Q4. (A) Answer the following questions in short. (Any four)
1. Explain the process of making yarn from fibre.
2. How is a slightly smaller metal rim fitted on a wooden wheel of a bulloc
3. Write three benefits of grouping materials.
4. A drawing sheet changes when you draw a picture on it. Can you reverse t
5. How does a honeybee produce honey?
(B) Explain giving scientific reasons. (Any three)
Pame
Answers
Answer:
1) The process of making yarn from fibres is called spinning. Fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form yarn.
2) The metal rim is made slightly smaller than the wooden wheel. On heating, the rim expands and fits onto the wheel. Cold water is then poured over the rim, which contracts and fits tightly onto the wheel.
3) We group materials for our convenience. Dividing materials into groups makes it convenient to study their properties and also observe any patterns in these properties. It makes our study systematic and helps us to locate them easily.
5) Most bees gather only pollen or nectar. ... When her nectar “sacs” are full, the honeybee returns to the hive. Nectar is delivered to one of the indoor bees and is then passed mouth-to-mouth from bee to bee until its moisture content is reduced from about 70% to 20%. This changes the nectar into honey.
Answer:
1 - The process of making yam from fibres is called spinning. Fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form yarn.
2 - The metal rim is made slightly smaller than the wooden wheel. On heating, the rim expands and fits onto the wheel. Cold water is then poured over the rim, which contracts and fits tightly onto the wheel
3 - Dividing materials into groups makes it convenient to study their properties and also observe any patterns in these properties. It makes our study systematic and helps us to locate them easily.
4- A drawing sheet changes when you draw a picture on it. Can you reverse this change? ... No, we cannot get the same drawing sheet back if we draw the picture on it with pen or paint. It can be reversed by rubbing the picture with eraser if drawn with a pencil.
5 - Most bees gather only pollen or nectar. ... When her nectar “sacs” are full, the honeybee returns to the hive. Nectar is delivered to one of the indoor bees and is then passed mouth-to-mouth from bee to bee until its moisture content is reduced from about 70% to 20%. This changes the nectar into honey.