List of top Science Questions asked in CBSE X

Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
How is the equal genetic contribution of male and female parents ensured in the progeny?
Outline a project which aims to find the dominant coat colour in dogs.
A study found that children with light-coloured eyes are likely to have parents with light-coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive? Why or why not?
The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as
What could be the reasons for adopting contraceptive methods?

Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.

How does reproduction help in providing stability to populations of species?
A person needs a lens of power −5.5 diopters for correcting his distant vision. For correcting his near vision, he needs a lens of power +1.5 diopter. What is the focal length of the lens required for correcting?
(i) distant vision, and
(ii) near vision?
How are the modes for reproduction different in unicellular and multicellular organisms?
What are the different methods of contraception?
Why does menstruation occur?
What are the functions performed by the testes in human beings?
The change in focal length of an eye lens is caused by the action of the
What are the advantages of sexual reproduction over asexual reproduction?
The anther contains
The least distance of distinct vision for a young adult with normal vision is about
Which of the following is not a part of the female reproductive system in human beings?
The human eye forms the image of an object at its
Asexual reproduction takes place through budding in

What would be the consequences of a deficiency of haemoglobin in our bodies?

How are the alveoli designed to maximise the exchange of gases?

What is the role of the acid in our stomach?

The breakdown of pyruvate to give carbon dioxide, water and energy takes place in