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Meghna Thapar 5 years, 10 months ago
Xerophytic plants found in arid regions have needle like leaves covered with thick waxy layer called cuticle and sunken stomata to prevent loss of water from their surface. Their stems are modified to perform the function of photosynthesis.
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Lalit Lalit 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
| Plant Cell | Animal Cell |
| Cell wall is present. | Cell wall is absent. |
| Plastids are found in plant cell. | Plastids are absent in animal cell. |
| A mature plant cell has a large central vacuole. | An animal cell has many small vacuoles. |
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Yogita Ingle 6 years, 4 months ago
Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. The curd forms because of the chemical reaction between the lactic acid bacteria and casein. During fermentation, the bacteria use enzymes to produce energy (ATP) from lactose. The byproduct of ATP production is lactic acid. Lactic acid acts on the globular proteins present in the milk and denatures them. This denaturation destroys the tertiary and quaternary structures of proteins and the globular proteins are converted into fibrous proteins thus giving a thick texture to the milk due to coagulation of the proteins.
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Yogita Ingle 6 years, 5 months ago
Harmful effects of microorganisms:
- Bacteria: Causes various diseases such as typhoid, diarrhea, and cholera.
- Fungi: Causes a large number of diseases in plants and in animals such as rust diseases in plants, fruit rot in apple, red rot in sugar cane and ring worm disease in human beings.
- Algae: Algal boom in water (rapid growth of algae) causes poisonous effect after they die, which in turn results in the death of aquatic organisms.
- Protozoa: Causes Amoebic dysentery, pyorrhoea and sleeping sickness etc.
- Virus: Cause small fox, common cold, influenza, herpes, hepatitis, polio and rabies.
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Meghna Thapar 5 years, 10 months ago
Frictional force plays an important role in our life. In some cases it is useful whereas if it is harmful and we need to reduce it.
Advantages of friction:
- We are able to walk on ground because friction between the sole of our shoes and ground prevents us from slipping over the ground.
- Friction between tyres of a car and the road enables a car to move forward on road without skidding.
- The brakes of a car or a bicycle work by friction.
- We are able to write and make drawings on paper because there is friction between the tip of pencil and paper.
- We can hold a glass tumbler in our hands because of friction between the glass tumbler and our hands.
- We are able to fix nails in a wall due to friction.
Disadvantages of friction:
- Friction wears away the soles of our shoes.
- The tyres of vehicles wear out gradually due to friction.
- Friction wears out the rubbing machine parts.
- Friction wears out the brake pads of vehicles gradually.
- Friction wears out steps of staircases in buildings and foot over-bridges.
- Friction produces heat which may damage machines.
Posted by Lakshita Nagpal 6 years, 5 months ago
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Yogita Ingle 6 years, 4 months ago
Since deciduous plants lose their leaves to conserve water or to better survive winter weather conditions, they must regrow new foliage during the next suitable growing season; this uses resources which evergreens do not need to expend.
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