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P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the message to CNS through nerves Q. On the other hand, R is part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.

(a) What is P ? Name give organs which contain cells (or group of cells ) like P.

(b) Name the nerves Q.

(c) What is R ? Give two examples of R.

(d) Name nerves S.

(e) How do messages travel through the nerves Q and S ?

Question 49
What are the adaptations of leaf for photosynthesis?

Which of the following is not a component of blood?

Which of the following plant hormones is commonly used to produce seedless fruits?

Match the correct options in reference to Salivary glands :

During acid rains, the pH of rainwater is approximately ___.

What is the difference between reflex action and voluntary action?

Amoeba and Volvox do not require any respiratory pigment to transport oxygen. The possible reason could be________.

How does sexual reproduction in plants take place?

Protein has definite shape in certain pH and temperature. what is the role of it during hydrolysis of fat protein and carbohydrates?

(a) What is the lymphatic system? What are its functions?
(b) What is blood pressure? What are the two factors used to express the blood pressure of a person?
(c) Name the main nitrogenous waste in the human blood. How is it removed from the blood?

Consider that round seeded trait is dominant over wrinkled seeded. What is the phenotype of heterozygous plants?

Common type of gibberellins is

Question 9 (ii)

Carry out the following osmosis experiment:

Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,

(a) Keep cup A empty

(b) Put one teaspoon sugar in cup B

(c) Put one teaspoon salt in cup C

(d) Put one teaspoon sugar in the boiled potato cup D.

Keep these for two hours. Then observe the four potato cups and answer the following:



(ii) Why is potato A necessary for this experiment?

Why do some people need to use a dialysis machine ? What does the machine do ?

Salk’s vaccine is used to build immunity against__________.

Therapists use a variety of techniques to help individuals cope with work related stress. One of these is 'positive' memory', where you are encouraged to think of a happy, life-enhancing memory whenever you feel overwhelmed by stress. A similar approach is 'positive imaging', where you are directed by the therapist to look at the best-case scenario. When we are stressed it is too easy to take the overwhelmingly negative viewpoint - to see everything in terms of black and grey. Positive imaging encourages individuals to think about the good things that can come out of any situation

There are two techniques used by therapists to cope with work related stress.= One is positive memory, when a person who is stressed out is made to think of a happy memory.= Another approach which is different from positive memory, is positive imaging, where a person is made to look at the most positive scenario.

B. Among the various techniques used by therapists to help people combat work related stress are 'positive memory' and 'positive imaging'. In the former technique the stressed out person is made to think of a happy memory. The latter is similar to the former, here the stress victim is made to look at the best case scenario thereby preventing the person from falling a pray to negative thinking.

C. One can suppress one's negative feelings with the help of positive memory and positive imaging where a person is made to imagine a positive situation that is likely to take place in the future.

D. Therapists help individuals to cope with related stress using two different techniques, positive memory and positive imaging.With the help of these techniques the individual is made to suppress his negative thoughts and live in an imaginary would of positive thinking.

Seeds swells when placed in water because of :

Identify the part of the brain described below

Explain cardiac cycle and breathing rate.

Question 3

What are the changes seen in girls at the time of puberty?

The “lub” sound (first heart sound) is caused by the

What was wrong with Fox's school initially?

According to Darwin, evolution is a _____ and _____ process.

Which of the following eye defect is due to the non-formation of the pigment rhodopsin?

The extinct human who lived 40,000 - 100,000 years ago, in Europe, Asia and parts of Africa, having a short stature, heavy eyebrows, retreating foreheads, large jaws with heavy teeth, stocky bodies and a lumbering gait were:

Statement 1: Wind energy can replace all other sources of energy.
Statement 2: Installation cost for harnessing wind energy is very low.

Which of the following blood component is responsible for clot formation?

Name the following pollutants :

(i) A pollutant which is mainly responsible for causing acid rain

(ii) Any two chemicals leading to the formation of ozone holes.

(iii) The chemical element which caused Minamata disease in Japan.

What are electrochemical cells? Give some examples.

Give reasons for the following observation: The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close. [2 MARKS]

Why don't the gustatory and olfactory receptors not work during the time of fever or cold?

The figure below compares a part of our eye with a part of a photographic camera
(a) Name the corresponding parts of the eye and the camera shown here that are comparable in function.
(b) Explain the mode of working and the functions of the parts of the eye mentioned above.

(a) For how much time does menstruation last in human females (or women)?
(b) What is the frequency of menstrual cycle in human females (or women)?

The portion of the brain which regulates heat is known as