Page 35 - PWR UP TG2 SAINS

Sains Tingkatan 2 Bab 2

12. Rajah di bawah menunjukkan satu rantai makanan di sebuah ladang yang melibatkan tiga populasi organisma.
Graf berikut menggambarkan saiz populasi bagi setiap organisma tersebut. SP 2.3.3 KBAT Menganalisis
The diagram shows a food chain in a plantation that involves three populations of organisms. The following graph represents the population
size of each of these organisms.

Tanaman Belalang Burung pipit
Crops Grasshoppers Sparrows

Saiz populasi Tanaman
organisma Crops
Population size
of organisms

Belalang
Grasshoppers

Burung pipit
Sparrows

Januari Februari Mac
January February March

(a) Pada bulan Mac, satu populasi ular telah berpindah ke ladang tersebut. Bagaimanakah perpindahan
populasi ular mempengaruhi perubahan saiz populasi belalang dan burung pipit? Terangkan mengapa.
In March, a snake population has migrated to this plantation. How has this affected the population size of the grasshoppers and
sparrows? Explain why. TP3
Saiz populasi burung pipit berkurang manakala saiz populasi belalang meningkat. Ular memakan

burung pipit dan menyebabkan bilangan burung pipit berkurang. Bilangan belalang bertambah kerana
bilangan burung pipit yang memakan belalang telah berkurang.

The population size of the sparrows decreases whereas the population size of the grasshoppers increases. The snakes feed on the
sparrows causing their number to decrease. The grasshoppers increase in number because there are less sparrows feeding on them.

(b) Pada graf di atas, ramalkan perubahan saiz populasi tanaman selepas bulan Mac dengan melengkap
graf. Terangkan ramalan yang dibuat. TP4
On the graph, predict the change in the population size of the crops after March by completing the graph. Explain the prediction made.

Penjelasan: Apabila bilangan belalang semakin bertambah, bilangan tanaman yang dimakan belalang
juga semakin bertambah. Oleh itu, saiz populasi tanaman berkurang.

Explanation: When the number of the grasshoppers increases, the number of crops eaten by the grasshoppers will also increase.
Hence, the population size of the crops decreases.

(c) Cadangkan satu organisma yang sesuai yang boleh diperkenalkan ke ladang tersebut untuk mengatasi
masalah yang dihadapi di (a). Berikan sebab organisma tersebut dipilih. TP5
Suggest one organism that can be introduced into the plantation to overcome the problem faced in (a). Give a reason for choosing this
organism.
Burung hantu. Burung hantu ialah pemangsa kepada ular.

Owls. Owls are predators of snakes.

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02 Bab 2.indd 23 9/24/20 4:09 PM