Question

Q.7-
Long answer type question-
1. How is water useful to plants?
2. What is an electromagnet?
3
3. What is the function of a speedometer?
4 What are periodic events? Give three examples?
Write a short note on sundials?
6 What is vegetative propagation?
7. Describe how some plants reproduce through roots, stems, or leaves.
5.​

Answer 1

1.Water is used for transpiration carrier of nutrients from the soil to green plant tissues. Water forms over 90% of the plant body by green or fresh weight basis. Plants can synthesis food through photosynthesis only in the presence of water in their system. Water helps to maintain the turgidity of cell walls.

2. An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.

3. Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.

4. Periodic event - an event that recurs at intervals. recurrent event. happening, natural event, occurrence, occurrent - an event that happens. migration - the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding.

e.g.- Revolution of earth, Rotation of earth, Oscillation of simple pendulum.

5. A sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the dial) and a gnomon, which casts a shadow onto the dial.

6. Vegetative reproduction (also known as vegetative propagation, vegetative multiplication or cloning) is any form of asexual reproduction occurring in plants in which a new plant grows from a fragment of the parent plant or a specialized reproductive structure.

7. In natural asexual reproduction, roots can give rise to new plants, or plants can propagate using budding or cutting. In grafting, part of a plant is attached to the root system of another plant; the two unite to form a new plant containing the roots of one and the stem and leaf structure of the other.