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(D) All the above

Synthetic fibres are different from the natural fibres. They melt on heating. If the clothes made of synthetic fibres catch fire, it can be very dangerous. The fabric will melt and can stick to the body of the person wearing it. Hence, we should not wear synthetic clothes while working in a kitchen or working in a laboratory.

Terylene is a kind of a polyester.

C) Direction of gas

15gm/100 ml blood

In humans, tidal volume is about 500ml

Anemia is caused when the amount of hemoglobin in the blood decreases.

Water is eliminated from the body in the form of Sweat & urine

Carbon dioxide and water

Maintenance of internal equilibrium by removal of harmful materials is called homeostasis.

Carbon dioxide formed by the cellular respiration combines with water present in and out of the cell to form carbonic acid and this increases the activity in the body, which in turn changes the internal environment.

The Carbamino hemoglobin & bicarbonate changes back to carbon dioxide in the lungs.

The respiratory system helps in the maintenance of homeostasis by eliminating carbon dioxide.

The muscular separates of thoracic and abdominal cavities is Diaphragm

Pleural fluid seen in between the membraneous layers prevents friction between lungs and walls of the thoracic cavity. ‘

Respiratory system takes place in the exchange of gases is Alveoli

The surface area of the skin are covers the entire body is 2 sq. mtrs

Pleura is the double-layered protective membrane of the lungs.

Alveoli increase the respiratory surface area in lungs. The large surface area help in the easy exchange of respiratory gases.

(a) Vasectomy

Cholesterol is synthesised in Liver.

The number of teeth that grow twice in the human life is 20.

Enzyme trypsin is secreted by Pancreas.

The ability of the eye lens to adjust its focal length to see nearby and distant objects clearly.

The female gametophyte or the embryo sac develops, from a single functional megaspore. This is known as monosporic development of the female gametophyte. In most flowering plants, a single megaspore mother cell present at the micropylar pole of the nucellus region of the ovule undergoes meiosis to produce four haploid megaspores. Later out of these 4 megaspores, only one functional megaspore develops into female gametophyte, while the remaining 3 degenerates.

(i) Cerebellum: It is responsible for the precision of voluntary actions and maintaining the Posture and balance of the body.

(ii) Fore-brain: Thinking 

(iii) Medulla : Controls involuntary actions like blood pressure, salivation and vomiting.

(i) A-Pituitary

B - Thyroid

C - Adrenal

D - Pancreas

E- Ovary

F- Testis

(ii) Pancreas: Secrete insulin which controls the amount of sugar in the blood. 

Testis: Secrete testosterone which controls sperm production/secondary sexual character.

The stranger was the thief who had once entered the gentleman’s house on the occasion of his birthday.

अजनबी व्यक्ति पहले चोरी करता था। वह एक चोर था। एक बार वह उस भले आदमी के घर में चोरी करने उसके जन्मदिन के अवसर पर आया था।

The gentleman was an old man and his eye sight was weak. So he was unable to recognize the stranger.

वह भद्र पुरुश एक वृद्ध व्यक्ति था और उनके देखने की क्षमता भी क्षीण पड़ गई थी। यही वजह है कि वह उस अजनबी व्यक्ति को पहचानने में असमर्थ था।

The traits that are obtained from parents are inherited traits. e.g., Fused and free ear lobes.  The traits that develop during the lifetime of an the individual has acquired traits.

Example: Muscular body of a wrestler.

k = C + 273 

= – 20 + 273 

– 20°C = 273 K

C=P.Q’+P.R+Q.R’

POS =x'y'z' + x'yz' +x'yz+ xy'z + xyz'

=∑m(0,2,3,5,6)

(c) will be less than the earlier value. 

L.H.S P' + Q' R

= P' (Q + Q') (R + R') + Q'R (P + P')    (Simplification)

= P'QR + P'QR' + P'Q'R + P'Q'R' + PQ'R +  P'Q'R

= P'QR + P'QR' + P'Q'R + P'Q'R' + PQ'R

=P'Q'R' + P'Q'R' + P'QR + P'Q'R + PQ'R

=R.H.S

L.H.S

X' + Y' .Z

= X' .(Y + Y'). (Z+ Z') + (X + X') . Y' .Z

=X' .Y. Z + X'. Y. Z' + X' .Y' .Z' + X. Y'. Z + X'. Y'. Z

= X' .Y. Z + X' .Y. Z' + X' .Y'. Z + X'. Y'. Z' + X. Y'. Z

= X'. Y .Z + X' .Y. Z' + X' .Y'. Z + X'. Y'. Z' + X. Y'. Z

=R.H.S

OR

R.H.S

X' . Y'. Z' + X'. Y. Z' + X'. Y .Z + X' .Y '. Z + X. Y' .Z

= X' .Y'. Z + X' .Y' Z' + X. Y. Z + X' . Y .Z' + X. Y' .Z

=X'. Y'.(Z + Z') + X' .Y. (Z + Z') + X. Y'. Z

= X'. (Y' + Y) + X. Y' .Z

= X' . + X. Y'. Z

= (X' + X). (X' + Y'. Z)

= X' + Y' .Z

= L.H.S

(c) λ_e < λ_p = λ_n > λ_α

Animal figures, model cart ,marbles,dolls,whistles and plough are some of the terracotta toys mentioned in this lesson. I think, children would have liked playing with the model cart the most. Even today; most of the children enjoy playing with toy cars.

The main parts of the circulatory system are:

• Heart

• Blood vessels and

• Blood.

(a) various kind of work.

(b) Megaliths are found in Deccan ,south India , in the north- east and Kashmir.

(c) Stone circles or boulders on the surface were used to cover the burial places.

(d) Port-holes were used for entering the burial places.

(e) People at Inamgaon ate Fruits, cereals and meat.

1. Beside food, oxygen and waste materials, circulatory system transports Hormones to various parts of the body.

2. Arteries are the blood vessels which usually carry oxygenated blood.

3. The chamber of heart which pumps blood into aorta is Left ventricle. 

4. Arteries are Thick walled and the veins are thin walled vessels.

5. The blood vessel which transports blood from heart to an organ is called Artery.

1. The iron pigment Haemoglobin gives red colour to the blood.

2. The Heart is the most powerful organ in the circulatory system.

3. The average heartbeat rate is 72 beats per minute in human being.

4. In man (human), heart has Four chambers.

5. The erythrocytes contain an iron-rich pigment called Haemoglobin.

The Rh-factor was first discovered in the Rhesus monkey. It was found that Rh (rhesus) antigens were causing many of the transfusion failures that were unexplained by A-B-O system. There are at least eight different Rh antigens so far. The person bearing Rh-factor is Rh^+ve and person who does not possess this factor is Rh^-ve.

RBC are formed in the liver and spleen when the organisjn is foetus. After birth  these are formed in the red bone marrow. At the time of formation of RBC’s they have  nucleus but later on they loose nucleus. Those enucleated cells perform all the  functions of a cell so these are called cells.

RBC’s are surrounded by semipermeable plasma membrane. It contains homogenous  cytoplasm and it is without the nucleus, endoplasmic reticulum, mitochondria,  ribosomes and centrioles. RBC’s get advantage due to this condition. Corpuscles have  more space to hold haemoglobin. It can as well give more oxygen by the haemoglobin  to the tissue cells. So the enucleated condition is more useful to the tissue cells. The  necessity of work has made them without nucleus and perform all the functions of the  cells so they are called cells.

A fluid that transports fatty acids and glycerols is Lymph.

It is the selection within a population resulting from the influence exerted by the environment. It leads to a change in the composition of genes within a population.

The mineral element essential for the clotting of blood is calcium.

(C) Both A & B

(ii) groups 2, 13 and 14