Plant Physiology Quiz

Which process is most directly affected by a deficiency of magnesium in plants?

• Protein synthesis

• Photosynthesis

• DNA replication

• Transpiration

Which plant hormone is primarily involved in leaf abscission?

• Cytokinin

• Ethylene

• Auxin

• Gibberellin

Which tissue is responsible for water transport in vascular plants?

• Phloem

• Xylem

• Cambium

• Parenchyma

In CAM plants, carbon fixation occurs primarily at what time?

• Midday

• Afternoon

• Night

• Early morning

Which of the following best explains root pressure?

• Capillary action

• Osmosis-driven pressure in roots

• Transpiration pull

• Gravitational pull

What stimulates the opening of stomata during the day?

• Low humidity

• High CO₂ concentration

• Blue light

• Darkness

Which plant hormone delays senescence and is used to preserve cut flowers?

• Ethylene

• Abscisic acid

• Cytokinin

• Auxin

Xylem transports sugars from leaves to roots.

Photoperiodism refers to a plant's response to the duration of light and dark periods.

Stomata close in response to ABA under drought conditions.