WorksheetsSYI Plant hormones
Total questions: 27
Worksheet time: 14mins
Plants produce plant hormones called auxins to coordinate and control growth. Which of the following is a function of auxins in shoots?
Promote cell elongation
Inhibit cell elongation
Promote cell division
Inhibit cell division
In plants, what is the result of a positive phototropic response in shoots?
Shoots grow upwards towards light
Shoots grow downwards away from light
Roots grow upwards towards light
Roots grow downwards away from light
In gravitropism or geotropism, how do shoots respond to gravity?
Positive gravitropic response
Negative gravitropic response
Positive phototropic response
Negative phototropic response
How do roots respond to light?
Positive phototropic response
Negative phototropic response
Positive gravitropic response
Negative gravitropic response
What is the primary effect of auxins in the roots?
Promote cell elongation
Inhibit cell elongation
Promote cell division
Inhibit cell division
How is the distribution of auxin in shoots affected?
Primarily by gravity
Primarily by light
By both light and gravity
Neither light nor gravity
What happens when a shoot or root is placed on its side?
Auxins accumulate along the upper side
Auxins accumulate along the lower side
Auxins are distributed evenly
Auxins are not affected
Which side of the shoot grows faster due to auxin in gravitropism?
Upper side
Lower side
Both sides equally
Neither side
In which part of the shoot is auxin mostly made?
Middle of the shoot
Base of the shoot
Tips of the growing shoots
Throughout the shoot
How does auxin affect the cells behind the tip of the shoot?
Stimulates to inhibit cell elongation
Stimulates to promote cell elongation
Inhibits to promote cell elongation
Inhibits to inhibit cell elongation
If light shines predominantly from one side on a shoot, where does auxin concentrate?
Sunny side
Shaded side
Both sides equally
No concentration occurs
Unequal distribution of auxin causes what in plant roots and shoots?
Equal growth rates
Unequal growth rates
No growth
Stunted growth
What happens to the shoot when auxin accumulates on the shaded side due to light?
Shoot grows towards the light
Shoot grows away from the light
Shoot stops growing
Shoot grows uniformly
The region behind the tip of a shoot contributes to growth primarily by what process?
Cell division
Cell elongation
Both cell division and elongation
Neither cell division nor elongation
When light shines all around the tip of a shoot, how is auxin distributed?
Concentrated on the shaded side
Concentrated on the sunny side
Distributed evenly throughout
No distribution occurs
What is the primary factor affecting the distribution of auxin in the roots?
Light
Gravity
Temperature
Humidity
What is the result of a negative gravitropic response in plant roots?
Roots grow upwards
Roots grow downwards
Shoots grow upwards
Shoots grow downwards
What role do gibberellins play in seed germination?
Inhibit seed germination
Have no effect on seed germination
Promote seed germination
Delay seed germination
Which hormone is released by plants and controls cell division and fruit ripening?
Auxins
Gibberellins
Ethene
Cytokinins
How are auxins used in the food industry?
To control fruit ripening
To control seed germination
As selective weedkillers
To increase fruit size
What is the main role of ethene in the food industry?
Promote seed germination
Control ripening of fruits during storage and transport
Inhibit flowering
Promote flowering
What can be achieved by taking cuttings of a desirable plant and dipping the tips in auxins?
Promoting flowering
Promoting seed germination
Encouraging the rapid development of roots
Inhibiting root growth
Which hormone can be used to end seed dormancy and promote germination?
Ethene
Auxins
Gibberellins
Cytokinins
What is the effect of gibberellins on flowering?
Delays flowering
Promotes flowering regardless of weather conditions
Inhibits flowering
No effect on flowering
In the food industry, why is it preferable to transport unripe fruit?
Ripe fruit is firmer
Ripe fruit is softer and more easily damaged
Unripe fruit has a longer shelf life
Unripe fruit is heavier
What is the primary use of gibberellins in fruit production?
To control fruit ripening
To promote seed germination
To increase fruit size
To inhibit fruit growth
How are gibberellins used to increase fruit size?
By increasing the number of seeds
By promoting seed germination
By inhibiting fruit growth
By promoting the development and growth of fruit
