Sources of food 3NT

What is the name of the process where plant uses carbon dioxide, water and sunlight to make food?

• Respiration

• Decomposition

• Photosynthesis

• Digestion

What is needed to make food?

• Water, sunlight, chlorophyll, carbon dioxide

• Water, sunlight, chlorophyll, oxygen

• sunlight, chlorophyll, carbon dioxide

• Water, chlorophyll, oxygen

What is produce by green plants in the process of photosynthesis?

• Sugar, carbon dioxide

• oxygen, carbon dioxide

• water, sugar

• carbon dioxide, water

Excess sugar produced by plants became ________ and is stored in plants.

• starch

• protein

• vitamins

• mineral salts

Litmus paper can be used to test for acids. _________ litmus will turn _______ in acids.

• blue, red

• red.blue

• blue, pink

• pink, red

Litmus paper can be used to test for alkaline. _________ litmus will turn _______ in alkaline.

• red, blue

• blue, red

• pink, blue

• blue, pink

Acids has ph ______.

• less than 7

• equal 7

• more than 7

• more than 14.

Why are fertilizer added to soil? (More than 1 answer)

• For crops to grow bigger and faster.

• To protect crops from pest.

• Improve plant growth and crop yield.

• So that crops do not decompose.

What happens when too much fertilizer is added to the soil? (More than 1 answer)

• Contamination of the main source of drinking water

• pollute water and poison aquatic plants and animals

• Causes algae boom in lakes and river

• Fishes grow bigger after eating the fertilizer.

What is "Slash and burn" method used in agriculture?

• Cutting down the crops and setting the land on fire.

• Cutting down the crops and let the crops rot on the field.

• Burning away all the crops

• Use machines to clear all the crops.