Plant Responses to Stimuli
Biology ⇒ Plant Biology
Plant Responses to Stimuli starts at 8 and continues till grade 12.
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See sample questions for grade 9
A plant is placed in a dark room with a single window. After a week, the plant bends towards the window. What type of response is this?
A student places a potted plant on its side. After a few days, the stem bends upward. What type of response is this?
A Venus flytrap snaps shut when an insect touches its hairs. Is this a tropic or nastic movement?
Describe how auxin distribution causes a plant stem to bend towards light.
A plant is placed in a dark room with a single window. After a week, the plant bends towards the window. What type of response is this?
A student places a potted plant on its side. After a few days, the stem bends upward. What type of response is this?
A Venus flytrap snaps shut when an insect touches its hairs. Is this a tropic or nastic movement?
A scientist places two identical plants in separate rooms. In Room A, the plant is exposed to constant light, while in Room B, the plant experiences 12 hours of light followed by 12 hours of darkness each day. After two weeks, the plant in Room B begins to flower, but the plant in Room A does not. Explain the biological mechanism behind this difference in flowering.
Which hormone is known as the 'stress hormone' in plants? (1) Auxin (2) Gibberellin (3) Abscisic acid (4) Cytokinin
Which hormone is primarily involved in the ripening of fruits? (1) Auxin (2) Gibberellin (3) Ethylene (4) Abscisic acid
Which hormone is responsible for promoting lateral bud growth? (1) Auxin (2) Cytokinin (3) Gibberellin (4) Ethylene
Which of the following is a correct match? (1) Phototropism - response to water (2) Geotropism - response to gravity (3) Thigmotropism - response to light (4) Hydrotropism - response to touch
Fill in the blank: The closing of Mimosa pudica leaves when touched is an example of __________ movement.
Fill in the blank: The growth of roots towards water is called __________.
Fill in the blank: The hormone __________ inhibits the growth of lateral buds, a phenomenon known as apical dominance.
Fill in the blank: The hormone __________ is responsible for fruit ripening and leaf abscission.
True or False: Abscisic acid promotes seed dormancy.
True or False: All plant hormones promote growth.
True or False: All plant movements are growth movements.
True or False: Chemotropism is the movement of a plant in response to chemicals.
