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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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The oat coleoptiles on the left have been modified: either cut or placed in a light-blocking tube. Which ones will still bend toward a directional light source?

Chapter 30, Problem 5CT, The oat coleoptiles on the left have been modified: either cut or placed in a light-blocking tube.

Summary Introduction

To explain: Out of the four oat coleoptiles, there is one with a cut at the tip, one’s tip placed inside a light blocking tube, one with its bottom part inside a light blocking tube and one with a vertical cut from its tip, therefore which ones will still bend towards a directional light source.

Concept introduction: Phototropism is directional growth of plants towards a light stimulus. Phototropins are the blue-light receptors that control the photosynthetic efficacy of plants located at the shoot tips that help the plants in this regard. Light source is very necessary for a plant body to carry out many of its major functions.

Explanation
A newly germinated seed has a definite coleoptile from which its shoot system starts to arise. For the normal growth and development of a plant, it is very necessary that its shoot tip is exposed to blue light emerging out of the Sun as it is the exact location of blue-light sensing receptors called phototropins a. If the coleoptile tip of a germinated seed has blocked by any sort of light blocking material, no light can harvest upon the phototropins and thereby no auxin efflux carriers accumulate on the plant regions where it receives least amount of light...

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