Question 1

Which of the following best explains why arteries have thicker walls than veins?

Accepted Answer

Arteries must withstand higher pressure generated by the heart during systole.

Question 2

A patient is diagnosed with a defective sinoatrial (SA) node. Which of the following symptoms would most likely result from this condition?

Accepted Answer

Irregular heartbeat due to disrupted pacemaker activity.

Question 3

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

Accepted Answer

Single circulation involves one circuit through the heart, while double circulation involves two circuits: pulmonary and systemic.

Question 4

During the cardiac cycle, what is occurring during ventricular systole?

Accepted Answer

The ventricles contract, pumping blood into the aorta and pulmonary artery.

Question 5

Which of the following is a key difference between innate and adaptive immunity?

Accepted Answer

Innate immunity is non-specific and present from birth, while adaptive immunity is specific and develops after exposure to antigens.

Question 6

A person receives a vaccine containing an inactivated virus. Which immune response is primarily responsible for the long-term protection provided by the vaccine?

Accepted Answer

The formation of memory B and T cells during the adaptive immune response.

Question 7

Which of the following best describes the process of clonal selection in adaptive immunity?

Accepted Answer

Antigen binding stimulates specific lymphocytes to divide and produce identical cells.

Question 8

Which of the following is a derived trait that distinguishes land plants from charophyte algae?

Accepted Answer

Alternation of generations with multicellular, dependent embryos.

Question 9

In the alternation of generations in plants, which structure produces gametes, and by what process?

Accepted Answer

The gametophyte produces gametes by mitosis.

Question 10

Which of the following correctly matches a flower part with its function?

Accepted Answer

Stigma – receives pollen during pollination.

Question 11

Which of the following best explains why seeds are an evolutionary advantage for plants?

Accepted Answer

Seeds protect the embryo and provide a food supply, allowing for dispersal and survival in harsh conditions.

Question 12

A botanist observes a plant with parallel leaf veins, fibrous roots, and flower parts in multiples of three. This plant is most likely a:

Accepted Answer

Monocot

Question 13

Which of the following is the correct sequence of zones in the primary growth of a root, starting from the tip upward?

Accepted Answer

Root cap → Zone of cell division → Zone of elongation → Zone of differentiation

Question 14

Which tissue forms the wood of a tree?

Accepted Answer

Secondary xylem

Question 15

Which of the following best describes the cohesion-tension mechanism in plants?

Accepted Answer

Water is pulled upward through xylem due to transpiration and the cohesive properties of water molecules.

Question 16

A plant is wilting due to loss of turgor pressure. Which of the following best explains this phenomenon?

Accepted Answer

Water has left the plant cells, causing the plasma membrane to pull away from the cell wall.

Question 17

Which of the following is a function of mycorrhizal fungi in plant nutrition?

Accepted Answer

They increase the surface area for water and mineral absorption by forming mutualistic associations with roots.

Question 18

Which of the following best describes the role of the Casparian strip in plant roots?

Accepted Answer

It forces water and solutes to cross the plasma membrane of endodermal cells, regulating entry into the vascular cylinder.

Question 19

Which of the following correctly matches a plant tissue with its primary function?

Accepted Answer

Phloem – transports sugars from sources to sinks.

Question 20

A legume plant is growing in nitrogen-poor soil. Which adaptation allows it to thrive in this environment?

Accepted Answer

Formation of root nodules housing nitrogen-fixing bacteria.

General Biology Study Guide: Circulatory System, Immune System, and Plant Biology

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