External stimuli would be received most quickly by a plant cell if the receptors for signal transduction were located in the 1. plasma membrane
2. cytoplasmic matrix. 3. endoplasmic reticulum
4. nuclear membrane
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Subtopic: Â Growth Terminology |Â Development |
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A:
In some plants flowering is either quantitatively or qualitatively dependent on
exposure to low temperature. R:
Low temperature treatment shortens vegetative phase in some plants In the following questions a statement of assertion (A) is followed by a statement
of reason (R). 1. If both Assertion & Reason are true and the reason
is the correct explanation of the assertion, then mark (1) 2. If both Assertion
& Reason are true but the reason is not the correct explanation of the assertion,
then mark (2) 3. If Assertion is true statement but Reason is false, then
mark (3) 4. If both Assertion and Reason are false statements, then mark
(4)
If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false
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Plants growing in a partially dark environment will grow toward light in a response called phototropism. Which of the following statements is true regarding phototropism? 1. It is caused by an electrical signal. 2. One chemical involved is ethylene. 3. Auxin causes a growth increase on one side of the stem. 4. Auxin causes a decrease in growth on the side of the stem exposed to light.
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Subtopic: Â Growth Hormones & Auxin |
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Which of the following statements applies to plant growth regulators? 1. They only act by altering gene expression 2. They often have a multiplicity of effects 3. They function independently of other hormones. 4. They directly control plant protein synthesis and assembly.
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Subtopic: Â Growth Hormones & Auxin |
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According to modern ideas about phototropism in plants,
1. light causes auxin to accumulate on the shaded side of a plant stem.
2. auxin indirectly inhibits elongation of plant stem cells
3. auxin is produced by the apical meristem of the coleoptile and moves downward.
4. all hormones move downward via the xylem.
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Subtopic: Â Growth Hormones & Auxin |
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