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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Germination begins when a seed imbibes water. What are the next key biochemical and developmental events that bring an angiosperm’s life cycle full circle?

Summary Introduction

To review:

The biochemical and developmental events that occur after the seed has imbibed that brings an angiosperm’s life cycle full circle.

Introduction:

The life cycle of a plant species begins with the germination of seed. A seed germinates and a seedling is formed, which grows up to a certain point and then flowers to form fruits and seeds. These seeds germinate on the onset of next season and complete the life cycle of the plant species.

Explanation

The seed has a very little amount of water as it gets dehydrated during seed maturation. It absorbs (imbibes) water and the germination starts. Certain biochemical and development changes occur in the seeds of an angiosperm plant after it has imbibed and the seeds are produced.

The imbibition of seed causes it to swell and the seed coat to rupture, due to which, the oxygen and water easily enters the seed. The enzymes that were produced before dormancy are activated and the gene encoding enzymes are activated as well; more production of enzymes takes place.

The enzymes then cause the breakdown of food and release energy, which the cell utilizes and divides rapidly; the plant grows and a seedling is formed...

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