The motion of a bullet fired from a gun (up to some distance). March past of the soldiers on a straight road. A boy or a car running on a straight road. . . .
If a motion of a body is along a straight line, it is said to be the rectilinear or linear motion. Example: A stone falling straight towards the surface of the earth A car moving on a straight road. A coin moving over a carom board. . . .
Translatory Motion can be of Two types: Rectilinear Motion Curvilinear Motion . . .
If an object like a vehicle, moves in a line in such a way that every point of the object moves through the same distance in the same time, then the motion of the object is called translatory motion. Example: When a cycle moves from a position 1 to the position 2. The motion of an apple falling from a tree. The motion of . . .
Different object have different type of motion. For example, a train moves straight along its track, a fan rotates, the earth revolves arount the sun. There can be many more such examples. These different kinds of motion can be classified into the following types. Translatory Motion Rotatory Motion Circular Motion Oscillatory Motion Vibrat . . .
Modification of stem Stem undergoes modification to perform various functions Underground modification of stem Some stems grow below the ground. These stems are called underground stems.it can store food in large quantity though the plant is weak. Tuber- the lower branches of potato stem grow underground and swell up at the tips to store foo . . .
Some special functions of roots Nitrogen fixing roots- in leguminous plants (gram, pea) roots develop small swellings called nodules. Which contain bacteria. These bacteria fix nitrogen of the soil into soluble nitrates which increase the fertility of soil. Breathing roots or pneumatophores- in plants which are found in marshy or water-logged land . . .
Q. Write the useful and harmful effect of protozoa. Answer: Useful and harmful effects of Protozoa: Useful effects of protozoa: 1. Some protozoa are symbiotic in nature, thus help in benefitting other organisms in many ways. 2. They are useful for students who are learning cytology. Harmful effects of protozoa: 1. Trypanosoma brucei, a . . .
Q. What is mixotrophic nutrition? Ans.- Mixotrophic nutrition: Euglena a green coloured aquatic protozoan shows a different type of nutrition mode. It bears chlorophyll, thus in presence of light its food itself i.e., shows autotrophic nutrition. But when light is not enough, such as in deep water, it engulfs other microbes present in water for fo . . .
An object can be in motion relative to one set of object while at rest relative to some other set of object. Thus, rest and motion are relative Example: Suppose you are sitting in a room. You are at rest in relation to all other stationary objects inside the room.But the room (or home) is on earth and the earth itself is not at rest. The earth revolv . . .
Motion: A moving objects keeps on chnging its position continuously with time with respect to a fixed point called the reference point. When the position of a body with respect to its surrounding changes with time the body is said to be in motion.. Example: When a moving car chnages its position with respect to a tree or a lamp post by the side of th . . .
Rest: A body is said to be at rest if it does not change its position with respect to a fixed point in its surrounding. When the position of a body with respect to its surrounding does not change with time, the body is said to be at rest Example: A book lying on the table will not change its position if it is not disturbed and will be considered to b . . .