Chapter 23, Problem 33A

Summary Introduction

Introduction :

Fertilization is just the beginning of a long phase that concludes finally with seed forming. A seed in anthophytes is part of a fruit that grows from the ovary, and also from other organs of the flower.

Answer to Problem 33A

Correct answer :

The correct answer is option (b) dormancy

Explanation of Solution

Explanation/justification for the correct answer :

Option (b) dormancy. Many seeds formed at the end of the growing season enter dormancy which is a period of little or no development. Dormancy is an adaptation which raises the seeds survival rate when exposed to harsh conditions. So, the correct answer is option (b).

Explanation for incorrect answer :

Option (a) alternation of generations. Alternation of generation is the kind of life cycle occurring in those plants with distinct haploid sexual and diploid asexual stages. So, this is an incorrect answer.

Option (c) fertilization. Fertilization is the process in which the fusion of the gametes from the parents takes place in the ovule of the female gametophyte. So, this is an incorrect answer.

Option (d) pahotoperiodism. In phototropism a plant bends or expands in response to the light directionally. Shoots typically move in the direction of the light; roots normally turn down. So, this is an incorrect answer.