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A person sleeping under a tree during night feels lethargic when he wakes up in the morning. What could be the possible reason?

Sound proof rooms are often made to avoid loud noise. The material generally used for sound proofing of rooms is

Which of the following glands has a role in activation of sperms?

Traits found in males are due to the presence of __ chromosome.

During an active menstrual cycle, what is the indication that no fertilisation of the ovum has taken place?

The average pumping rate of heart in a healthy adult under rest is___ beats per minute.

Select the correct explanation for the labels A, B, C and D.

The ribs move down and inwards during:

Which among them is not an evidence that indicates evolution from a common ancestor?

Identify the master gland that regulates the functions of other endocrine glands.

Q15. India’s population growth during the 20^th century can be classified into four distinct phases. Match List-I (period) with List-II (Phase) and select the correct answer using the codes given below the list:

List I (Period) List II (Phase)

A. 1901-1921 1. Steady growth

B. 1921-1951 2. Rapid high growth

C. 1951-1981 3. Stagnant growth

D. 1981-2001 4. High growth with definite sings of slowdown

Mothers carrying their babies home through the jungle after the day's work in the fields hushed their singing lest they might curtail the restful sleep of the venerable herd-robber.

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The advantage that internal fertilisation has over external fertilisation is that in internal fertilisation :
(a) new off-springs are exactly like the parent
(b) production of large numbers of gametes is unnecessary
(c) copulation and fusion of gametes is passive
(d) fewer individuals are produced

The hormone(s) that control(s) the menstrual cycle in human beings is

How many pairs of chromosomes are present in human beings? Out of these how many are sex chromosomes? How many types of sex chromosomes are found in human beings?

"The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it". Draw a flow chart showing determination of sex of a newborn to justify this statement.

Can you give an example of eugenics ?

When we ingest our food it goes the oesophagus in the form of bolus . But due to some uneasiness if we force out the food by vomiting (by ourselves not automatically) the food comes out as we ate it .. how is it possible that after the for changes into bolus how can it come out as we ate it???

Divide
yourselves into groups of four or five and brainstorm on any one of
the given situations in order to create an imaginary dialogue or a
comic strip. Keep in mind the characters and situations while doing
so. Representatives from each group could then present the dialogues
/ read them to the class.

Difference between Pepsin and renine.

Which hormone :

(a) prepares the body for action?

(b) controls the amount of glucose in the blood?

(c) gives boys a deep voice?

(d) gives girls soft skin?

Which of the following are called 'carriers' of heredity?

Answer the following questions

What is the fundamental duty of each citizen regarding environment?

Which of the following is greenhouse gas?

Question 36 (b)

Fill in the blanks

(b) Cell wall of fungi is made up of ____.

Assertion: Chloroplasts contain chlorophyll which trap solar energy.

Reason: Plastids with green pigmentation help in storage of starch.

1st know ancestors of modern horse were known as______

Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, A = {1, 2, 3, 4}

The set A^I is

The enzymes that helps in fermentation of sugar to ethanol is:

Opiate narcotic drugs are:

The junction formed by two neurons is called ______ and they communiacte by releasing a chemical called ______.