Question 1

Which of the following best describes the main physiological challenge addressed by transport systems in multicellular organisms?

Accepted Answer

Distributing gases, nutrients, and metabolites to all cells

Question 2

In plants, which vessel is primarily responsible for the long-distance transport of water and minerals from roots to shoots?

Accepted Answer

Xylem

Question 3

Which of the following best explains how blood pressure drives the unidirectional flow of blood in the mammalian cardiovascular system?

Accepted Answer

Blood flows from areas of high pressure to low pressure

Question 4

Which equation correctly represents the relationship between blood flow velocity ($$v$$), cross-sectional area ($$A$$), and blood flow rate ($$Q$$)?

Accepted Answer

$$Q = v 	imes A$$

Question 5

Which structure in the heart initiates the electrical impulse that regulates the cardiac cycle?

Accepted Answer

Sinoatrial (SA) node

Question 6

Which of the following best describes the cohesion-tension hypothesis for water transport in plants?

Accepted Answer

Water is pulled up the xylem due to transpiration and cohesion between water molecules

Question 7

Which of the following is a correct path for the flow of blood through the mammalian heart?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → lungs

Question 8

Which of the following best describes the role of stomata in plant transport?

Accepted Answer

They regulate the flow of water vapor and gas exchange

Question 9

Which of the following is a key difference between arteries and veins?

Accepted Answer

Arteries have thicker walls to withstand higher pressure

Question 10

Which of the following best describes the bulk flow of sugars in the phloem?

Accepted Answer

Sugars move from source to sink by pressure-driven bulk flow

Question 11

Which of the following correctly describes the role of the lymphatic system in mammalian circulation?

Accepted Answer

It returns excess interstitial fluid to the bloodstream

Question 12

Which of the following best explains the effect of increased capillary cross-sectional area on blood flow velocity?

Accepted Answer

Blood flow velocity decreases

Question 13

Which of the following is the correct sequence for the path of water and minerals from soil to leaves in a plant?

Accepted Answer

Root hair → cortex → xylem → leaf mesophyll

Question 14

Which of the following best describes the difference between single and double circulation systems?

Accepted Answer

Single circulation passes blood through the heart once per circuit; double circulation passes blood twice

Question 15

Which of the following best describes the role of osmotic pressure in capillary exchange?

Accepted Answer

It pulls fluid into the capillaries

Question 16

Which of the following is a correct description of the symplastic route in plant transport?

Accepted Answer

Materials move through the cytoplasm via plasmodesmata

Question 17

A patient has a heart murmur due to a malfunctioning valve. Which valve is most likely affected if blood is leaking back from the left ventricle into the left atrium?

Accepted Answer

Mitral (bicuspid) atrioventricular (AV) valve

Question 18

Which of the following best describes the process of transpiration in plants?

Accepted Answer

The loss of water vapor from leaves through stomata

Question 19

Which of the following equations correctly represents water potential ($$\Psi) in $$plants?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 20

Which of the following best describes the function of capillaries in the circulatory system?

Accepted Answer

They are the primary site of exchange of gases, nutrients, and wastes

Transport Systems in Plants and Animals: Structure, Function, and Mechanisms

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