B. Using the illustrations above, arrange the following statements to explain the process of pollen formation in angiosperms. Use numbers 1 (first) to 7 (last). Microgametogenesis _4. The generative cell subsequently detaches from the pollen grain wall and is engulfed by the vegetative cell forming a unique 'cell within a cell' structure. _5. Each microspore will form large vacuole displacing the microspore nucleus to an eccentric position against the microspore wall. _6. The nucleus undergoes first pollen mitosis which results in the formation of two unequal cells, a large vegetative cell and a small generative cell each containing a haploid nucleus. _7. The generative cell divides by mitosis to form two sperm cells completely enclosed within the vegetative cell cytoplasm. _8. No cytokinesis takes place forming a pollen grain having 3 haploid nucleus, 1 tube nucleus and 2 sperm cells for double fertilization. Microsporogenesis _9. A diploid sporogenous cells differentiate as microsporocytes (pollen mother cells or meiocytes) which divide by meiosis to form four haploid nuclei. 10. Distinct single-celled haploid microspores form after cytokinesis.
B. Using the illustrations above, arrange the following statements to explain the process of pollen formation in angiosperms. Use numbers 1 (first) to 7 (last). Microgametogenesis _4. The generative cell subsequently detaches from the pollen grain wall and is engulfed by the vegetative cell forming a unique 'cell within a cell' structure. _5. Each microspore will form large vacuole displacing the microspore nucleus to an eccentric position against the microspore wall. _6. The nucleus undergoes first pollen mitosis which results in the formation of two unequal cells, a large vegetative cell and a small generative cell each containing a haploid nucleus. _7. The generative cell divides by mitosis to form two sperm cells completely enclosed within the vegetative cell cytoplasm. _8. No cytokinesis takes place forming a pollen grain having 3 haploid nucleus, 1 tube nucleus and 2 sperm cells for double fertilization. Microsporogenesis _9. A diploid sporogenous cells differentiate as microsporocytes (pollen mother cells or meiocytes) which divide by meiosis to form four haploid nuclei. 10. Distinct single-celled haploid microspores form after cytokinesis.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:Microsporogenesis,
Callose wall
Diploid (2n) nucleus
Haploid (1n) nuclei
Microspores
Meiosis I
Meiosis ir
Microsporocyte
Tetrad
Vegetative nucleus
Microspore nucleus
Vacuole
Generative cell
Yegetative nucleus
Pollen
Mitosis I
Pollen
Mitosis II
Sperm
'cells
Released
Polarised
Bicellular
Tricellular
microspore
microspore
pollen
pollen
Microgametogenesis
Transcribed Image Text:B. Using the illustrations above, arrange the following statements to explain the process of
pollen formation in angiosperms. Use numbers 1 (first) to 7 (last).
Microgametogenesis
_4. The generative cell subsequently detaches from the pollen grain wall and is engulfed by the
vegetative cell forming a unique 'cell within a cell' structure.
5. Each microspore will form large vacuole displacing the microspore nucleus to an eccentric
position against the microspore wall.
_6. The nucleus undergoes first pollen mitosis which results in the formation of two unequal cells, a
large vegetative cell and a small generative cell each containing a haploid nucleus.
_7. The generative cell divides by mitosis to form two sperm cells completely enclosed within the
vegetative cell cytoplasm.
_8. No cytokinesis takes place forming a pollen grain having 3 haploid nucleus, 1 tube nucleus and
2 sperm cells for double fertilization.
Microsporogenesis
_9. A diploid sporogenous cells differentiate as microsporocytes (pollen mother cells or meiocytes)
which divide by meiosis to form four haploid nuclei.
_10. Distinct single-celled haploid microspores form after cytokinesis.
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