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Reproduction is linked to the stability of the population of a species. Justify with the statement.

What exactly are wasted during cross pollination?

Why abscisic acid is also known as stress hormone?Explain.

Which of the following has been causing most damage to the Taj Mahal?

___ was the most prominent difference between a Homo erectus and a Cro-magnon man.

The functions of human nervous system include:

The free ends of valves are attached to the wall of ventricles by means of :

Question 56

Draw a well labelled diagram of an eukaryotic nucleus. How is it different from a nucleoid?

Fill in the following blanks with suitable words :

(a) The two examples of effectors are .......... and .................

(b) Our ......................system allows us to react to our surrounding, Information from receptors passes along ............... neurons to our brain. Our brain sends impulses along ........... neurons to our muscles.

(c) A neuron which carries an impulse to the brain is called a .......... neuron.

(d) The neuron which carries a message for action to a muscle or gland is known as a ..................... neuron.

Reproduction is important as it allows:

Choose the correct function of the mixed nerve.

Question 9

In which part of the alimentary canal is food is finally digested?



(a) Stomach

(b) Mouth cavity

(c) Large intestine

(d) Small intestine

When the vegetation of a region reaches climatic climax, it usually becomes

Choose the
most appropriate answer.

(a) Internal
fertilization occurs

(i) in female body.

(ii) outside female body.

(iii) in male body.

(iv) outside male body.

(b) A
tadpole develops into an adult frog by the process of

(i) fertilization

(ii) metamorphosis

(iii) embedding

(iv) budding

(c) The
number of nuclei present in a zygote is

(i) none

(ii) one

(iii) two

(iv) four

Inflammation of joints due to accumulation of uric acid crystals causes______

On touching leaves of mimosa pudica, it droops down- Explain

Question 19

During adolescence, the body of boys and girls undergo certain changes. Given below are a few of those changes.

Categorize these changes into those that occur in boys and those that occur in girls and fill in the table given below.

The rate of breathing in aquatic organisms is much greater than that in terrestrial ones. Why?

Reproduction is essential for living organisms in order to :
(a) keep the individual organ alive
(b) fulfil their energy requirements
(c) maintain growth
(d) continue the species forever

Identify the phylum X

Do all cells use oxygen to produce energy?

What questions would you ask a nephrologist to maintain healthy kidneys?

Answer in Brief:

What is the three ‘R mantra’? Write its significance.

When a broken piece of the stem of a plant X is planted in the soil, a new plant grows from it in a week's time. The leaves of plant X also have many small entities Y in their margins which can fall to the ground alone or along with leaves and grow into new plants.
(a) Name a plant which X could be.
(b) What are the entities Y present on the leaves of X known as?
(c) Name a plant other than X which can be reproduced from its leaves.
(d) Name a common plant grown in many homes which can be propagated from its broken stems like plant X.
(e) Name a kind of dormant organs present in dry stems of old grass plants lying in the fields which get activated and produce green grass plants after the rains.

A student after observing a slide showing different stages of binary fission in Amoeba draws the following diagrams. However these diagrams are not in proper sequence:

The correct sequence is

(i) is observed as the National Pollution Prevention Day in India to mark the anniversary of the (ii) . Here, (i) and (ii) are

Choose the alternative which expresses the meaning of the idiom/phrase.

To oil one’s tongue:

Name the two waste products of the human body which are produced in the body cells.

Name the substance in the retina of a tiger which allows it to see better than human beings in the dark.

Give reasons.

Raisins soaked in water swell up after some time.

Fruits developing from an unfertilised ovary are

Write the differences between :
Open and Closed system of circulation

Law of segregation

The range of cranial capacities in the following ancestral forms were

(a) Australopithecus ___

(b) Homo habilis ___

(c) Homo erectus ___

(d) Cro-magnon ___

(e) Homo sapiens sapiens ___

If the length of E.coli DNA is 1,360 micron and the distance between two base pairs is 0.34 nm. Then what will be the total number of base pairs in this DNA?

Among lion, tiger and a domestic cat, all the three have the same number of 38 chromosomes, yet they have different appearances. How do you account for such differences?