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Microspore

Definition

noun, plural: microspores

(botany) The smaller spore produced by sporophytes and develop into male gametophyte

(botany) A developing pollen grain at the uninucleate stage in seed plants


Supplement

In botany, a microspore refers to the spore produced by sporophytes. It is haploid and gives rise to a male gametophyte. Metagenesis or the alternation of generations involves the alternation of life phases in the life cycle of plants. The sporophyte, in particular, produces spores (thus the name) to give rise to the next phase, which is the gametophyte. Gametophytes, on the other hand, produce gametes that give rise to sporophytes. A mature sporophyte produces spores by means of meiosis. The diploid sporophyte thus bears spores that are haploid, i.e. the number of chromosomes is half of the number of those of a sporophyte. The spore produced by sporophytes may be a microspore or a megaspore. The microspore is generally smaller in size compared with the megaspore. And the microspore develops particularly into a haploid male gametophyte. The megaspore, in comparison, develops into a haploid female gametophyte.


Word origin: Greek mikros (small) + Greek sporá (sowing, seed)

See also:

Related term(s):

  • microsporic (adjective)

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some bio multiple choice questions

... organ, the nucleus that enters the synergid first is called the a. sperm nucleus. b. generative nucleus. c. tube nucleus. d. pollen nucleus. e. microspore. Answer says C. but I'm pretty sure it's A. Can anyone confirm? 5. Vernalization a. is of little importance to agriculture. b. refers to ...

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by jjkwest1
Fri Feb 10, 2012 8:00 am
 
Forum: Botany Discussion
Topic: some bio multiple choice questions
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Views: 6406

help with some questions

... seed -the fertilized antipodals develop into the seed coat Which most closely represents the male gametophyte of seed-bearing plants? -ovule -microspore mother cell -pollen grain -embryo sac -fertilized egg thanks!

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by nile_opeth
Thu May 03, 2007 12:56 am
 
Forum: Botany Discussion
Topic: help with some questions
Replies: 2
Views: 2507

Homosporous and Heterosporous plants.....help! + generations

Thank you very much. The lecturer today actually mentioned today that when the pollen grain has only 1 nucleus, it is a microspore, but when this nucleus seperates into the tube nucleus and male generative nucleus, it is the microgametophyte. Neat stuff. Hehe Thanks :)

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by unrealfighter
Thu Nov 02, 2006 2:55 pm
 
Forum: Botany Discussion
Topic: Homosporous and Heterosporous plants.....help! + generations
Replies: 5
Views: 18096

Reproduction in Flowering Plants

Process of microspore formation (microsporogenesis) Male spore development begins with:microsporangia or microspore mother cell * is diploid * is found in a pollen sac of the anther * undergoes meiosis * and produces 4 microspores ...

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by chepay118
Sat Mar 25, 2006 2:10 am
 
Forum: Botany Discussion
Topic: Reproduction in Flowering Plants
Replies: 2
Views: 3457

Reproduction in Flowering Plants

Please help me in answer this questions: 1.Explain what megaspore formation is! Show the pathway of megaspore formation? 2.Explain what microspore formation is! Show the pathway of microspore fomation! 3.Explain the double fertilization process in plants? PLease answer this questions as fast ...

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by rama
Tue Mar 21, 2006 10:12 am
 
Forum: Botany Discussion
Topic: Reproduction in Flowering Plants
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Views: 3457
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