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Questions and Answers
What is the purpose of sporo-pollenin in pollen grains?
What is the purpose of sporo-pollenin in pollen grains?
- To provide nutrients to the pollen
- To protect the pollen during transport (correct)
- To attract pollinators
- To help the pollen germinate
Which type of plants have free-living gametophytes that release flagellated sperm?
Which type of plants have free-living gametophytes that release flagellated sperm?
- Angiosperms
- Seed plants
- Nonvascular plants (correct)
- Seedless vascular plants
What is the advantage of seed plants being able to transfer sperm without water?
What is the advantage of seed plants being able to transfer sperm without water?
- They can attract more pollinators
- They can produce more seeds
- They can grow taller
- They can colonize dry habitats (correct)
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Study Notes
- Microspores develop into pollen grains with male gametophytes.
- Pollen grains have walls made of sporo-pollenin for protection during transport.
- Pollination is the transfer of pollen to the ovules of a seed plant.
- Pollen grains germinate and form a pollen tube to deliver sperm to the female gametophyte.
- Nonvascular and seedless vascular plants have free-living gametophytes that release flagellated sperm.
- Seed plants can transfer sperm without water, allowing them to colonize dry habitats.
- Sperm of seed plants do not require motility as they are carried by pollen tubes.
- Some gymnosperm species have flagellated sperm, but most gymnosperms and all angiosperms do not.
- The loss of flagella in sperm likely contributed to the success of seed plants.
- Many nonvascular and seedless vascular plants live in moist habitats due to their dependence on water for sperm transport.
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