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Meghna Thapar 5 years, 6 months ago
Due to the earth's rotation, stars appear to move. As the Earth rotates from west to east, the stars appear to rise in the East, moving across south to set in the west. The Sun will appear to move through the stars, making one complete circuit of the sky in 365 days. There are 88 constellations that make up the sky. We see constellations at different times of the year - spring, summer, fall, & winter. This occurs because the Earth is orbiting the Sun. In summer, we see the opposite (we see Scorpius at night and Orion is in the sky during the day). This is why you cannot see Orion or any one constellation all year long.
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Yogita Ingle 7 years, 4 months ago
Many events can't be predicted with total certainty. The best we can say is how likely they are to happen, using the idea of probability.
When a coin is tossed, there are two possible outcomes:
- heads (H) or
- tails (T)
We say that the probability of the coin landing H is ½
And the probability of the coin landing T is ½
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Meghna Thapar 5 years, 6 months ago
Friction is a force that holds back the movement of a sliding object. Friction is defined as the force that opposes the motion of a solid object over another. There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction. Friction is the force that resists motion when the surface of one object comes into contact with the surface of another. In a machine, friction reduces the mechanical advantage, or the ratio of output to input: an automobile, for instance, uses one-quarter of its energy on reducing friction.
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Meghna Thapar 5 years, 6 months ago
Heterotrophic nutrition is that mode of nutrition in which an organism cannot make its own food from simple inorganic materials like carbon dioxide and water, and depends on other organisms for its food.
Example: All animals obtain food by heterotrophic nutrition.
Some of the important types of heterotrophic nutrition are:
(i) Saprophytic nutrition: It is that nutrition in which an organism obtains its food from dead organic matter of dead plants, dead animals and rotten bread.
Example: Fungi and many bacteria obtain food by saprophytic nutrition.
(ii) Parasitic nutrition: It is that nutrition in which an organism derives its food from the body of another living organism (called its host) without killing it.
Example: Plasmodium, round worms and Cuscuta obtain food by parasitic nutrition.
(iii) Holozoic nutrition: It is that nutrition in which an organism takes the complex organic food materials into its body by the process of ingestion; the ingested food is digested and then absorbed into the body cells of the organism.
Example: Human beings and Paramecium.
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Sonali Aggarwal 7 years, 4 months ago
The Permanent Settlement (also Premanent Settlement of Bengal) was introduced by Lord Cornwallis in 1793. It was an agreement between the British East India Company and the Landlords of Bengal to settle the Land Revenue to be raised. Lord Cornwallis came to India as the Governor General.
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Meghna Thapar 5 years, 6 months ago
Isomers are molecules that have the same molecular formula, but have a different arrangement of the atoms in space. That excludes any different arrangements which are simply due to the molecule rotating as a whole, or rotating about particular bonds. Butane and isobutane have the same number of carbon (C) atoms and hydrogen (H) atoms, so their molecular formulas are the same. However, each one has a different structural formula, which shows how the atoms are arranged. So we can say that butane and isobutane are structural isomers.
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Rujul Patil 7 years, 4 months ago
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