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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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Meiosis of cells in pollen sacs forms haploid _________.

  1. a. megaspores
  2. b. microspores
  3. c. stamens
  4. d. spomphytes

Summary Introduction

Introduction: A flower is the reproductive part of the modified thick shoot of an angiosperm plant. In flowers, by the meiosis process, spores are produced; they can develop into haploid gametophytes to produce gametes. Megaspores develop into female gametophytes and microspores develop into male gametophytes. Microspores are the haploid spores which produce a pollen grain. They are produced when the diploid cell undergoes meiosis inside the pollen sacs of anthers.

Explanation

Reason for the correct answer:

Microspores grow into male gametophytes.  The male gametes’ production starts as masses of diploids when the anthers produce the spore-producing cells through mitosis. Around these masses, walls develop to produce four pollen sacs. Each of the cells undergoes cytoplasmic division and meiosis within the pollen sacs to produce four haploid microspores. Pollen grains are formed by the differentiation and mitosis of a microspore. There are two cells present in the pollen grain.

Option b. is given as “microspores”.

Microspores are haploid spores which produce pollen grains. They are produced when the diploid cell undergoes meiosis within the pollen sacs of anthers.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as, “megaspores”.

Megaspores are the four haploid spores that produce an egg-producing gametophyte...

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