Biology Quiz Chapter 21

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Quizzes Created: 2 | Total Attempts: 210

Questions: 5 | Attempts: 77 | Updated: Oct 4, 2023

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This Biology Quiz Chapter 21 focuses on key aspects of plant biology, specifically plant hormones. It assesses knowledge on types, functions, and effects of hormones like Auxin and its role in plant growth mechanisms such as phototropism and apical dominance.

Questions and Answers

1.

Name the 5 major plant hormones, in alphabetical order
- A.
  
  Abscisic acid, Auxins, Cytokinins, Ethylene, Gibberellins
- B.
  
  Abscisic acid, Auxins, Cytokinins, Ethylene, and Gibberellins
Correct Answer(s)
A. Abscisic acid, Auxins, Cytokinins, Ethylene, Gibberellins
B. Abscisic acid, Auxins, Cytokinins, Ethylene, and Gibberellins

Explanation
The correct answer is Abscisic acid, Auxins, Cytokinins, Ethylene, and Gibberellins. This answer lists the 5 major plant hormones in alphabetical order, providing a comprehensive and accurate response to the question.

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2.

What is the most naturally occuring auxin called?

Correct Answer(s)
indoleacetic acid

Explanation
Indoleacetic acid is the most naturally occurring auxin. Auxins are a group of plant hormones that regulate various aspects of plant growth and development. Indoleacetic acid is produced in the tips of plant shoots and promotes cell elongation, root development, and fruit growth. It plays a crucial role in phototropism, geotropism, and apical dominance. Indoleacetic acid is synthesized from the amino acid tryptophan and is transported throughout the plant to regulate various physiological processes.

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3.

How is the most naturally occuring auxin produced and where is it found?

Correct Answer(s)
in the shoot meristem and is found in young leaves and in flowers and fruits
in the shoot meristem and it is found in young leaves and in flowers and fruits
in the shoot meristem and is found in young leaves, flowers and fruits

Explanation
The correct answer is "in the shoot meristem and is found in young leaves and in flowers and fruits." This answer specifies that the most naturally occurring auxin is produced in the shoot meristem and can be found in young leaves, flowers, and fruits.

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4.

What is Auxin Involved in that helps it in plant growth?

Correct Answer(s)
Phototropism

Explanation
Auxin is a plant hormone that plays a crucial role in phototropism. Phototropism is the growth or movement of a plant in response to light. Auxin helps in this process by redistributing itself in response to light, causing the plant to bend towards the light source. This hormone is responsible for elongating cells on the shaded side of the plant, causing it to grow towards the light and optimize its exposure to sunlight for photosynthesis. Therefore, auxin is involved in phototropism and helps in plant growth by facilitating light perception and directional growth.

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5.

Influence of a terminal bud in suppressing the growth of lateral buds

Correct Answer(s)
apical dominance

Explanation
Apical dominance refers to the phenomenon where the terminal bud of a plant inhibits the growth of lateral buds. The terminal bud releases a hormone called auxin, which travels downwards and suppresses the growth of lateral buds. This allows the plant to focus its energy on growing upwards, promoting vertical growth. By inhibiting the growth of lateral buds, apical dominance helps maintain the plant's shape and directs its growth towards the top.

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