Page 67 - APS(2022)_TG5 _Edisi Guru

Sains Tingkatan 5 Bab 2

3. Berdasarkan rajah kitar nitrogen di halaman 42, tuliskan proses dan mikroorganisma yang terlibat dalam kitar
nitrogen. TP 2
Based on the diagram of nitrogen cycle in page 42, write the processes and the microorganisms involved in the nitrogen cycle.

Proses Nama proses Tindak balas Mikroorganisma
Process Process name Reaction Microorganism

P Pengikatan nitrogen Nitrogen Nitrat Bakteria pengikat nitrogen 2
Nitrogen fixation Nitrogen Nitrate Nitrogen-fixing bacteria

Q Tumbuhan dan haiwan mati Sebatian BAB
Penguraian Bakteria pengurai
Decomposition ammonium Decomposing bacteria
Dead plants and animalas Ammonium compund
R Pendenitritan Nitrat Nitrogen Bakteria pendenitritan
Denitrification Nitrate Nitrogen Denitrifying bacteria

S Penitritan Nitrit Nitrat Bakteria penitritan
Nitrification Nitrite Nitrate Nitrifying bacteria

4. Tandakan (3) pada cara-cara nitrogen dalam atmosfera ditukarkan kepada nitrat di dalam tanah. TP 1
Tick (3) the ways nitrogen in the atmosphere can be converted to nitrate in the soil.
Tindakan kilat Tindakan bakteria pengurai
3 3
The action of lightning The action of decomposing bacteria
Tindakan bakteria pengikat nitrogen Larut-resap air hujan
3
The action of nitrogen-fixing bacteria Leaching of rainwater
5. Gariskan jawapan yang betul untuk melengkapkan pernyataan di bawah. TP 1
Underline the correct answer to complete the statement below.
Setelah tumbuhan dan haiwan mati, (pengurai, bakteria pengikat nitrogen) akan menguraikan tisu-tisu mati
organisma kepada sebatian (nitrat, ammonium). Bakteria (pengikat nitrogen, penitritan) mengubah sebatian
ammonium menjadi nitrit dan kemudian mengubah sebatian nitrit menjadi (nitrat, gas nitrogen).
When plants and animals die, (decomposers, nitrogen-fixing bacteria) will decompose the dead tissues into (nitrate, ammonium)
compounds. (Nitrogen-fixing, Nitrifying) bacteria convert ammonium compounds into nitrite and then convert nitrite compounds into
(nitrate, nitrogen gas).

6. Tandakan (3) pada tumbuhan legum yang membekalkan nitrat kepada tanah. TP 1
Tick (3) the leguminous plants which supply nitrate to the soil.
Kacang tanah Terung
3
Groundnuts Brinjal
Kacang panjang Kacang soya
3 3
Long beans Soy beans
7. Apakah kepentingan kitar nitrogen? TP 2
What are the importance of the nitrogen cycle?

siratan makanan alam semula jadi kesuburan keseimbangan rantai makanan
food web nature fertility balance food chain

(a) Membantu dalam mengekalkan kesuburan tanah.
Helps in preserving the fertility of soil.

(b) Memastikan kesinambungan rantai makanan dan siratan makanan .
Ensures the continuity of the food chain and food web .
keseimbangan alam semula jadi
(c) Mengekalkan unsur nitrogen dalam .
Maintains the balance of nitrogen in nature .

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02 BAB 2.indd 43 7/28/21 3:01 PM