memberi
sebarang antibiotik kepadanya. Mengapa? TP 3
Reema had a cold and she went to see a doctor. But, the doctor did not give her any antibiotics. Why?

Antibiotik tidak dapat memusnahkan virus .
Antibiotics cannot destroy virus .

Kesimpulan 1. Hipotesis diterima . / Hypothesis is accepted . K4P2
Conclusion
2. Semakin tinggi kepekatan antibiotik, semakin luas kawasan jernih di atas permukaan
agar-agar nutrien.
The higher the concentration of an antibiotic, the larger the clear area on the surface of the nutrient agar.

© Penerbitan Pelangi Sdn. Bhd. 22

01 BAB 1.indd 22 7/28/21 2:56 PM