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Question 48

What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg??

If global warming continued, which of the following organisms would face relatively more severe threat?

In the $F_2$ generation of a cross, progeny having different traits are produced in the ratio 3 : 1. State whether it is a monohybrid cross or a dihybrid cross ? Give one example of such a cross.

Which of these following is/are mechanism(s) in which antibodies work on pathogens?

The number of mitotic cell divisions required to produce 256 cells from a single cell would be

Select the correct statement regarding the hypothalamic hormones.

Explain the function of Iris, Pupil and Retina. Differentiate near point and far point in human eye. [5 MARKS]

Why is the rate of photosynthesis minimum in green light and maximum in blue light??

Name the respiratory organs of the following organisms.

a) Fishes

b) Mosquitoes

c) Earthworms

In foetus , ductusarteriosus connects the

Give the reason, why a matured mammalian erythrocyte lacks nucleus and mitochondria?

Enumerate the common defects of vision, their causes and the possible methods of correcting them.

The outer side of the epidermis is covered by __

A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits- blood group A or O - is dominant? Why or why not?

How can malaria be treated or cured?

The presence of dengue virus can be confirmed by testing ___ count.

(a) Name the structural and functional unit of the nervous system.

(b) Draw a flowchart to show the classification of the nervous system into various parts.

(c) What is an autonomic nervous system? What is its function?

(d) What is a voluntary nervous system? Explain the working of the voluntary nervous system with an example.

Will fertilisation take place of pollen grains from one flower lands on the stigma of another flower of other species?explain(10 marks)

Petioles of leaves are weakened leading to falling of leaves due to

The ability of diaphragm in breathing can be attributed to its …………………..

Evolution can take place without variation.

The veins from head, neck and arms drain into ___

Assertion: Female ovaries have thousands of immature egg cells after birth.

Reason: Eggs are released from ovaries throughout one’s life.

Insulin protein consists of

What is meant by human circulatory system? What is meant by the term"single circulation" and "double circulation "

What do we actually mean by variation????? Is it only related to genes????

State the differences between artery, vein and capillary.

Which part acts as the gatekeeper of electrical conduction system of heart?

What do you understand by a Forest Reserve? Name the three demarcated zones that are used for this purpose.
[3 MARKS]

Explain how the direction of exchange of gases in plants changes with the time of day?

Answer
the following questions briefly.

(a)
How did the creatures of Bingle bog react to the nightingale's
singing?

(b)
Which are the different ways in which the frog asserts his
importance?

(c)
Why is the frog's joy both sweet and bitter?

(d)
Why was the frog angry?

(e)
How did the frog become the unrivalled king of the bog again?

Explain the following terms:
(a) Endothelium

(b) Lymph nodes

(c) Venule

(d) Diastole

Pick out the effects of various types of pollution on climate and on the environment.