Which direction do roots of a plant typically grow in response to light?
Show answer & explanation
Correct answer: B
Explanation
Correct Answer:
Option 2 (Away from Light)
Explanation:
Plant roots typically exhibit negative phototropism, meaning they grow away from the light source. In contrast, plant stems exhibit positive phototropism and grow toward light. Roots primarily grow downward in the direction of gravity, which is called positive geotropism.
Additional Facts:
Auxin hormone: This hormone regulates the response to light in roots and stems. In roots, high concentrations of auxin inhibit growth, causing them to bend away from light.
Geotropism: Roots always grow downward in the direction of gravity, which helps them absorb water and minerals from the soil.
Hydrotropism: In addition to light, roots are also attracted to the presence of water.
Possible questions for upcoming exams:
Which part of a plant exhibits positive phototropism?
(Answer: Stem/Shoot)
What is the tendency of roots to grow downward called?
(Answer: Positive geotropism)
What is the main hormone responsible for plant growth?
(Answer: Auxin)