AGR022

What is the primary role of CO2 in plants?

• Respiration

• Photosynthesis

• Nutrient transport

• Flowering

Which environmental factor affects both photosynthesis and transpiration?

• Oxygen concentration

• Temperature

• Photoperiod

• Soil porosity

What instrument measures Relative Humidity (RH)?

• Psychrometer

• Hygrometer

• Barometer

• Spectrometer

Which element is crucial for chlorophyll synthesis?

• Magnesium

• Iron

• Sulfur

• Potassium

Deficiency of phosphorus leads to:

• a) Yellowing of lower leaves

• b) Purple leaves and stems

• c) Stunted growth

• Both b and c

Macronutrients required in large amounts include:

• Nitrogen, Sulfur, Calcium

• Chlorine, Iron, Manganese

• Carbon, Hydrogen, Oxygen

• Zinc, Copper, Molybdenum

Which hormone is responsible for breaking seed dormancy?

• Auxin

• Gibberellin

• Ethylene

• Abscisic acid

Cytokinins are used in floristry because they:

• Promote root growth

• Delay aging in cut flowers

• Close stomata

• Induce flowering

Which hormone promotes stomatal closure during water stress?

• Auxin

• Gibberellin

• Abscisic acid

• Ethylene

What is the most important gas for photosynthesis?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen