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Questions and Answers
What does the generative cell do during maturation?
What does the generative cell do during maturation?
The generative cell moves inside the tube cell, becoming a free-standing cell.
What is pollination?
What is pollination?
Pollination is the process where a pollen grain is transferred to the stigma.
What does the pollen grain absorb during pollen tube growth?
What does the pollen grain absorb during pollen tube growth?
The pollen grain absorbs water and germinates.
What are the two cells that make up the pollen grain?
What are the two cells that make up the pollen grain?
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How does the generative cell nucleus divide?
How does the generative cell nucleus divide?
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What guides the pollen tube toward the synergids?
What guides the pollen tube toward the synergids?
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Study Notes
Maturation
- During maturation, the generative cell moves inside the tube cell, becoming a free-standing cell.
Sperm Delivery by Pollen Tubes
Pollination
- The microsporangium breaks open, releasing pollen grains.
- A pollen grain is transferred to the stigma during pollination.
Pollen Tube Growth
- The pollen grain absorbs water and germinates, forming a pollen tube.
- The pollen tube delivers sperm to the female gametophyte.
- The pollen grain consists of the spore wall.
- Two cells: the tube cell and the generative cell (inside the tube cell).
Sperm Formation
- As the pollen tube elongates through the style, the generative cell nucleus divides by mitosis, producing 2 sperm.
- The tube nucleus guides the pollen tube toward the micropyle, responding to chemical signals from the synergid cells.
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Description
Explore the fascinating process of pollination and the subsequent growth of pollen tubes. This quiz covers key concepts such as sperm delivery by pollen tubes and the maturation of generative cells. Test your understanding of the roles of different cells in plant reproduction.
