English Medium कक्षा १० - CBSE Question Bank Solutions for Science

An object is kept at a distance of 1m from a lens of power +2D:

1. Identify the type of lens.
2. Calculate its focal length and distance of the image formed.

A student was asked to observe and identify the various parts of an embryo of a red kidney bean seed. He identified the parts and listed them as under:

I. Tegmen

II. Testa

III. Cotyledon

IV. Radicle

V. Plumule

The correctly identified parts among these are

(A) I, II and III

(B) II, III and IV

(C) III, IV and V

(D) I, III, IV and V

Name the parts A, B and C shown in the diagram and write their functions.

Name the parts labelled as A, B, C and D in the diagram given below:-

What is pollination?

How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.

In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially?

(i) Name the part marked 'A' in the diagram.

(ii) How dose 'A' reachese part 'B'?

(iii) State the importance of the part 'C'.

(iv) What happens to the part marked 'D' after fertilisation is over?

A student while observing an embryo of a pea seed in the laboratory listed various parts of the embryo as given below:

Testa, Tegmen, Radicle, Plumule, Micropyle, Cotyledon.

On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the above list:

(a) Testa, Radicle, Cotyleddon

(b) Tegmen, Radicle, Micropyle

(c) Cotyledon, Plumule, Testa

(d) Radicle, Cotyledon, Plumule

Name the parts A, B and C shown in the following diagram and state one function of each.

A student has to perform the experiment "To identify the different parts of an embryo of a dicot seed." Select from the following an appropriate group of seeds:

(a) Pea, gram, wheat

(b) Red kidney bean, maize, gram

(c) Maize, wheat, red kidney bean

(d) Red kidney bean, pea, gram

State significance of pollination.

Name and differentiate between the two modes of pollination in flowering plants.

A student identified the various parts of an embryo of a gram seed and listed them as given below :

(I) Testa

(II) Plumule

(III) Radicle

(IV) Cotyledon

(V) Tegmen

Out of these the actual parts of the embryo are :

(A) I, II, III

(B) II, III, IV

(C) III, IV, V

(D) II, IV, V

Name the parts labelled as A, B, C and D in the diagram given below:

"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.

Give one example of a unisexual flower.

Mention the changes a flower undergoes after fertilisation.

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 :

(A) III, I, V, IV, II

(B) III, I, II, IV, V

(C) III, IV, V, I, II

(D) III, I, IV, V, II