List of practice Questions

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?
Draw a labelled diagram of the longitudinal section of a flower.
What are the differences between the transport of materials in xylem and phloem?
Why does menstruation occur?

Describe double circulation of blood in human beings.Why is it necessary?

The change in focal length of an eye lens is caused by the action of the
What are the functions performed by the testes in human beings?
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
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
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

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 are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.

What are the necessary conditions for autotrophic nutrition and what are its byproducts?