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Chapter - 18, Movement & Locomotion In Living Organisms, , Page No. 148, Q- 1) Identify the wrong statements in the following, correct and write them, i. The movement of bones is due to contraction and relaxation of muscles., = Right, ii., , The movement of plant stems is called positive geotropism., = Wrong, because the movement of plant stems are called phototropism., , iii., , Rose plant shows seismoplasty., = Wrong, rose plant does not shows seismoplasty., , iv., , The movement of roots towards light is called hydrotropism., = Right, , Q- 2) What is tropism?, Ans: - Stem moves in the direction of light, while the leaves of the touch-me-not, plant close when touches thus various parts of the plant show reaction to various, stimuli and this process is called tropism., Q- 3) Plat roots move towards earth. Give reasons., Ans: - Plant root move towards the earth because the roof is attracted by gravity, toward the earth. Also the root is attracted toward water which present down the, earth., Q- 4) Write about the movement of the leaves of Touch - me - not plant., Ans: - The leaves of touch-me-not plant close on touching it and reopen after a short, while. This movement in response to the touch is called seismonasty., Q- 5) Briefly explain the movement of different kinds of micro organisms., Ans: - Movement of different kind of micro-organism are –, ➢ Amoeba is a single-celled animal which moves by forming pseudopodia, ➢ In Euglena there is a single thread-like structure which is used for movement., This is called the flagellum and it helps Euglena in swimming., ➢ Like amoeba, and Euglena, parmoecium is also single-called anima. The entire, surface of his its body is covered with structure called cilia. These the animal, swimming., Q- 6) Write down the uses of muscles in the locomotion of animals., Ans: - The users of muscles in the locomotion of animals are follows –, a) Movement of animal from one place to another is called locomotion. Different, animals use different means of locomotion.

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b) Locomotion in the earthworm is due to the contraction and relaxation of, muscle., c) Mosquitoes and plies fly with the help of their wings. The wings move due to, the movement of muscle attached to them., d) Vertebrates, the animals with backbones, move with the help of their skeletal, and muscular systems., e) Fish move their fins and tails to be swim in water., f) As snake do not have and tails to be swim in water., g) Bats and flying mammals membranous skin stretches between the fore – and, hind limbs. This acts like a wings and help the bats to fly.