The Fountain of Youth: Cytokinins in Plants

  • Grade 11th
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| Attempts: 11 | Questions: 20 | Updated: Mar 9, 2026
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1. Which enzyme's activity is often inhibited by cytokinins to help prevent the breakdown of chlorophyll?

Explanation

If chlorophyllase is the enzyme responsible for destroying green pigment during aging, and if cytokinins keep leaves green, then the hormone must block or reduce the activity of chlorophyllase.

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About This Quiz
The Fountain Of Youth: Cytokinins In Plants - Quiz

This quiz features 20 questions about cytokinins in plants, designed for students in Grade 11. You'll explore how these plant hormones influence growth, cell division, and the aging process in plants. Understanding cytokinins is key to grasping how plants adapt to their environment and thrive. By taking this quiz, you�ll... see moredeepen your knowledge of plant biology and enhance your ability to connect these concepts to real-world applications in agriculture and ecology. Dive in and see how well you know the role of cytokinins in promoting healthier, more vibrant plant life!
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2. Finalizing the logic of cytokinins in plants: If auxins promote "elongation," then cytokinins primarily promote ______.

Explanation

If elongation means making existing cells longer, then proliferation means making more cells through division. If cytokinins trigger cytokinesis, then their primary contribution to growth is cell proliferation.

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3. Some bacteria and fungi can produce cytokinins to manipulate the growth of the host plant.

Explanation

If a pathogen wants to create a "nutrient sink" to feed itself, then it can secrete cytokinins into the plant tissue. If the tissue grows into a tumor or remains unnaturally green (green islands), then the pathogen has successfully hijacked the plant's hormones.

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4. In what ways do cytokinins in plants interact with the environment?

Explanation

If cytokinins are involved in general cell health and light signaling, then they help the plant adjust its pores and growth to the sun and fight off infections; however, they do not manage root gravity or soil sugar.

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5. What is the likely result of a mutation that prevents a plant from producing any cytokinins?

Explanation

If cytokinins are required for the cell division that builds the stem and leaves, then a total lack of the hormone will stop growth. If growth stops at the tips, then the plant remains a dwarf or dies.

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6. The movement of ______ through the plant is considered "acropetal," meaning it moves from the base toward the apex.

Explanation

If a hormone is carried in the xylem from the roots up to the leaves, then its direction of travel is acropetal (upward).

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7. Cytokinins in plants primarily regulate the G2 to M-phase transition of the cell cycle.

Explanation

If cell division requires specific checkpoints to be passed, then hormones must act on the molecular machinery of those checkpoints. If cytokinins trigger the start of mitosis, then they act on the transition to the M-phase.

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8. Why do florists sometimes spray cut flowers with a solution containing cytokinins in plants?

Explanation

If cytokinins prevent the degradation of proteins and chlorophyll, then they stop the "death" signal in harvested plants. If death is delayed, then the flowers remain fresh and colorful for the customer longer.

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9. Which of the following describe the chemical structure of most cytokinins in plants?

Explanation

If cytokinins are modified versions of the DNA base adenine, then they are nitrogen-heavy rings with specific side chains; they are not fats or gases like ethylene.

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10. If a mass of undifferentiated plant cells, called a ______, is treated with equal parts auxin and cytokinin, it will continue to divide without forming organs.

Explanation

If the hormone signals for roots and shoots are perfectly balanced, then the cells receive the "divide" instruction but no "specialize" instruction. If they remain unspecialized, then the mass is called a callus.

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11. What is the primary cellular process stimulated by the presence of cytokinins?

Explanation

If "cytokinesis" refers to the physical division of a cell's cytoplasm into two daughter cells, then the hormone named after this process must be its primary stimulator.

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12. The effect of cytokinins in plants is often dependent on the presence and concentration of auxins.

Explanation

If these two hormones work together to control the cell cycle and organ development, then the absolute amount of one matters less than the relative ratio between both.

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13. Which of the following are recognized physiological effects of cytokinins in plants?

Explanation

If cytokinins maintain tissue youth, then they delay aging and help chloroplasts develop. If they oppose the main tip's control, then they help side buds grow; however, they do not ripen fruit or stop division.

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14. In the context of cytokinins in plants, what is "nutrient mobilization"?

Explanation

If a leaf has a high concentration of cytokinins, then it acts as a "sink" that draws nutrients from other parts of the plant. If it pulls these resources to itself, then it can stay healthy even when the rest of the plant is stressed.

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15. The first naturally occurring cytokinin to be identified and isolated from corn is known as ______.

Explanation

If researchers found a specific chemical in "Zea mays" (corn) that stimulated cell division, then they named that compound Zeatin.

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16. One way that cytokinins in plants affect growth is by antagonizing apical dominance to promote lateral bud growth.

Explanation

If apical dominance (caused by auxin) keeps side branches from growing, then an opposing hormone is needed to break that control. If cytokinins stimulate axillary buds, then they are the antagonist to auxin in this process.

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17. When scientists use tissue culture to grow new plants, what occurs when the ratio of cytokinins to auxins is very high?

Explanation

If auxin promotes root formation and cytokinins in plants promote shoot formation, then a high cytokinin-to-auxin ratio will specifically trigger the development of stems and leaves.

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18. How do cytokinins in plants typically travel from the roots to the rest of the organism?

Explanation

If these hormones are produced in the roots and must reach the leaves and stems, then they must use the plant's plumbing. If they follow the upward flow of water and minerals, then they travel through the xylem.

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19. While auxins are mostly produced in the shoot tips, the majority of ______ are produced in the actively growing roots.

Explanation

If a plant needs to signal the shoots about root health and growth, then it produces hormones in the roots to travel upward.

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20. The primary role of cytokinins in plants is to accelerate the process of leaf senescence (aging).

Explanation

If senescence is the biological process of aging and tissue death, and if cytokinins are known to keep leaves green and functional for longer, then they delay senescence rather than accelerate it.

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Which enzyme's activity is often inhibited by cytokinins to help...
Finalizing the logic of cytokinins in plants: If auxins promote...
Some bacteria and fungi can produce cytokinins to manipulate the...
In what ways do cytokinins in plants interact with the environment?
What is the likely result of a mutation that prevents a plant from...
The movement of ______ through the plant is considered "acropetal,"...
Cytokinins in plants primarily regulate the G2 to M-phase transition...
Why do florists sometimes spray cut flowers with a solution containing...
Which of the following describe the chemical structure of most...
If a mass of undifferentiated plant cells, called a ______, is treated...
What is the primary cellular process stimulated by the presence of...
The effect of cytokinins in plants is often dependent on the presence...
Which of the following are recognized physiological effects of...
In the context of cytokinins in plants, what is "nutrient...
The first naturally occurring cytokinin to be identified and isolated...
One way that cytokinins in plants affect growth is by antagonizing...
When scientists use tissue culture to grow new plants, what occurs...
How do cytokinins in plants typically travel from the roots to the...
While auxins are mostly produced in the shoot tips, the majority of...
The primary role of cytokinins in plants is to accelerate the process...
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