Biology

Biology, 08.10.2019 03:50, jocelynmarquillo1

What causes unequal growth in plant stems allowing them bend toward light?

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Biology, 02.07.2019 17:40, constipatedcow18

What causes unequal growth in plant stems, allowing them to bend toward light

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Biology, 07.07.2019 00:00, jeremiaht7

Valerie designed and conducted an experiment on pothos plants, which are common houseplants. her hypothesis is that the direction of light will affect the growth pattern of a pothos plant. to test the hypothesis, she sets up two test groups of pothos plants and observes them three weeks later. the table summarizes the test groups and observations. test group growth conditions observations 1 light source is only on the side of the plant stems and leaves are bent toward the light 2 light source comes from all directions stems and leaves are not bent what are the roles of the two test groups in this investigation?

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Biology, 26.08.2019 14:30, timothyashburn8

Which of the following can be concluded from the experiment established by the controls above? a. chemicals called hormones are produced in the growing tips of the shoots of plants. b. plants grow toward the sun because of chemicals produced in their stems. c. chemicals produced in shoot tips can cause stems to bend. d. chemicals produced in plant stems stimulate plant growth.

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Biology, 20.11.2019 04:31, khamyah

1. when a horizontally positioned plant responds to gravity, (1 point) auxins in the lower sides of stems cause cell elongation that bends the stem upright. the shoot bends to grow downward, toward the force of gravity. all parts of the plant bend upward, away from the force of gravity. auxins in the shoot cause the growth of tendrils to pull the shoot upwards. 2. the growth of ivy tendrils that wrap around objects is an example of (1 point) gravitropism. phototropism. thigmotropism. photoperiodism. 3. the growth of plant seedlings is usually (1 point) phototropic and gravitropic. thigmotropic and gravitropic. phototropic and influenced by ethylene. gravitropic and influenced by ethylene. 4. the brilliant colors of leaves in the fall are the result of (1 point) new synthesis of orange and yellow pigments in leaves. the movement of chlorophyll from the stems to the leaves. the production of anthocyanin and the breakdown of chlorophyll. the decrease of auxins in the meristems and the increase of phytochrome in the leaves. 5. a commercial flower grower could induce winter flowering of a long-day plant by (1 point) fertilizing the plant with nitrogen. treating the plant with gibberellin. covering the plant with an opaque cloth in the late afternoon. exposing the plant to a brief period of light in the middle of the night.

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