Q8 of 55 Page 1

(a) Name any four varieties of vegetables which have been produced from ‘wild cabbage’ by the process of artificial selection.

(b) Give one example of an evolutionary change produced is an organism for one purpose which later on becomes more useful for a different function.

(a) The four varieties which have been produced from ‘wild cabbage’ by the process of artificial selection are as follows:


1. Cabbage


2. Broccoli


3. Kale


4. Kohlrabi


(b) The example of an evolutionary change which was produced in an organism for one purpose which later on becomes more useful for a different function is as follows:


The feathers in the birds were first for providing the insulation to the bodies of birds . So, that they can protect themselves during winter but these feathers lead an evolutionary change and it is now used for flight by the birds.


More from this chapter

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6

An element ‘X’ has atomic number 13:

(a) Write its electron configuration.


(b) state the group to which ‘X ‘belongs?


(c) Is ‘X’ a metal or a non- metal?


(d) Write the formula of its bromide.

 7

Explain the variation of the following properties of the element in the periodic table.

(i) Atomic radius in a period.


(ii) Metallic character in a period.


(iii) valency in a group.

 9

Subhash has started the project of constructing his building. His architect suggested that he should add a system of rain water harvesting in his building. He though by adopting water harvesting in his project he can solve his project he can solve his water crisis problem in the year to come.

(i) Is Subhash correct in his approach? Support your answer.


(ii) Give the value show by subhash.

 10

A student cannot see the chart hanging on a wall placed at a distance of 3 m from him. Name the defect on vision he is suffering from. How can it be corrected? Draw ray diagrams for the

(i) defect of vision and also


(ii) for its corrections.