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WorksheetsTropic Responses
Total questions: 34
Worksheet time: 18mins
Which type of tropism is represented in the GIF?
Hydrotropism
Thigmotropism
Phototropism
Geotropism
Which type of tropism is represented in the photograph?
Hydrotropism
Thigmotropism
Phototropism
Geotropism
Which of the following is true of a tropic response?
a growth response.
produced by certain part of a plant.
a response to a unidirectional stimulus.
a slow response.
Phototropic response
is a response to uniform light.
is positive in root tip.
is negative in shoot tip.
allows the maximum absorption of light by leaves.
By comparing the results of experiments 1, 2 and 3, what conclusion can you make?
The shoot is positively phototropic.
The shoot tip is the receptor of unidirectional light.
The region just below the shoot tip is the receptor of unilateral light.
None of them listed.
The shoot tip was cut and placed back on the left side of the shoot. The shoot was then bend towards the right in complete darkness. What deduction(s) could you made?
Left side of the shoot (with the shoot tip) has a higher concentration of a chemical which causes faster elongation growth just below.
Left side of the shoot grew faster than the right side which causes the bending of the shoot towards the right
The signal which causes bending of the shoot is an electrical one.
If uniform light is provided to the shoot,
Auxins diffuse evenly from the shoot tip to the region of elongation below on both the left and right sides of the shoot.
The same concentration of auxins causes the same elongation growth as observed on both left and right sides of the shoot.
The left and right sides of the shoot grow evenly and there is a uniform elongation of the shoot.
If light is illuminated from one side,
it causes lateral diffusion of auxins from the lit/illuminated side to the shaded/unilluminated side of the shoot.
a higher concentration of auxins at the shaded side of the shoot stimulates faster elongation growth.
a lower concentration of auxins at the lit side of the shoot causes slower elongation growth.
The lit and shaded sides of the shoot elongate differently and cause the growth of the shoot towards the light.
What is gravitropism?
Response to water
Response to touch
Response to gravity
Response to light
A plant's directional growth in response to external stimuli is called ________.
Tropism
Taxis
Turgor Pressure
Homeostasis
Plants can detect gravity and respond to it. How do the roots respond to gravity?
The roots grow away from gravity
The roots grow towards gravity
The roots do not detect this stimulus
Plants can detect light and respond to it. How do the shoots respond to light?
They do not respond to this stimulus
They grow towards the light
They grow away from light
Plants can detect light and respond to it. How do the roots respond to light?
The roots do not respond to this stimulus
The roots grow toward the light
The roots grow away from light
This picture would represent which type of tropism?
Phototropism
Gravitropism
Hydrotropism
Thigmotropism
When a plant grows towards the stimuli the response is
Positive
Negative
A stimulus is ___________
a change in an organisms surroundings.
process in which organisms grow larger.
a reaction to a change in surroundings
tropism
Substances that act as chemical messengers within plants, controlling functions are called
Chemicals
Plant Hormones
Adrenaline
Photosynthesis
Which substance coordinates phototropisms and geotropisms in plants?
Chlorophyll
Phloem
Auxin
Axon
Where in a plant can auxin be made? Choose all correct answers.
Shoot tip
Shaded side of shoot
Root tip
Upper side of root
What effect does auxin have on root cells?
Inhibits division
Inhibits elongation
Promotes elongation
Promotes cell division
What effect does auxin have on shoot cells?
Inhibits elongation
Inhibits cell division
Promotes cell division
Promotes elongation
Where will auxin accumulate in shoot tissue that is exposed to light form one side?
Equally in all cells
On the shaded side
On the side exposed to light
in the tip
What is the advantage of phototropism?
A plant gets light for photosynthesis
A plant grows straigher
A plant can germinate faster
A plant has stronger roots
Which sentence best describes the picture
Auxin diffuses through the shoot
Auxin accumulates on the shaded side of the shoot
Auxin on the brightest side of the shoot is broken down
Auxin is released on the shaded side of the shoot
Auxin makes cells grow .....
bigger
longer
shorter
smaller
Plants showing phototropism bend towards the light because the shaded side is .......
shorter
longer
different
just the same
Billy orders a plant for his garden. When it was delivered, the roots and the plant stem were not growing straight out of the clay pot. Instead, the direction of their growth was in a 'sideways' direction. The diagram shows the direction the plant was growing when it was received by Billy.
Why is the most likely reason for the direction of the plant growth?
The plant lost turgor pressure and changed it's growth direction.
The plant was laid on its side inside the package and gravitropism caused the plant to change its growth direction.
The plant found light through the sealed package and phototropism caused the plant to change it's direction of growth.
Plants normally grow in strange patterns until they reach a certain age.
The diagram illustrates a seed germinating. Many forces, including responses to moisture, temperature, and gravity are at work in this process. Which part of the seedling is demonstrating a negative response to gravity and which is showing a positive response to gravity?
iv is negative and III is positive.
IV is negative and II is positive.
II is negative and III is positive.
III is negative and IV is positive.
If the top portion of plants grow "up," explain why a small tree on a hillside does not grow straight out from the hillside?
The tree is growing toward water.
The tree is resting on the hillside.
The tree is leaning toward the top of the hill so rain won't wash it off.
The tree's roots and trunk are growing in response to gravity.
Trees that grow in a forest tend to grow very tall, with few branches. The same species of tree grown in an open area tends to grow shorter and wider, with many branches. The stimulus responsible for these different growth patterns is the amount of —
wind striking the tree
light reaching the tree
nutrients in the soil
water in the ground
