term 1 revision

Q. 1 ______________________ change forms a new susbtance.

• Physical

• Chemical

During photosynthesis. the plants produces oxygen and energy in the form of sugar in presence of sunlight and chlorophyll when carbondioxide reacts with water. Identify the reactants from the above statement

• Reactants- Oxygen and Energy in the form of sugar

• Reactants - carbon dioxide and water

• Reactants - sunlight and chlorophyll

From the given image identify the apex (final) consumers.

• Mouse, rabbit, bird

• Fox, Owl, Snake

• Fox, Owl, Hawk

• Snake, Frog, Grasshopper

From the given image identify the primary consumers.

• Mouse, rabbit, bird

• Grasshopper, Owl, Snake

• Fox, Owl, Rabbit

• Grasshopper, Mouse, Rabbit

Hema says shredding of paper is a chemical change. Is she correct? Why?

• No, because of change in colour

• Yes, because of change in size

• Yes, because a new substance is formed.

• No, because of change in size

Answer explanation

Shredding of paper is a physical change because no new substance is formed. When a paper is shredded the size and shape of the paper chnages. Its an irreversible physical change.

Boiling occurs at any temperature below the boiling point. True or False

• True

• False

Answer explanation

Evaporation occurs at any temperature below the boiling pointof a substance.

Anaya washed her shoes and kept it for during under the sun. Name the process that helpes the shoes to dry.

• Condensation

• Boiling

• Evaporation

Answer explanation

When the wet shoes are kept under the sun, the water particles will gain energy and move far apart causing the water to turn into water vapour.

Anaya washed her shoes and kept it for during under the sun. It was also a windy day. Comment about the rate of evaporation of water from the shoes kept under the sun on a windy day.

• rate of evaporation remains the same

• rate of evaporation increases

• rate of evaporation decreases

Answer explanation

Temperature, Humdity and Wind are the factors that affects teh rate of evaporation.

Riya says that in a soft drink the gas evolved is a result of chemical reaction. Is she correct?

• Yes

• No

Answer explanation

Because the gases in the soft drinks are crbondioxide which are compressed and added to liquid. It doesnt react with the liquid. When we open a soft drink can or bottle the gases are evolved out and the liquid remains inside the bottle

Using the following food chains given below, make a food web

plants, deer, snake, eagle

plants, mouse, snake, eagle

plants, mouse, eagle

grass, grasshopper, frog, eagle

grass, grasshopper, frog, owl