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BIOL 325 Final Exam Questions and Answers 2024 $13.49   Add to cart

Exam (elaborations)

BIOL 325 Final Exam Questions and Answers 2024

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  • Course
  • BIOL 325
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  • BIOL 325

what are theca? - The typical anther is bilocular, i.e. it consists of two thecae. Each theca contains two microsporangia What are microsporangia? - Are the pollen sacs. Microsporangia produce the microspores, which for seed plants are known as pollen grains How many theca and sporangia are p...

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  • August 26, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIOL 325
  • BIOL 325
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BIOL 325 Final Exam Questions and
Answers 2024
what are theca? - The typical anther is bilocular, i.e. it consists of two thecae. Each
theca contains two microsporangia


What are microsporangia? - Are the pollen sacs. Microsporangia produce the
microspores, which for seed plants are known as pollen grains


How many theca and sporangia are part of each anther? - Theca: 2
Microsporangia: 4


What separates the two theca? - A longitudinal groove


What are the pollen sacs lined with? - tapetum cells


What are tapetum cells? - Nutrition


What is microsporogenesis? - After meiosis haploid microspores in the pollen sacs
undergo several changes
-Microspore divides once by meiosis to produce two cells
-small generative cell is formed inside larger cell
-Tetrad of microspores separate from each other
-A two-layered wall develops around each spore
-in 2/3 of flowering plant species pollen grain is released at the 2 cell stage

, -For others, the generative cell divides to produce 2 sperm resulting in a 3-celled
microgametophyte


What is reduced male gametophyte? - Another apomorphy of angiosperms is a
reduced 3-celled male gametophyte- no other plant group has a male gametophyte
so reduced in cell number


What is Mature microgametophyte? - germinated pollen grain, with tube nucleus
and 2 sperm cells


What is pollination? - Transfer of the pollen grains to the stigmas.
-Pollen grains hydrate
-Germinate: forming pollen tube
-Pollen tube grows through stigma to ovules


What happens if the generative cell remains undivided? - Divides to form 2 sperm
cells


What is double fertilization? - -Pollen tube enters ovule through micropyle
-then enters 1 of the synergids
-2 sperm and tube nucleus discharged into synergid
-1 sperm enters the egg cell- fertilization
-Other sperm enters central cell and unites with 2 polar nuclei
-tube nucleus, remaining synergid and antipodals degenerate


Definition of double fertilization - The union of one sperm with the egg and the
other with the polar nuclei is called double fertilization

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