English Medium Class 10 - CBSE Important Questions for Science

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

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

Write the names of those parts of a flower which serve the same function as the following do in the animals :

(i) testis,

(ii) sperm,

(iii) ovary,

(iv) egg

State the function of flowers in the flowering plants.

How is the process of pollination different from fertilization?

Name the male part of the flower.

Give one example each of unisexual and bisexual flowers. Differentiate between the two types of pollination that occur in flowers. What happens when a pollen lands on a suitable stigma? Write about the events that occur till the seed formation in the ovary.

You have to perform the experiment, "To identify the different parts of an embryo of a gram seed." Describe the procedure that you would follow.

The students of a class were asked by the teacher to study the different parts of an embryo of an angiosperm. Given below are the essential steps for the experiment :

A. Soak the seeds in plain water and keep them overnight.

B. Cut open the soaked seed and observe its different parts.

C. Take some healthy seeds in a petri-dish.

D. Drain the excess water, cover the seeds with a wet cotton cloth and leave them as it is for a day.

The correct sequence of these steps is

(a) C, A, D, B

(b) C, D, A, B

(c) A, C, D, B

(d) A, C, B, D

Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.

Identify A, B, C and D in the given diagram and write their names.

A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(A) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV

“Cell division is a type of reproduction in unicellular organism.” Justify.

Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:

(a) Female germ cell

(b) Male germ cell

(c) Ovary

Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.

Write the names of male and female reproductive parts of a flower.

Answer the following question.
List two agents of pollination?

Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.

State the number of sets of chromosomes present in a zygote.

Sexual maturation of reproductive tissues and organs are necessary link for reproduction. Elucidate.