Reaching New Heights: Gibberellins Function

  • 11th Grade
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| Attempts: 19 | Questions: 20 | Updated: Mar 8, 2026
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1. What is the primary role of gibberellins in a developing plant stem?

Explanation

If gibberellins stimulate the cells in the internodes to stretch and multiply, then the result is a significantly taller plant stem.

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About This Quiz
Reaching New Heights: Gibberellins Function - Quiz

This quiz covers gibberellins and their functions in plants, featuring 20 questions designed for students in Grade 11. You will explore key concepts like plant growth, seed germination, and how gibberellins influence these processes. Understanding gibberellins is essential for grasping how plants adapt and thrive in various environments. By completing... see morethis quiz, you will strengthen your knowledge and prepare for advanced studies in plant biology.
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2. Gibberellins are the primary hormones responsible for triggering the germination of a dormant seed.

Explanation

If a seed absorbs water and releases gibberellins, then those hormones signal the breakdown of stored food to start growth; therefore, they are essential for germination.

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3. When a plant like lettuce suddenly grows a very tall flower stalk, it is called "bolting." Which hormone causes this?

Explanation

If environmental cues trigger a massive surge of gibberellins in the stem, then the plant will rapidly elongate its stalk to produce flowers and seeds.

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4. To have the ______ for a biology class, it is important to note that ethylene is a gas, whereas gibberellins are not.

Explanation

If ethylene's chemical structure allows it to exist as a vapor that travels through the air, then it is a gas; since gibberellins travel through the plant's vascular tissue, they are not gases.

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5. Why do grape growers often spray their crops with gibberellins?

Explanation

If gibberellins increase the length of the fruit stalks (pedicels), then the grapes have more room to expand. If they have more room, then the individual grapes grow larger and the cluster is less prone to mold.

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6. The "Bakanae" or "foolish seedling" disease in rice was caused by a fungus that produced too much gibberellin.

Explanation

If the G. fujikuroi fungus infects a rice plant and floods it with gibberellins, then the plant grows so tall and thin that it falls over and dies; this discovery led to the identification of the hormone.

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7. What happens to a "dwarf" variety of a plant if it is treated with a high dose of gibberellins?

Explanation

If many dwarf plants are short because they lack the genes to produce their own gibberellins, then adding the hormone externally will allow the cells to elongate normally.

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8. Which of the following are similarities between the signaling of gibberellins and other plant hormones?

Explanation

If a molecule is a hormone, then it must bind to a receptor and trigger a genetic response. If it works efficiently, then it only requires a tiny amount to travel through the xylem or phloem.

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9. Having the ______ helps us understand that while ethylene causes fruit to soften, gibberellins can delay that process in certain crops.

Explanation

If ethylene is the primary agent of fruit softening and decay, and gibberellins act to maintain tissue firmness, then the two hormones have an antagonistic relationship regarding fruit shelf-life.

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10. What is the "aleurone" layer's role in the gibberellin response?

Explanation

If gibberellins are released by the embryo, then they must travel to a nearby tissue. If the aleurone layer responds by secreting amylase, then it is the "responder" tissue in the germination process.

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11. While having the ______ as a ripening gas, gibberellins are different because they are primarily used to break seed dormancy.

Explanation

If ethylene is a gas used to ripen fruit after harvest, and gibberellins are internal chemicals that wake up a seed, then they serve different stages of the plant life cycle.

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12. Which of the following are known effects of gibberellins on plant development?

Explanation

If gibberellins affect growth and energy release, then they result in larger fruits, rapid stem elongation, and seed activation; however, leaf drop is caused by ethylene and abscisic acid.

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13. How do gibberellins and Abscisic Acid (ABA) act as "opposites" in a seed?

Explanation

If gibberellins act as the "accelerator" for growth and ABA acts as the "brake" to keep the seed dormant, then the ratio between them determines when the seed will sprout.

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14. In the process of having the ______, scientists note that ethylene promotes aging, while gibberellins often promote youthful growth.

Explanation

If ethylene triggers senescence (aging) and fruit ripening, and gibberellins trigger elongation and germination, then their roles in plant maturity are functionally opposite.

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15. Where are gibberellins primarily produced within a plant?

Explanation

If growth hormones are needed where the most active development occurs, then the apical buds, roots, and young leaves are the logical primary sites for gibberellin synthesis.

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16. Even though the ______ involves fruit ripening, gibberellins are actually used to keep some fruits, like citrus, on the tree longer without spoiling.

Explanation

If ethylene signals a fruit to drop and rot, and gibberellins delay that aging process, then farmers use gibberellins to extend the harvest season.

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17. The stored food source inside a seed that is digested when ______ stimulate enzymes is called the endosperm.

Explanation

If the seed contains a large supply of starch (the endosperm), then it needs gibberellins to activate the enzymes that turn that starch into sugar for the growing plant.

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18. Comparing stress responses, how does the ______ differ from the gibberellin response?

Explanation

If a plant is under stress, then it produces ethylene to handle the damage but reduces gibberellins to stop wasting energy on growth. Gibberellins would not be used to speed up growth during a water shortage.

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19. In the beer-making process (brewing), why is gibberellin sometimes added to barley?

Explanation

If malting requires barley seeds to sprout so they release enzymes, then adding gibberellins ensures that all the seeds start germinating at the exact same time and speed.

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20. In a germinating seed, gibberellins signal the aleurone layer to produce the enzyme ______, which breaks down starch into sugar.

Explanation

If the embryo needs energy to grow, then it must digest the starch in the endosperm. If gibberellins trigger alpha-amylase, then that enzyme converts the starch into usable glucose.

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What is the primary role of gibberellins in a developing plant stem?
Gibberellins are the primary hormones responsible for triggering the...
When a plant like lettuce suddenly grows a very tall flower stalk, it...
To have the ______ for a biology class, it is important to note that...
Why do grape growers often spray their crops with gibberellins?
The "Bakanae" or "foolish seedling" disease in rice was caused by a...
What happens to a "dwarf" variety of a plant if it is treated with a...
Which of the following are similarities between the signaling of...
Having the ______ helps us understand that while ethylene causes fruit...
What is the "aleurone" layer's role in the gibberellin response?
While having the ______ as a ripening gas, gibberellins are different...
Which of the following are known effects of gibberellins on plant...
How do gibberellins and Abscisic Acid (ABA) act as "opposites" in a...
In the process of having the ______, scientists note that ethylene...
Where are gibberellins primarily produced within a plant?
Even though the ______ involves fruit ripening, gibberellins are...
The stored food source inside a seed that is digested when ______...
Comparing stress responses, how does the ______ differ from the...
In the beer-making process (brewing), why is gibberellin sometimes...
In a germinating seed, gibberellins signal the aleurone layer to...
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