Question

Q.4. Answer in detail.

1. Describe periodic motion with an example.

2. Mention some devices used to measure length.

3. Briefly describe the various types of habitats.

4. Define limbs , explain the parts which are termed as limbs.

5. How plants are classified on the basis of their life cycle ? Give examples.​

Answer 1

1. Periodic motion, in physics, motion repeated in equal intervals of time. ... Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.
2. Instruments like vernier calliper, metric rulers, scales and measuring tapes are commonly used to measure length.
3. The area where a particular organism lives naturally is called its habitat. The five major habitats are – forests, grasslands, deserts, mountains and polar regions, and aquatic habitat. Oceans and freshwater together form the aquatic habitat.
4. one of the projecting paired appendages (such as wings) of an animal body used especially for movement and grasping but sometimes modified into sensory or sexual organs. b : a leg or arm of a human being combat soldiers who had lost limbs. 2 : a large primary branch of a tree.
5. Plants are classified by the number of growing seasons required to complete their life cycle. Generally, these groups are annuals, biennials, and perennials. ... Plants are classified by the number of growing seasons required to complete their life cycle. Generally, these groups are annuals, biennials, and perennials.

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