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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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Match the hormone with the description.

_____ ethylene a. efflux carriers set up gradients
_____ cytokinin b. produced in positive and negative feedback loops
_____ auxin c. affects expression of more genes than any other hormone
_____ gibberellins d. works antagonistically to auxin in apical dominance
_____ ABA e. big in stems
_____ nitric oxide f. active in bursts

Summary Introduction

To match: The hormones with the description.

Explanation

Ethylene - b. produced in positive and negative feedback loops.

There are two main enzymes that are involved in the production of ethylene in the plant body. This in turn is encoded by slightly different genes. Expression of some of these genes is enhanced (positive feedback loop), and some are inhibited (negative feedback loop) by ethylene itself. This maintains the ethylene level in the plant body.

Cytokinin - d. works antagonistically to auxin in apical dominance.

Cytokinin in the plant tissue always opposes the effect produced by auxin. So there should be a combination of auxin and cytokinin that is the concentration of auxin should exceed the concentration of cytokinin, otherwise it would block apical dominance produced by auxin.

Auxin - a. efflux carriers set up gradients.

As efflux carriers in an actively lengthening shoot system are located at the bottom of the stem, auxin moves from shoot meristem to the bottom and in young root tips, efflux carriers direct the movement of auxin in a just opposite direction...

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