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.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter23: Protists

Section: Chapter Questions

Problem 6RQ: Mitochondria most likely evolved by ___________ . a photosynthetic cyanobacterium cytoskeletal...

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