CHAPTER 8 QUIZ LOVELIES SB025

What is a sugar source?

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

• Organ that stores fats (e.g., adipose tissue)

• Organ that absorbs water (e.g., roots)

• Organ that transports nutrients (e.g., stems)

Which heart valves prevent backflow of blood into atria?

• Atrioventricular (AV) valves (Bicuspid and Tricuspid)

• Semilunar valves

• Pulmonary valves

• Aortic valves

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

• Closing of AV valves during ventricular systole

• Opening of semilunar valves

• Closing of semilunar valves during diastole

• Opening of AV valves during systole

What causes transpirational pull?

• Evaporation of water from mesophyll cells

• Absorption of nutrients by roots

• Photosynthesis in chloroplasts

• Translocation of sugars in phloem

What are the three pathways for water movement in plant roots?

• Apoplastic, symplastic, transmembrane routes

• Xerophytic, hydrophytic, mesophytic pathways

• Cohesive, adhesive, capillary actions

• Osmotic, diffusion, active transport methods

Why do sieve tube elements lack nuclei?

• To allow efficient transport of phloem sap

• To increase the surface area for photosynthesis

• To store more nutrients

• To enhance cell division

How do guard cells regulate transpiration?

• By opening and closing stomata

• By absorbing water from the soil

• By releasing oxygen into the atmosphere

• By increasing photosynthesis rate

What happens at the sugar sink?

• Sucrose is unloaded and used or stored as starch

• Sucrose is produced and transported to the leaves

• Sucrose is converted into glucose for energy

• Sucrose is stored as fat for later use

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 function of the AV node?

• Delays electrical impulse to allow atria to empty blood before ventricles contract

• Increases heart rate during exercise

• Transmits electrical impulses directly to the ventricles

• Regulates blood pressure in the arteries