Question

1. Define Law of Inertia. 2

2. Draw and label meristematic tissues. Also write their function 3

3. Why does desert cooler cool better on a hot, dry day? 2

4. Why does the naphthalene balls kept in stored clothes in our home disappear over

a period of time? 2

5. A bus decreases its speed from 80km/hr to 60km/hr in 5s. Find the acceleration of

the vehicle. 2

6. Define Second Law of Motion and derive its expression mathematically. 3

7. Classify plastids on the basis of colour and function.​

Answer 1

Answer:

your answer is here

Explanation:

1. Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

3.On a hot dry day, the amount of water vapor present in air is less. Thus, water present inside the desert cooler evaporates more, thereby cooling the surroundings more. That is why a desert cooler cools better on a hot dry day.

4.Naphthalene balls undergo the process of sublimation. The naphthalene balls keep subliming slowly. Thus,after a certain period of time the naphthalene ball kept in stored clothes in our homes disappear over a period of time without leaving any residue

5. u=80km/h=22.2m/s

v=60km/h=16.7m/s

t=5s

a=v-u/t

a=16.7-22.2/5

=-5.5/5

=-1.1m/s^2

6.Newton's Second law of motion :- The rate of change of momentum is directly proportional to the force applied on the system.

7. The plastids contain the pigments which may be of various types. Sometimes pigments are absent. On the basis of presence of pigments, the plastids are of two types: (i) the chromoplasts (chromatography) having pigment, and (ii) the leucoplasts which are colorless plastids.