Question 9:
Define the following terms:

(i) Non-Periodic change

(ii) Man-made change

(iii) Desirable change

(iv) Fast change

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Solution

(i) Non-periodic change: The changes which do not repeat themselves after a regular interval of time are known as non-periodic changes.

(ii) Man-made changes: Man-made changes are those changes that are created by humans and it does not occur naturally.

(iii) Desirable Changes: Those changes which are desired to occur, that is, we want them to take place are known as desirable changes.

(iv) Fast change: The changes which take place in a short period of time are called fast changes.

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Similar questions

Define the following with suitable examples.

(i) Natural and Manmade change

(ii) Periodic and Non periodic change

(iii) Temporary and Permanent change

Q. Distinguish between the following.
(a) Physical change and chemical change
(b) Periodic change and non-periodic change
(c) Natural change and man-made change

Question 4.

(i) What are periodic changes? Explain with examples.

(ii) Is a forest fire a periodic or a non-periodic change?

Question 4

Which of the following is/are true when milk changes into curd?

(i) Its state is changed from liquids to semi-solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.

Choose the correct option from below :
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i), (iii) and (iv)
(d) (i) to (iv)

Question 10
New species may be formed if

(i) DNA undergoes significant changes in germ cells.
(ii) Chromosome number changes in the gamete.
(iii) There is no change in the genetic material.
(iv) Mating does not take place.

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii), (iii) and (iv)
(d) (i), (ii) and (iii)

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Question 9: Define the following terms: (i) Non-Periodic change (ii) Man-made change (iii) Desirable change (iv) Fast change

Question 9:
Define the following terms:

(i) Non-Periodic change

(ii) Man-made change

(iii) Desirable change

(iv) Fast change