grade 5 , con 3 , leeeon 1 &2

If the amount of grasses increases in an ecosystem, this directly increases the number of

• caracals.

• hawks.

• rabbits.

• lions.

When the number of the amount of grasses in an ecosystem increases

• producers decreases

• primary consumers increases

• secondary consumers increases

Overfishing and throwing plastic garbage in the sea affect the survival of directly.

• desert organisms

• marine organisms

• rainforest organisms

• redents

All the following are human activities that affect a marine ecosystem, except

• flooding.

• throwing human wastes.

• overfishing.

• throwing plastic garbage.

All the following are top predators, except

• hawks.

• tigers.

• butterflyfish.

The marine food web usually started with

• clam.

• zooplankton.

• dalgae.

• parrotfish

Decomposers play an important role in returning the energy back to all the following, except

• the air.

• the soil.

• the water.

• the decomposer.

The secondary consumer is considered as

• a prey for primary and tertiary consumers.

• a predator for primary and tertiary consumers.

• a prey for primary consumer.

• a prey for tertiary consumer.

In a food chain, the energy transfer

• from a predator to a prey.

• from a prey to a predator.

• from a predator to a producer.

• from a consumer to a producer.

The amount of energy that transfers between living organisms in a food web, is

• 10%

• 90%

• 30%

• 100%