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The current species extinction rates are estimated to be 100 to 1000 times faster than in pre-human times. This could be termed as the

Hazardous bio-medical wastes are usually disposed off by _________.

A thickened underground stem X of a plant which is swollen with stored food has a number of points Y on its surface. When the old stem X is planted in the soil of a field in the next growing season, then each point Y present on its surface grows into a new plant.
(a) What is the general name of the underground stems like X?
(b) Give one example of X.
(c) What are the points Y present on X was known as?
(d) Is it necessary to plant the whole of stem X in the ground to obtain its new plants? Explain your answer.
(e) What is the name of this method of reproduction of plants?
(f) What is the advantage of growing new plants from the underground stems like X?

Describe the role of thyroid gland in human body.

Which of the following is the third word from the right of step IV?

Variations in offspring are mainly introduced as a result of:

In the above cross, what is the allelic composition of the female gamete?

Which of the following is not a constituent of urine?

A fire in a building B is reported on a telephone to two fire stations P and Q, 20km apart from each other on a straight road. P observes that the fire is at an angle of 60 degree to the road and Q observes that the fire is at an angle of 45 degree to the road. Which station has to send it's team and how much will this team have to travel?

Refer to the diagram of the nephron given below and answer the questions.

(a) Where does ultrafiltration occur?

(b) Which structure contains urine?

Which of these is NOT TRUE about mitosis in humans:

A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:

(a) Which figure shows the correct position taken by the parts A and B of the plant?

(b) What type of phenomenon is exhibited by the figure chosen in (A) above?

Lymph is also called as __.

Rate of heart beat is under the control of

Movement of the chromatids towards the opposite poles of the cell is called:

Match the substages of prophase I of first meiotic division listed in column I with the important events pertaining to respective stages given under column II.

$\begin{array}{cccc}& ColumnISubstagesofprophaseI& & ColumnIIImportantevents\\ A& \text{Zygotene}& p& \text{Chromomeres}\\ B& \text{Pachytene}& q& \text{Bivalents migrate to periphery}\\ C& \text{Diplotene}& r& \text{Terminalization of chiasmata begins}\\ D& \text{Diakinesis}& s& \text{Crossing over}\\ & & t& \text{Synapsis}\end{array}$

Select the correct meaning of the given phrases/idioms.
Pull someone’s leg

From the figure, identify stolon.

Respiration and photosynthesis are just the

Name a waste gas excreted by plants only during the day time and the gas they excrete only during the night time.

Look at a cartoonist's presentation of a kind of pollution given below.

(i) Name the kind of pollution.

(ii) List the sources of pollution.

(iii) Mention any two harmful effects of this pollution.

______ are often lauded as the toughest creatures on planet Earth.

Question 3

The anther contains



(a) Sepals

(b) Ovules

(c) Carpel

(d) Pollen grains

Deficiency of which of the following hormones causes goitre?

A good
role model is very important for a growing up child. Discuss the kind
of learning that supports it.

Why is sense of smell important to our sense of flavour

Stress kicks the endocrine system into high gear. Justify.

In a mitotic cycle, the correct sequence of phases is

Label the parts of the female reproductive system in the picture below.​

Reflex actions like vomiting is controlled by

What is lymph?

write a detailed note on large intestine.

“Combined” contraceptive pill contains

Situations

The
first time the Nightingale sings.