Pollen grains in pinus have __________ for dispersal through wind?
Correct answer: C. Wings
- A. Flagella
- B. Cilia
- C. Wings
- D. Feathers
Explanation
Pinus pollen grains possess air sacs or wings that increase surface area and allow them to be carried efficiently by wind. Students may choose flagella because these structures aid movement in some cells, but wind-dispersed pollen is non-motile.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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