Primary 4 Pre-Vocational Studies Flashcards: Soil Classification and Enrichment

Question 1

What is soil?

Accepted Answer

the loose top layer of the Earth where plants grow

Question 2

Plant roots hold firmly in the ground because soil provides ____.

Accepted Answer

anchorage

Question 3

Besides anchorage, soil supplies plants with water and ____.

Accepted Answer

nutrients

Question 4

Earthworms and many insects use soil as their ____.

Accepted Answer

home

Question 5

Clay soil can be used to make bricks and ____.

Accepted Answer

pots

Question 6

The three main soil types are sandy, clay and ____ soil.

Accepted Answer

loamy

Question 7

Soil with large, coarse particles that feels gritty is ____ soil.

Accepted Answer

sandy

Question 8

Water passes quickly through sandy soil because it has ____ drainage.

Accepted Answer

rapid

Question 9

Soil that feels smooth and sticky when wet is ____ soil.

Accepted Answer

clay

Question 10

Clay soil easily becomes waterlogged because it holds ____ water.

Accepted Answer

a lot of

Question 11

The soil best suited to most crops because it holds nutrients but drains well is ____.

Accepted Answer

loamy soil

Question 12

Soil infertility means that soil lacks enough ____ for healthy plant growth.

Accepted Answer

nutrients

Question 13

The removal of fertile topsoil by wind or water is soil ____.

Accepted Answer

erosion

Question 14

When too many animals feed on vegetation until the land is bare, it is called ____.

Accepted Answer

overgrazing

Question 15

Bush burning reduces soil fertility by destroying organic matter and useful ____.

Accepted Answer

microorganisms

Question 16

The washing of nutrients below the reach of plant roots is called ____.

Accepted Answer

leaching

Question 17

Decayed plant remains, food scraps and animal waste form ____.

Accepted Answer

compost

Question 18

Covering soil around plants with dry leaves or straw is called ____.

Accepted Answer

mulching

Question 19

A leguminous cover crop improves soil mainly by adding ____.

Accepted Answer

nitrogen

Question 20

Growing different crops on the same land in a planned sequence is crop ____.

Accepted Answer

rotation

Strong work.