11.

A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

• Towards the normal while entering the prism and away from the normal while emerging from the prism.

• Away from the normal while entering the prism and towards the normal while emerging from the prism.

• Away from the normal while entering as well emerging from the prism.

• Away from the normal while entering as well emerging from the prism.

 A student was asked by his teacher to find the image distance for various object distances in case of a given convex lens. He performed the experiment with all precautions and noted down his observations in the following table:

 After checking the observation table the teacher pointed out that there is a mistake in recording the image distance in one of the observations. Find the serial number of observations having faulty image distance.

• 2

• 3

• 5

• 5

A student has obtained a magnified image of a flame on a screen using a convex lens. To draw the corresponding ray diagram to show the image formation, which of the following two rays whose paths after refraction are shown, should he select?

• I and II

• II and III

• III and IV 

• III and IV 

Study the following diagrams showing various stages of binary fission in Amoeba:

The correct sequence of these diagrams should be:

• I, IV, III,II, V

• I, III, IV, II, V

• I, II, IV, III, V

• I, II, IV, III, V

Identify the figures showing the process of budding in yeast.

• I, II AND III

• II, III AND IV

• I, II AND IV

• I, II AND IV

Which one of the following pairs of vegetables is an example of homologous structures?

• Potato and sweet potato

• Carrot and radish

• Carrot and tomato

• Carrot and tomato

Four students P, Q, R and S differently reported the following set of organs to be analogous:

P. Forelimb of a frog and forelimb of a lizard

Q. Forelimb of a bird and forelimb of a human

R. Wings of a parrot and wings of a butterfly

S. Wings of a bird and wings of a bat

The two students who have reported correctly are:

• P and Q

• Q and R

• R and S

• R and S

You are asked by your teacher to study the different parts of an embryo of a gram seed. Given below are the steps to be followed for the experiment:

I. Soak the gram seeds in plain water and keep them overnight.

II. Cut open a soaked seed and observe its different parts

III. Take some dry gram seeds in a petri dish

IV. Drain the excess water

V. Cover the soaked seeds with a wet cotton cloth and leave them for a day.
The correct sequence of these steps is:

• III, 1, V, IV, II

• III, I, II, IV, V

• III, IV, V, I, II

• III, IV, V, I, II

Write the number of vertical columns in the modern periodic table. What are these columns called?

Give the respective scientific terms used for studying:

(i) The mechanism by which variations are created and inherited and

(ii) The development of new type of organisms from the existing ones.