Homework Practice

Printable assignment

Invisible Worlds: Cells, Microbes and Earth’s Resources

Section A: Cells and Microorganisms

Question 1mcq

The basic structural and functional unit of life is the:

A.Bone

B.Tissue only

C.Organ only

D.Cell

Question 2mcq

Which part controls most activities of a cell?

A.Nucleus

B.Chlorophyll

C.Vacuole

D.Cell wall

Question 3mcq

Which microorganism is used to make curd?

A.Lactobacillus

B.Mosquito

C.Earthworm

D.Mushroom only

Question 4mcq

Antibiotics are used mainly to fight:

A.Bacterial infections

B.Broken bones

C.Noise pollution

D.Lack of sunlight

Question 5mcq

Which disease can be spread by mosquitoes?

A.Rickets

B.Scurvy

C.Malaria

D.Night blindness

Question 6mcq

Why do plant cells usually have a cell wall?

A.It makes sound.

B.It gives support and shape.

C.It helps them walk.

D.It stores sunlight as air.

Section B: Conservation and Resources

Question 7mcq

Coal and petroleum are called fossil fuels because they are formed from:

A.Metal wires

B.Ancient dead organisms over millions of years

C.New leaves every day

D.Fresh rainwater

Question 8mcq

Which action helps conserve resources?

A.Burning extra fuel for fun

B.Throwing paper after one use

C.Switching off lights when not needed

D.Keeping taps open

Question 9mcq

Deforestation can lead to:

A.More forests immediately

B.Less carbon dioxide always

C.Cleaner rivers always

D.Loss of habitats and soil erosion

Question 10mcq

Which is a renewable resource?

A.Sunlight

B.Natural gas

C.Coal

D.Petroleum

Question 11mcq

Why should plastics be used carefully?

A.Plastic always purifies water.

B.All plastics become food.

C.Plastic grows on trees.

D.Many plastics do not decompose easily.

Question 12mcq

A wildlife sanctuary mainly helps to:

A.Increase hunting

B.Protect animals and their habitats

C.Build more factories

D.Remove all plants