Plant Adaptations and Responses Quiz

Which of the following is an adaptation that allows cacti to survive in arid environments?

• Large, broad leaves

• Thick, waxy cuticle

• Shallow root system

• High water content in fruits

What is the term for the growth response of a plant toward or away from a stimulus?

• Photoperiodism

• Tropism

• Dormancy

• Germination

Which hormone is primarily responsible for the elongation of plant cells?

• Cytokinin

• Ethylene

• Auxin

• Gibberellin

What type of tropism is demonstrated by a plant's roots growing downward?

• Phototropism

• Gravitropism

• Thigmotropism

• Hydrotropism

Which of the following is an example of a plant response to light?

• Thigmotropism

• Phototropism

• Hydrotropism

• Chemotropism

Which plant hormone is known to promote fruit ripening?

• Auxin

• Cytokinin

• Ethylene

• Abscisic acid

What adaptation helps mangrove trees survive in salty environments?

• Deep taproots

• Salt-excreting leaves

• Thick bark

• Needle-like leaves

Which hormone is involved in the closing of stomata during water stress?

• Gibberellin

• Abscisic acid

• Auxin

• Cytokinin

What is the role of gibberellins in plants?

• Inhibit growth

• Promote seed dormancy

• Stimulate stem elongation

• Induce leaf fall

Which of the following is an example of thigmotropism?

• A sunflower turning towards the sun

• A vine wrapping around a trellis

• Roots growing towards water

• Leaves closing at night