SPM Form 4 Chapter 8 Dynamic Ecosystem

Diagram shows a crab with barnacles on its shell.

What is the interaction between the crab and the barnacles?

Diagram shows a pond ecosystem.

Which of the organisms labelled A, B, C or D is at the highest trophic level?

• A

• B

• C

• D

R and S are two organisms which have benefits for each other in an interaction. Which of the following are R and S?

• R: Owl S: Rat

• R: Shark S: Remora fish

• R: Alga S: Fungus

• R: Pigeon Orchids S: Branches of tree

In the nitrogen cycle, nitrogen gas in atmosphere will be converted into nitrate by bacteria X.

What is bacteria X?

• Nitrogen-fixing bacteria

• Nitrifying bacteria

• Denitrifying bacteria

• Purifying bacteria

The following are information about Rhizobium sp. on legume plant.

• Rhizobium sp. live in roots nodule of legume plant.
• Rhizobium sp. obtains glucose from the legume plants

What is the role of Rhizobium sp. in roots nodule?

• Convert glucose to starch

• Convert nitrate into glucose

• Fix atmospheric nitrogen into ammonium compounds

• Fix nitrite into nitrate

Which of the following are abiotic components in an ecosytem?

I. Consumer

II. Decomposer

III. Humidity

IV. Light intensity

• I and II only

• III and IV only

• I and III only

• II and IV only

Diagram shows an interaction between snowshoe rabbit and Canada lynx. The interaction is

• Saprophytism

• Intraspecific competition

• Interspecific competition

• Prey-predator

Diagram shows the energy flow in a food chain. What is the amount of energy received by the secondary consumer if the energy produced by the plant is 50000 kJ?

• 5 kJ

• 50 kJ

• 500 kJ

• 5000 kJ

The following information is related to a process occur in an ecosystem.

• The pioneer species is replaced by a new species which is more adapted to the habitat.
• The process occurs gradually over a long period of time.
• The process end with a climax community.

What is the process?

• Colonisation

• Competition

• Succession

• Evolution

Diagram shows the root structure of a mangrove plant.

• Prop root

• Buttress root

• Pneumatophore

• Viviparous