Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 26, Problem 1VCQ

Figure 26.8 At what stage dees the diploid zygote form?

  1. when the female cone begins to bud from the tree
  2. at fertilization
  3. when the seeds drop from the tree
  4. when the pollen tube begins to grow

Chapter 26, Problem 1VCQ, Figure 26.8 At what stage dees the diploid zygote form? when the female cone begins to bud from the

Expert Solution & Answer
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Summary Introduction

Introduction:

A cell with a single set of chromosomes is known as haploid while the one with two sets of chromosomes is known as a diploid cell. Most of the cells in higher organisms are diploid except for the gametes that part in fertilization.

Answer to Problem 1VCQ

Correct answer:

The correct answer is option (b).

Explanation of Solution

Explanation for the correct answer:

Option (b) is given as fertilization. Fertilization is the process of fusion of male and female gamete to form a zygote. The gametes have a single set of chromosome and as they fuse the number of chromosomes in the zygote doubles and it becomes diploid. Hence, option (b) is correct.

Explanation for the correct answer:

Option (a) is given as when the female cone begins to bud from the tree. The female cone is diploid and if formed from a sporophyte leaf. Hence, option (a) is incorrect.

Option (c) is given as when the seeds drop from the tree. The seeds are already diploid as they contain an embryo that has formed from the developing zygote. Hence, option (c) is incorrect.

Option (d) is given as when the pollen tube begin to grow. The pollen tube develops from the intine of the pollen grain which is haploid so is the tube. Hence, option (d) is incorrect.

Conclusion

A diploid zygote is formed as a result of fusion of two haploid gametes during fertilization. The male and female gametes are haploid cells containing a single set of chromosomes while a zygote is diploid and contain a pair of each chromosome.

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Why is fertilization in flowering plants called double fertilization?​     two cells in the ovule are fertilized, the egg and the endosperm mother cell   it takes the efforts of two flowers (male and female) to produce seeds   two ovules must be fertilized to form a single seed   one pollen grain fertilizes two ovules   it takes two pollen grains to fertilize a single ovule
Arrange the following flower and fruit development processes in order. (1st step to 5th step)The microspore mother cell produces haploid microspores. => stepThe flower produces pollen grains that will land on the stigma. => StepThe tube cell forms the pollen tube, anchoring on the synergid. => StepFirst sperm will fertilize the egg to form the zygote (becoming the embryo later on). => StepThe ovary wall enlarges forming the pericarp. => Step
Which of the following lettered structures is the female gametophyte?

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