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Leaves of the sensitive plant wilt and droop sown on a slight touch. What mechanism brings about this change?

Which of the following is not a natural disaster?

Question 40

If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.

Which among the following pictures are biodegradable substances?

When a moist slice of bread was kept aside for a few days then some organism grew on it to form a white cottony mass which later turned black. When this slice of bread was observed through a magnifying glass, then fine thread-like projections and thin stems having bulb-like structures at the top were seen.
(a) What are the common name and scientific name of the organism which grew on the moist slice of bread
(b) How did this organism grow on the moist slice of bread automatically?
(c ) What are the fine, thread-like projections on the surface of a slice of bread known as?
(d) What name is given to the knob-like structures and what do they contain?
(e) What is the name of this method of reproduction?
(f) Name one unicellular organism which reproduces by this method?
(g) Name two non-flowering plants which reproduce by this method.

Which part of the human brain controls the urge for eating and drinking?

The teacher instructed a student to place a healthy potted shoe flower plant in a dark room for 24 hours prior to an experiment on photosynthesis. The purpose of placing it in a dark room is

Which of the following fact about the cells in our body is false?

The __x__ transports urine from the kidney to the urinary bladder and the _y__transports urine from the urinary bladder to outside.

1. Why respiration is called pulmonary system ?

Which is the correct sequence of the components of a reflex arc?

While conducting experiments to study the effect of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X, however, bends away from stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following questions :

(a) What could stimulus A be?

(b) Name the stimulus B.

(c) What could stimulus C be?

(d) The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also, name these two stimuli.

A male human is heterozygous for autosomal genes A and B, and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh?

Question 41

Give reasons why acquired characters are not inherited.

Name the woody stem through which respiratory exchange of gases takes place .

Bat and butterfly wings cannot be help in evolutionary study, because ………………………

Ovulation is the

Saliva in the mouth converts ________ into _________ .

Question 5

Characters transmitted from parents to offspring are present in



(a) cytoplasm

(b) ribosome

(c) golgi bodies

(d) genes

What is Turner syndrome

Question 10:

ABA acts as antagonistic to
(a) ethylene
(b) cytokinin
(c) gibberellic acid
(d) IAA

The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :

(a) chemotropism

(b) nastic movement

(c) thigmotropism

(d) geotropism

Turgor pressure in plants results when

What is the importance of blind spot in our eyes

Given below is a statement or question followed by four choices. Select the correct answer to the given statement:

The cerebral hemispheres in mammals are connected by:

Which of the following is not a part of the inner ear?

Given below is the schematic diagram of the sectional view of the human male reproductive system.

(a) Name the parts numbered 1-11.

(b) State the functions of the parts numbered 1, 2, 3, 5, 8 and 11.

The boy is not ______ - he is ______ - and therefore, should not be tried in court as an adult.

Question 1
What are the factors could lead to the rise of a new species?

In living organisms, expression of traits are controlled by ________.

Answer the following questions:

1. Explain the following terms:

(a) Hydrotropic movement

(b) Chemical control in animals

2. Differentiate between:

Voluntary and Involuntary movements

3. Write a short note on:

(a) Reflex action

(b) Co-ordination in plants

What happens to the unused carbohydrates produced in the plant body?