Quiz on Stress Physiology and Salinity in Plants

What is the primary ion that interferes with potassium uptake in plants under salinity stress?

• Mg²⁺

• Cl⁻

• Na⁺

• Ca²⁺

What is the first phase of the growth response to salinity stress called?

• Dehydration stress

• Nutrient imbalance

• Salt-specific stress

• Osmotic stress

Which hormone is primarily responsible for stomatal closure during salinity stress?

• Auxin

• Ethylene

• Abscisic acid (ABA)

• Cytokinins

What is the role of GIPC sphingolipids in plants under salinity stress?

• Facilitate root growth

• Act as Na⁺ sensors

• Enhance chlorophyll production

• Promote K⁺ uptake

Which of the following is a common source of salinity in agricultural soils?

• Mulch

• Organic compost

• Chemical fertilizers

• Rainwater

What is the effect of high salinity on water uptake by plants?

• Increases nutrient absorption

• Has no effect

• Reduces water uptake

• Increases water uptake

Which plant is an example of a halophyte that can tolerate high salinity?

• Zea mays

• Avicennia marina

• Glycine max

• Oryza sativa

Which of the following ions is essential for regulating turgor pressure in plants?

• Ca²⁺

• Na⁺

• Cl⁻

• K⁺

What adaptation do mangrove plants use to excrete excess salt?

• Root exudation

• Salt glands on leaves

• Deep root systems

• Leaf shedding

What is the role of reactive oxygen species (ROS) in salinity stress response?

• Promote growth

• Enhance photosynthesis

• Activate defence mechanisms

• Increase nutrient uptake