Homework Practice

Printable assignment

Life, Reactions and Our Planet

Section A: Life Processes and Chemical Reactions

Question 1mcq

The process by which green plants make food is:

A.Digestion

B.Photosynthesis

C.Transpiration

D.Respiration

Question 2mcq

Which gas is released during photosynthesis?

A.Oxygen

B.Nitrogen

C.Hydrogen

D.Carbon monoxide

Question 3mcq

The human heart has:

A.Five chambers

B.Two chambers

C.Four chambers

D.Three chambers

Question 4mcq

A reaction in which heat is released is called:

A.Physical reaction only

B.Neutral reaction only

C.Exothermic reaction

D.Endothermic reaction

Question 5mcq

When an acid reacts with a base, the products are usually:

A.Salt and water

B.Only hydrogen

C.Sugar and starch

D.Only oxygen

Question 6mcq

The chemical formula of baking soda is:

A.NaHCO₃

B.NaCl

C.HCl

D.CaCO₃

Section B: Environment, Control and Coordination

Question 7mcq

The functional unit of the nervous system is the:

A.Nephron

B.Alveolus

C.Platelet

D.Neuron

Question 8mcq

A reflex action is usually:

A.Fast and automatic

B.Slow and planned only

C.A type of digestion

D.Always controlled by the stomach

Question 9mcq

Which of these is biodegradable?

A.Glass shard

B.Aluminium foil

C.Vegetable peel

D.Plastic bottle

Question 10mcq

Ozone layer is important because it:

A.Makes all rain salty

B.Creates earthquakes

C.Stops all winds

D.Protects Earth from harmful ultraviolet rays

Question 11mcq

A food chain always begins with:

A.Top carnivores

B.Producers

C.Decomposers only

D.Plastic waste

Question 12mcq

Why is excessive use of chemical fertilisers a concern?

A.It removes all pests forever

B.It turns soil into gold

C.It can harm soil and water quality

D.It always increases biodiversity