grade 5 , con 3 ,lesson 1

The Sun provides the Earth with:

• a light only

• light and warm

• warm only

• light and sound.

On extreme hot climate, the water of a lake

• increases due to evaporation.

• changes into ice

• decreases due to evaporation.

• has a lower temperature.

All the following factors pollute the water, except

• sunlight

• human wastes

• animals wastes.

• plastic garbage.

All the following are affected by water pollution, except

• the soil

• the Sun

• the animals.

• the plants.

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

• rabbits.

• lions.

• decomposers decreases

• caracals

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

• desert organisms

• marine organisms

• rainforest organisms

• redents

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

• producers decreases

• primary consumers increases

• secondary consumers increases

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

• flooding

• throwing human wastes.

• overfishing.

• throwing plastic garbage.

When there is a gentle rain in a desert ecosystem, this ecosystem may be

• harmed.

• improved.

• destroyed.

All the following are top predators, except

• hawks.

• tigers.

• butterflyfish.

• lions.