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BIO 106 EXAM 2

Terms in this set (22)

Photosynthesis ceases when leaves wilt, mainly because _____.
stomata close, preventing carbon dioxide from entering the leaf
Most of the dry mass of a plant is the result of uptake of _____.
carbon dioxide through stomata
Which of the following seedlings will probably bend toward light?
-one whose tip is separated from its base by a gelatin block
-one whose tip is cut off and topped by a gelatin block containing no plant substances
-one whose tip is cut off
-one whose tip is covered with a black plastic cap
-one whose tip is separated from its base by aluminum foil
-one whose tip is separated from its base by a gelatin block
The relationship between legumes and Rhizobium is _____.
mutualistic
Stomata density is _______.
developmentally plastic
Loss of water from aerial parts of plants is called ____.
transpiration
Leaf thickness represents a trade-off between _____.
water retention and carbon dioxide absorption
Phloem transport is described as being from source to sink. Which of the following would most accurately complete this statement about phloem transport as applied to most plants in the late spring?
Phloem transports ________ from the ________ source to the ________ sink.
sugar; leaf; apical meristem
How are the bryophytes and seedless vascular plants alike?
Both have sperm that swim from antheridia to archegonia.
When you look at a pine or maple tree, the plant you see is a _____.
diploid sporophyte
As a youngster, you drive a nail in the trunk of a young tree that is 3 meters tall. The nail is about 1.5 meters from the ground. Fifteen years later, you return and discover that the tree has grown to a height of 30 meters. About how many meters above the ground is the nail?
1.5
Which of the following can be sensed by plants?
I) gravity
II) pathogens
III) wind
IV) light
All
Plant hormones act by directly affecting the activities of _____.
signal transduction pathways
The sundew plant has to digest insects because _____.
it lacks nitrogen
In lettuce seeds, blue light initiates germination. If you measured hormone levels within the seed, which hormone would be produced upon exposure to blue light?
gibberelin
The movement of water across biological membranes can best be predicted by _____.
water potentials
Cellular differentiation and morphogenesis in plants depends primarily on _____.
regulation of gene expression
The major difference between angiosperms and gymnosperms comes from the _____.
angiosperms have a protected covering on their ovule while gymnosperms do not
Which part of a plant absorbs most of the water and minerals taken up from the soil?
root hairs
How is fertilization in flowering plants different from fertilization in other plant groups?
One sperm fuses with the egg, while the other sperm fuses with two polar nuclei to form the endosperm
What term best describes the male gametophytes of flowering plants?
pollen grains
Double fertilization makes endosperm a ______.
triploid
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