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What is the purpose of establishing several Biosphere Reserves, Wildlife Sanctuaries and National Parks in India ?

The formation of a zygote requires:

Which of the following changes are observed during puberty?

I. Increase in height.

II. Development of hair in armpits and groin area.

III. Pain in joints and knees.

IV. Discoloration of nail fingers.

V. Development of reproductive organs.

(a) What is cytoplasm? What is its function?
(b) What is protoplasm? Name the four elements which make up the major part of protoplasm.

Identify the cells that contain plastids.

Choose the female sex hormones from the list.

Write a short note on weeding.

Which of the following factors endanger the existence of endemic species?



i. Destruction of habitat

ii. Increasing population

iii. Introduction of new species

To which class does the domestic cat belong?

Which of the following are prokaryotes?

Which substance can be used to kill microorganisms on the kitchen floor?

Define foetus.

The five kingdoms according to R.H. Whittaker's classification system are-

Which of the following organelle have these features?

(i) Large, spherical structure.
(ii) Present in almost all eukaryotic cell.
(iii) In animal cell it present at the centre of the cell.
(iv) In plant cells, it is present at the periphery.

Who discovered the nucleus?

How WBC 's are manufactured in our body?

The time in life when a boy or girl becomes sexually mature is known as ___ .

The virus which causes cowpox is it the same virus which causes small pox in humans

A snail moves with the help of:

For girls puberty begins at the age of ____________.

Which cycle is represented in the above figure?

Explain binary fission of amoeba with the help of a diagram.
[5 MARKS]

Consider the following statements:

A. In the Tundra region, animals have thick fur and thick skin.

B. Most of the animals in grasslands are herbivores.

C. In tropical rain forests, many animals live on trees.

Which of the following best explains these statements?

1. Scientists used to think vagal tone was largely stable, like your height in adulthood.
A.To appreciate why this matters, here’s a quick anatomy lesson.
B.Subtle variations in your heart rate reveal the strength of this brain-heart connection, and as such, heart-rate variability provides an index of your vagal tone.
C.Your brain is tied to your heart by your vagus nerve.
D.Our data show that this part of you is plastic, too, and altered by your social habits.
6. By and large, the higher your vagal tone the better.

Which among the following has both endocrine and exocrine character?

A virus always consists of double strand of DNA or RNA surrounded by protein coat. Actually answered is given false but viruses have Double strength. So the statement is true or false.

When stopping potential is applied in an experiment on photoelectric effect, no photocurrent is observed. This means that

Which act is aimed at preservation and conservation of natural forests?

In which kingdom, would you classify the archaea and nitrogen fixing organisms, if the five kingdom system of classification is used?

The depth to which adequate light for photosynthesis can penetrate into water is known as?

Name one disease which spreads through insect bites.

Question 6

Which among the following defines osmosis the best?



(a) Movement of water molecules from a region of higher concentration to a region of lower solute concentration through a semipermeable membrane

(b) Movement of solvent molecules from its higher concentration to a lower concentration

(c) Movement of solvent molecules from a higher concentration to a lower concentration of solution through a permeable membrane

(d) Movement of solute molecules from a lower concentration to a higher concentration of a solution through a semipermeable membrane