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The layer of atmosphere in which the ozone layer is present is:

Which of the following statement is correct about sexual reproduction?

Which of the following is mismatched?

An organ which is the most important articulator of speech is __________ .

(a) E is the gene for brown eye colour and e is the gene for blue eye colour. Which gene is (i) recessive, and (ii) dominant?

(b) Both father and mother have the genes Ee in their cells. What colour are their eyes?

(c) Which combination of genes in the zygote will produce children with blue eyes?

(d) Which combination of genes in the zygote will produce children with brown eyes?

Given below are hypothetical figures in regard to population (in crores) of two countries A and B during the last three decades.

$$\begin{array}{cccc}Country& 1971& 1981& 1991\\ A& 6.4& 9.6& 10.6\\ B& 15.7& 15.7& 15.3\end{array}$$

The country _(i)_ shows negative population growth between years _(ii)_ and _(iii)_.

Which of the following is not a major reason for sharp rise in world human population in the recent past?

Menstrual cycle is the shedding of _________.

Why does menstruation occur? [3 MARKS]

Stem cuttings are commonly used for vegetative propagation in _______.

Mendel’s typical dihybrid cross is

Which of the following is true about the digestive systems of the animals mentioned below?

The basic significance of a hormone is _____.

Which sterilization method is used for permanent birth control in men?

Which of the following is not a criteria for autogamy to occur?

What will happen if anybody human being go inside water?If he or she will normal or anything happens to him or her?

Lactational amenorrhea is a kind of temporary postnatal infertility that occurs when a woman is not menstruating and fully breastfeeding upto a maximum of

How does sexual reproduction result in variation of characters in the offspring

Identify the figures showing the process of budding in yeast

Which of the following fluids are part of the vascular system in our body?

Given below is the diagram of an apparatus used to study a particular phenomenon in plants :

(a) Name the apparatus.

(b) What is it used for ?

(c) What is the role played by the air-bubble in this experiment ?

(d) What is the use of the reservoir ?

(e) What happens to the movement of the air-bubble if the apparatus is kept :

(i) in the dark; (ii) in sunlight; (iii) in front of a fan ?

Give a reason in each case.

Name the basic structural and functional unit of living beings.
[1 MARK]

What happens to blood when it is pumped into the thin-walled blood vessels of the lungs?

Carbon dioxide is replaced with oxygen

Platelets are exchanged for plasma.

Blood fills the lungs and causes coughing

Nothing, the lungs are just a place blood goes through on its way back to the heart

Which of the following cells are known as soldiers of the body?

The air passing through the nostrils in humans is filtered by:

Ash from burning volcanoes, dust from storms and forest fires are the natural sources of ___ pollution.

Match the items in Column I with those in Column II and write down the matching pairs.

Darwin toured to the ______ which helped him arrive at his theory of "Natural selection".

The changes within the uterine wall continue, in order to receive and implant the

What are the advantages of sexual reproduction over asexual reproduction? [2 MARKS]

Name the following :

(a) Hormone that stimulates growth by cell-division.

(b) Growth retarding hormone in plants.

(c) Main auxin found in most plants.

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

Dominant character is represented by a capital letter and recessive by small letter. Which of the following alleleic pairs are possible in F1 generation ?

From the picture, identify the endocrine glands and the hormones secreted by them in a male.

The process of focusing the eye to see the objects at different distances is termed as

Give examples for the following: [3 MARKS]

a) Fibre obtained from the fruit of a plant.

b) Fibre obtained from the stem of a plant.

c) Fibre obtained from chemicals (artificially).

C.T. Scanner uses___to get three-dimensional visuals of internal organs.

Assertion: Blood group 'O' have Anti-A and Anti-B antibodies.
Reason: It does not have any antigens.

Choose the correct option.

Match the following:-

When your finger gets accidentally caught at the door, the pain message is sent to your brain through:

Repeated selfings produces: