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MODEL PAPER 3 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 35 Marks
Question
i. List three points of difference between nervous and hormonal mechanisms for control and coordination in animals.
ii. How are auxins related with the bending of plant shoot towards unidirectional light? Explain.
✓

Answer

(i)
Nervous mechanisinHormonal mechanism
Transmits information through electrital impulses.Transmits infornation through blood cells.
Affects only a particular part of the body.Affect different organs of the body
Signal transmission is fastSignal transmission is slow
(ii). When light is coming from one side of the plant, auxin diffuses towards the shaded side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards the light.

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