Question

Soil is the loose top layer of Earth's surface. Plants,depend on soil. It holds them up. It provides them with food and water. Soil is made of particles. These very small pieces mostly come from rocks broken down by weathering. Other soil particles come from rotting remains of plants and animals. The part of soil that comes from living things is called organic matter.
Many small organisms live in soil. They include worms, bacteria and Fungi. Fungi are like plants, but they aren't green. And they have no leaves, flowers or roots. The organisms feed on dead plants and animals.
They cause them to decay or break down. The decayed plant and animal matter is called humus. Humus makes the soil dark. It provides the nutrients, plants need to grow. Soil develops in layers. The top layer consists mostly of humus. It is called topsoil. The next layer down is called subsoil. Subsoil contains more rock particles then topsoil and less humus. It is not as good for growing plants. The layer below the subsoil has many pieces of rocks. The pieces get bigger when they are deeper in the ground. Most plants cannot grow in this rocky layer. The soil layers all rest on solid rock. It is called bedrock. There are many types of soil. Soil can be of many colours. They can also have different textures. Texture is the size of particles that make up soil. Clay is a type of soil with many small particles. The particles are packed together tightly. Clay can hold a lot of water which makes it heavy and sticky. Sand has much larger particles than clay. It feels rough. There is a lot of air space between the particles, so water drains through this soil easily. Loam contains a mix of sand and clay. Loam is the best soil for growing plants. It lets just the right amount of water pass through for plant roots to take in.
i) Name the material which provides nutrients for the formation of plant's body.
Humus c) Topsoil
Subsoil d) Rock bed
ii) Which organism does not help the dead plants and animals to decay?
Bacteria c)Fungi
Algae d) Worms
iii) Which is the most important factor that help in formation of the soil?
Lightning c) Sunlight
Wind currents d) Thundering
iv) Where do we find microorganism which help in the formation of humus?
Top soil c) Subsoil
Rocks d) Rock bed
v) Why can clay hold lots of water
Its particle size is very small.
Its particles have more soaking capacity.
Humus is present in the clay.
Lots of air space is present between the particles.
vi) Which soil allowed the higher amount of water to pass through for the plant roots?
Black soil c) Loamy soil
Sandy soil d) Clay
vii) Soil is divided into various types on the basis of……………….
colour c) drainage
texture d) aeration
viii) Soil is made up of_______
particles c) stones
bricks d) dead plants
ix) The part of the soil that comes from living organism is called _________
Organic matter c) Particles
Inorganic matter d) Decayed plants
x) Which topsoil is best suited for growing plants
sandy soil c) loamy soil
clay soil d) none of these

Answer 1

Answer:

I) humus

2) algae

3) lightening

4)topsoil

5)it's particles have more sailing capacity

6)sandy soil

7) texture

8) particles

9)organic matter

10)loamy soil

Explanation:

hope that your doubt is now cleared

Answer 2

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