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Meghna Thapar 5 years, 10 months ago
- The force which always opposes the motion of one body over another body is called frictional force or friction.
- The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.
- The pull exerted by objects possessing mass is called gravitational force.
Posted by Parth Kamble 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
- The process by which plants make their own food in the presence of sunlight, carbon-dioxide present in air, water, minerals and chlorophyll present in leaves is termed as photosynthesis.
- Plants take up carbon-dioxide from the atmosphere through the tiny pores known as stomata present on thesurface of the leaves and surrounded by ‘guard cells’.
- The process of photosynthesis releases oxygen in the atmosphere during the synthesis of food.
- Plants absorb the water and minerals from the soil with the help of deep penetrated roots inside the soil and transport them to the leaves of the plants where synthesis of food takes place.
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Yogita Ingle 6 years, 7 months ago
Cell wall: Cell wall is made of cellulose. It is somewhat hard but permeable to most of the substances. Cell wall is available in plant cells and in cells of bacteria and fungi.
Plasma membrane: Plasma membrane is a semi-permeable membrane. It is composed of bilayer of lipid and protein.
Nucleus: Nucleus is covered by double membrane; called nuclear membrane. The fluid which is inside the nucleus is called nucleoplasm.
Mitochondria: Mitochondrion is a capsule-like structure. It is a double membrane structure. Its inner membrane is projected into numerous finger-like structures; called cristae.
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Yogita Ingle 6 years, 8 months ago
- Fungi are eukaryotic, non-vascular, non-motile and heterotrophic organisms.
- They reproduce by means of spores.
- Fungi exhibit the phenomenon of alteration of generation.
- Fungi store their food in the form of starch.
- Biosynthesis of chitin occurs in fungi.
- The nuclei of the fungi are very small.
- During mitosis, the nuclear envelope is not dissolved.
Posted by Arun Kumar 6 years, 8 months ago
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Meghna Thapar 5 years, 10 months ago
The inner walls of small intestine have millions of tiny, finger-like outgrowths called villi which increase the surface area for rapid absorption of digested food. Each villus has a network of blood vessels which absorbs the digested food materials into the blood flowing through them.
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Yogita Ingle 6 years, 8 months ago
The process of digestion begins in the mouth where food is mixed with saliva and chewed. It is broken down into small chunks before being swallowed. The mouth is also known as the buccal cavity or the oral cavity. The mouth has many accessory organs such as the tongue, teeth, and salivary glands, which help in the digestion of food. Teeth grind the food into small pieces. Salivary glands secrete saliva which contains an enzyme called the salivary amylase. This enzyme breaks down starch content and moistens the food, before the tongue and other muscles push the food into the pharynx.
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Yogita Ingle 6 years, 8 months ago
| Parasite | Saprotroph |
| The organism that grows on the body of another organism and derives nutrients from it is known as a parasite. | The organism that obtains nutrients from the dead or decaying organic matter is called saprotroph. |
| They take the readymade food from the host. | They take the digested and decayed food. |
| They directly feed on living organisms for their nutrition. | They feed on dead and decaying organism. |
| Examples- Cuscuta and orchids. | Examples- Fungi and some bacteria. |
Tripti Rawat 6 years, 8 months ago
Posted by Divyansh Jain 6 years, 8 months ago
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Meghna Thapar 5 years, 10 months ago
Parasites totally depend on their host to fulfill all their requirements. These requirements include growth, survival, and reproduction. Since they totally depend on the host, they are referred to as total parasites or holoparasites. Partial parasites depend on their host for a few requirements. Partial parasites are also referred to as hemiparasites. They do not depend on the host for nutrition, but only for water and habitat. Partial parasites are usually photosynthetic since they contain chlorophyll. Therefore, they produce their own food. Hence, partial parasites are not completely harmful when compared to parasites (total parasites).
Posted by V Srinidhi Dasari 6 years, 8 months ago
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Pratik Bhamre 6 years, 8 months ago
Yogita Ingle 6 years, 8 months ago
6 CO2 + 12 H2O + photons (energy) → C6H12O6 + 6 O2 + 6 H2O
(Carbon dioxide + Water + Light energy → Glucose + Oxygen + Water)
Divyansh Jain 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
Manure and fertilisers replenish the soil by supply nutrients to the soil.
*Manure is the organic matter added to the soil to replenish it with nutrients. The wastes from household, animal dung and agricultural wastes are buried in small pits. Decomposition by bacteria and earthworms occurs in these pits converting organic wastes into manure. Manure increases the water retention capacity of soil.Manure is ecofriendly and replenishes the soil with nutrients which can persist for longer time whereas fertilisers though not ecofriendly supply nutrients for immediate usage by the plants.
*Fertilisers supply specific type of nutrients for the plant. Fertilisers are the chemicals which add minerals like potassium, phosphorus and nitrates to the soil.
Posted by Divyansh Jain 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
Speedometer: Measures and displays instantaneous speed of the vehicle.. When your car is not moving the speedometer will show 0 Km/hr. When it begins to move it may show 10 Km/hr. You put it in 3rd gear and after some time you may see 50 km/hr. If you apply brakes you will observe that the pointer of the speedometer is moving towards the zero. Reading of a speedometer always fluctuates or changes depending on the way you drive the car. It may momentarily show a constant speed if you drive with a constant speed.
Odometer: Measures and displays distance travelled by the vehicle. The reading of an odometer always increases. Suppose your car was showing 2150 Km in its odometer. You travel to a nearby town and observe that the new reading is 2250 Km. The distance you covered to reach the town is (2250 - 2150) = 50 Km & the total distance your car has travelled from the day you bought it is 2250 Km.
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Khushi Babhare 6 years, 8 months ago
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