Biology Unit-7 Test

Root hair are the extensions of:

• Pericycle

• Epidermis

• Pith

• Parenchyma

Which of the following pathway of water conduction is interrupted by endodermis?

• Vacuolar pathway

• Symplast pathway

• Apoplast pathway

• All A, B, C

It separates extracellular space in root into two compartments:

• Cortex

• Plasmodesmata

• Pericycle

• Casparian strips

It is the main factor that is involved in uptake of water to aerial parts of plants:

• Cohesion

• Transpiration pull

• Imbibition

• Root pressure

If a plant absorbs 10 liters of water per day, then what will be the amount of water used by the plant for its metabolism?

• 0.1 liter

• 5 liters

• 1 liter  

• 9 liters

In plants, facilitated diffusion helps in the transport of minerals across the cell membrane by using:

• Phospholipids

• Membrane proteins

• Cholesterol molecules

• Membrane carbohydrates

It is the attraction among water molecules which holds them together within the xylem tube:

• Tension

• Adhesion

• Cohesion

• Imbibition

Stomata open due to __________of K⁺ into guard cell.

• Diffusion

• Active transport

• Facilitated diffusion 

• Osmosis

The hormone which reduces the rate of transpiration by stopping K⁺ influx into the guard cells:

• Auxins

• Cytokinins

• Gibberellins

• Abscisic acid

All environmental factors are sensed by guard cell except:

• Temperature

• Light intensity

• Nitrogen in air

• Relative humidity