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The diagram below represents a set-up that was used to investigate the effect of rotation on the growth of a bean radicle. The set-up allowed...

      

The diagram below represents a set-up that was used to investigate the effect of rotation on the growth of a bean radicle. The set-up allowed the seedling to rotate slowly and continuously for seven days.

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(a) Name the piece of apparatus illustrated.

(b)
(i) State the observation made on the shape of the radicle after seven days
(ii) Explain the observation in (b) (i) above

(c) Suggest a suitable control for this experiment.

(d) Give any four importance of tropism in plants.

  

Answers


Martin
a)klinostat/clinostat;

b)
i)the radicle remains /grow horizontally;

ii)rotation of klinostal causes uniform distribution of auxins/ indoleacetic acid; hence uniform growth/clongations (no curvature formed); c)the experiment repeated but with stationary klinostat;

d)
-(tropism)enable plants to get water-hydrotropism;
-chemotropism aids plants in fertilization and nutrients absorption;
-thigmotropism enable weak plants to obtain support
-phototropism enable plants to obtain light for photosynthesis;
-geotropism enables the roots grow down the soil towards the centre of the earth thus providing support to the plant
marto answered the question on October 7, 2019 at 09:34


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