unit 2

1. what do the arrows in the food web represent ？

2. when the population of organism in an ecosystem is in balance, we consider the ecosystem to be

• the ecosystem is in succession

• The ecosystem is equilibrium

• The ecosystem is not balanced

• the ecosystem is endangered

how do the cactus survive in desert?

• thick waxy skin holds in water

• cactus never store water

• cactus have a thick skin

Which of these is most likely to help two populations of animals that interact with one another?

• Predation

• Competition

• Parasitism

• Mutualism

which of the following is decomposer?

• grass

• eagle

• mouse

• mushroom

how does sealion adapted in sea water?

• have smooth, streamlined bodies that have them to move easily through water.

• they can breathe in the water

• they do not have the flippers

Which of these is most likely to help two populations of animals that interact with one another?

• Predation

• Competition

• Parasitism

• Mutualism

During photosynthesis oxygen in a glucose comes from

• water

• carbon dioxide

• both water and carbon dioxide

• from air

‘Biodiversity’ is described as:

• The range of different species in an environment

• The seasonal and daily changes in an environment

• The way species differ from one another

• The influence of physical factors on an environment

All the energy in a food chain originate from

• A plant

• Farmers

• The Sun

• An electric generator