ng question (any five )
1. What is irrigation? Name two methods of irrigation.
2. Why is nylon used for making bristles of toothbrushes?
3. What happens to air when it gets heated up?
4. What are the main function of the cell membrane?
5. Explain why an apple dropped from a height always falls down on the earth
6. Write a note on artificial plastic cell?
7. What is Goat paper Recycling Machine?
Answers
Answer:
1.The process of watering the crops is called irrigation. Two methods of irrigation are: (i) Sprinkler system : This system is used on the uneven land where less water is available. The perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals.
2.Nylon is used for making bristle of toothbrush because nylon is the synthetic fibre that is strong and flexible . It doesn't degrade , or break down , in water or with the types of ingredients usually found in toothpaste , which makes for a toothbrush with a longer usable life .
3.As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward
Answer:
1. the supply of water to land or crops to help grow by artificial method is called irrigation. two methods of irrigation are modern methods that include sprinkler irrigation and drip irrigation; traditional irrigation that includes manual irrigation where water is pulled out by the farmers themselves from the wells and canals to irrigate the land.
2. Nylon is used for making bristle of toothbrush because nylon is the synthetic fibre that is strong and flexible . It doesn't degrade , or break down , in water or with the types of ingredients usually found in toothpaste , which makes for a toothbrush with a longer usable life .
3. As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward
4. Function of cell Membranes. The cell membrane, which is also called the plasma membrane, has many functions, but the most basic one is to define the borders of the cell and keep the cell functional. The plasma membrane is selectively permeable.
5. AN APPLE DROPPED FROM A HEIGHT ALWAYS FALLS DOWN ON THE EARTH BECAUSE OF FORCE OF GRAVITY. THIS FORCE IS DUE TO ATTRACTION BETWEEN THE EARTH AND THE APPLE..
6. An artificial cell or minimal cell is an engineered particle that mimics one or many functions of a biological cell. ... Often, artificial cells are biological or polymeric membranes which enclose biologically active materials
7. Oriental has invented a machine – the White Goat Recycling Machine – that actually turns shredded office paper into toilet paper. All it takes is about 40 sheets of paper to make one roll of toilet paper.
Explanation:
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