Read the following statements carefully and answer the correct one from codes given below:
I. Growth is a unidimensional, permanent and reversible change.
II. Growth is a unidimensional, permanent and irreversible change.
III. Growth is a poly-dimensional, permanent and irreversible change.
IV. Growth increases the dry weight of growing parts.

I and II are correct.

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II and III are correct.

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III and IV are correct.

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All of the above.

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Solution

The correct option is C III and IV are correct.
Growth is a fundamental characteristic of all living organisms. It is defined as an irreversible and permanent change in size, volume and weight of an organ or its parts or even of an individual cell. Growth is poly-dimensional as it results not only in increase of length or size, but also surface area and volume too. Growth increases the dry weight of growing parts. The increase in fresh weight of fruits, vegetables and storage organs is used as indicator of growth. However, the actual growth is found out by increase in dry weight.
So, only III and IV are correct.

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Q. Growth is a permanent and irreversible process. All living things grow from a single cell into an adult organism made up of billions of cells.

Question 13
In our country, there are attempts to increase the height of several existing dams like Tehri and Almati, dams across Narmada. Choose the correct statements among the following that are a consequence of raising the height of dams
(i) Terrestrial flora and fauna of the area are destroyed completely
(ii) Dislocation of people and domestic animals living in the area
(iii) Valuable agricultural land may be permanently lost
(iv) It will generate permanent employment for people

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

Q. Changing of water to ice is a physical change because
i. a new substance is formed
ii. ice is another form of water
iii. the change is reversible
iv. heat is taken away from water

(a) i, iii, iv are correct
(b) i, ii, iv are correct
(c) ii, iii, iv are correct
(d) i, ii, iii are correct

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)

Q. Which of the following statements is/are correct/incorrect?
I. A-bands of the muscle is dark and contain myosin.
II. I-bands are the light bands and contain actin.
III. During muscle contraction, the A-band contracts
IV. The part between the two Z-lines is called a sarcomere.
V. The central part of thin filament, not overlapped by thick filament is called H-zone.
Select the correct answer using the codes given below:

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