Explanation

Encircle the correct answer: (5 marks)

1: The cat belongs to which group?

A: amphibian
B: birds
C: reptiles
D: mammals

2: _________________ causes polio.

A: protozoa
B: fungi
C: virus
D: bacteria

3: Which disease is caused by Air pollution?
A: diarrhea
B: lung cancer
C: typhoid
D: cholera

4: ____ is not a greenhouse gas.
A: Oxygen
B: methane
C: carbon dioxide
D: ozone

5: Speed of sound maximum in
A: metal wire
B: water
C: vacuum
D: air

6: The outer layer of Earth is called?
A: external core
B: crust
C: mantle
D: inner core

7: The change of milk into yogurt is?
A: physical change
B: chemical change
C: climate change
D: change of color

8: How many poles are there on a ring-shaped magnet?
A: 1
B: 3
C: 2
D: 4

9: What is important in the natural manure
A: mineral
B: sand
C: decayed matter
D: salts

10: The First artificial satellite was sent into space in?
A: 1945
B: 1969
C: 1957
D: 1973

Write the short answer to the following? ( 5 marks)

1: Define electric current.

Electric Current is the rate of flow of electrons in a conductor. The SI Unit of electric current is the Ampere.

2: Write two causes of friction.

Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations.

3: Name any two diseases caused by the virus.

Viral infections are any illness you get from a virus (a small germ that uses your cells to reproduce).

Common viral illnesses include colds, the flu, COVID-19, norovirus (“stomach flu”), 

4: Define micro-organism.

Microorganisms are minute organisms that are invisible to the naked eye.” Microorganisms are so small that they can only be seen under a microscope. 

These include a huge range of organisms such as bacteria, viruses, fungi, algae, protozoa, etc.

5: Differentiate between flowering and non-flowering plants.

Flowering plant:

A flowering plant reproduces with seeds which are protected by a flower or fruit.

Non-flowering plant:

Non-flowering plants include conifers, ferns, and mosses.

Label the following diagram flower