Question

Please solve q. 4 and 5

Answer 1

4:
when it is against the direction of stimulus it is negative 
and when in favour of direction of stimulus it is positive.
5:
Take some sand in a box. Make sure that the box is big enough.Now take a porous container (smaller that the box) and fill it with H2O. The water will gradually evoperate and also go into the soil.Now take a channa or a bean seed and plant it in the box and cover it with soil. Leave the experiment as it is for a week or so and make sure that u fill the porous container with water at regular intervals.After a week or so, you will notice that roots have started to grow. form the seeds. you will also notice that the roots move in the direction of the container which has water and not merely downwards in the direction of the gravitational pull. Thus from the experiment we can say that Roots show positive hydrotropism and negative geotropism

Answer 2

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