CHAPTER 8 QUIZ LOVELIES SB025

What is the pressure flow hypothesis?

• Phloem sap moves via bulk flow due to pressure differences

• Phloem sap moves through osmosis and diffusion

• Phloem sap is transported by active transport mechanisms

• Phloem sap is absorbed by root hairs and transported upwards

Which heart valves prevent backflow of blood into atria?

• Atrioventricular (AV) valves (Bicuspid and Tricuspid)

• Semilunar valves (Aortic and Pulmonary)

• Pulmonary veins

• Coronary valves

Where is the SA node located?

• Upper wall of the right atrium

• Lower wall of the left atrium

• Interventricular septum

• Base of the heart

What is the duration of one complete cardiac cycle?

• 0.5 seconds

• 0.8 seconds

• 1.2 seconds

• 1.0 seconds

What is transpiration pull?

• A process where roots absorb water from the soil

• Water loss from leaves creates negative pressure, pulling water up

• The movement of nutrients from the soil to the leaves

• A method of photosynthesis in plants

What is the symplastic pathway?

• Water moves through cytoplasm via plasmodesmata

• Water moves through cell walls only

• Water is absorbed directly by root hairs

• Water travels through xylem vessels

How do hydrogen bonds aid water transport?

• Cohesion keeps water molecules linked, preventing breakage

• Hydrogen bonds increase the temperature of water

• Hydrogen bonds allow water to evaporate quickly

• Cohesion reduces the density of water

What is the first sound (‘lub’) in the heartbeat caused by?

• Closing of AV valves during ventricular systole

• Opening of semilunar valves

• Contraction of atria

• Relaxation of ventricles

What is the apoplastic pathway?

• Water moves through cell walls and intercellular spaces

• Water moves through the cytoplasm of cells

• Water is absorbed directly by root hairs

• Water travels through xylem vessels only

What is a sugar sink?

• Organ that produces sugars (e.g., leaves)

• Organ that consumes or stores sugars (e.g., roots, fruits)

• Organ that transports sugars (e.g., phloem)

• Organ that breaks down sugars (e.g., stems)