Q.4 Answer the following questions in very short.
1. Give an example of natural change.
2. Are physical changes irreversible?
3. Define stimulus.
4. Which method is used to cover the wooden wheels of bullock cart with iron rims?
5. Define cell.
6. Name the living thing that are called autotrophs.
Answers
Answer:
1.earthquake
2.no, they are reversible
3.A change in the environment to which A organism reacts is called stimulus.
4.painting
5. particles that make up our body
6. plants
Answer:
1. Birds get up early in the morning without fail .
2. A physical change may be reversible or irreversible.
3.stimulus is a detectable change in the physical or chemical structure of an organism's internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity.
4.Heating.
5.Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. ... Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell.
6.Green plants.