Short Answer Type Questions
31. What happens when a test-tube full of water is:
(a) poured on cemented floor?
(b) poured on soil in a flower pot ?
34. State the important properties of soil.
35. How is loamy soil very useful for the crops?
32. Explain why, when some water is poured on soil, it gets absorbed but the same water flows down when poured on a cemented floor ?
33. Which of the two provides more air to plant roots : sandy soil or clayey soil? Why?
36. Can we make a pot with sandy soil ? Give reason for your answer.
Answers
Explanation:
31) [a] If water is poured on a cemented floor, the water remains in the floor and is not absorbed as cemented floor is not porous.
[b] If water is poured in a flower pot containing soil, water is absorbed in the soil, as it is porous (has tiny pores in it, from where the water seeps through).
34)
All soils contain mineral particles, organic matter, water and air. The combinations of these determine the soil's properties – its texture, structure, porosity, chemistry and colour. Soil is made up of different-sized particles. Sand particles tend to be the biggest.
35) Loam soils are best for plant growth because sand, silt, and clay together provide desirable characteristics. First, the different-sized particles leave spaces in the soil for air and water to flow and roots to penetrate. The roots feed on the minerals in the suspended water.
32)When some water is poured on soil it gets absorbed because it is porous, that’s mean having tiny pores in it. Whereas same water flows down on the cemented floor as because it is not porous.
(33) Ans:- Sandy soil provides more air to plant roots because clayey soil is not able to trap- enough air for the roots of plants.
36) Ans:- It is not possible to make pots with sandy soil because it is not sticky.