Difference between revisions of "AY Honors/Grasses/Answer Key"
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The '''[[W:Poaceae|Poaceae]]''' is also known as the '''[[W:Gramineae|Gramineae]]'''. There are about 600 genera and between 9,000 to 10,000 species of these plants. Plant communities dominated by Poaceae are called grasslands; it is estimated that grasslands comprise 20% of the vegetation cover of the earth. This family is the most important of all plant families to human economies: it includes the staple food grains grown around the world, lawn and forage grasses, and bamboo, widely used for construction throughout Asia. | The '''[[W:Poaceae|Poaceae]]''' is also known as the '''[[W:Gramineae|Gramineae]]'''. There are about 600 genera and between 9,000 to 10,000 species of these plants. Plant communities dominated by Poaceae are called grasslands; it is estimated that grasslands comprise 20% of the vegetation cover of the earth. This family is the most important of all plant families to human economies: it includes the staple food grains grown around the world, lawn and forage grasses, and bamboo, widely used for construction throughout Asia. | ||
| − | ==4. Do the seeds of grasses have two halves as does the bean (a dicotyledon), or does the seed consist of just one part as do the lily, date, and coconut (monocotyledons)?== | + | ==4. Do the seeds of grasses have two halves as does the bean (a dicotyledon), or does the seed consist of just one part as do the lily, date, and coconut (monocotyledons)?== |
| + | All grasses are monocotyledons, so the seeds have only one part. | ||
| + | |||
==5. What unique characteristic in the growth of grass leaves makes it possible for the plant to flourish even though continually mowed or grazed?== | ==5. What unique characteristic in the growth of grass leaves makes it possible for the plant to flourish even though continually mowed or grazed?== | ||
==6. Name three annual grasses, that is, grasses that sprout from seeds, blossom, bear seeds, and then die the same summer.== | ==6. Name three annual grasses, that is, grasses that sprout from seeds, blossom, bear seeds, and then die the same summer.== | ||
Revision as of 03:34, 24 November 2007
1. What characteristics must a plant have to qualify as a grass?
2. What kind of roots do all grasses have?
3. About how many species around the world are there in the grass family called Gramineae or Poaceae?
The Poaceae is also known as the Gramineae. There are about 600 genera and between 9,000 to 10,000 species of these plants. Plant communities dominated by Poaceae are called grasslands; it is estimated that grasslands comprise 20% of the vegetation cover of the earth. This family is the most important of all plant families to human economies: it includes the staple food grains grown around the world, lawn and forage grasses, and bamboo, widely used for construction throughout Asia.
4. Do the seeds of grasses have two halves as does the bean (a dicotyledon), or does the seed consist of just one part as do the lily, date, and coconut (monocotyledons)?
All grasses are monocotyledons, so the seeds have only one part.
