Question 1

Which of the following best explains why water moves from the soil into plant roots?

Accepted Answer

Water moves from areas of higher to lower water potential, driven by differences in solute concentration and pressure.

Question 2

A plant is growing in soil with a high pH (alkaline). Which of the following is most likely to occur?

Accepted Answer

Mineral availability will decrease because fewer H+ ions are present to displace cations from soil particles.

Question 3

Which process is responsible for the long-distance movement of water and minerals from roots to leaves in plants?

Accepted Answer

Bulk flow driven by a pressure gradient

Question 4

A farmer applies a fertilizer with an N-P-K ratio of 20-10-10. Which nutrient is most likely to directly increase crop yield, and why?

Accepted Answer

Nitrogen, because it is essential for making proteins, nucleic acids, and chlorophyll.

Question 5

Which of the following best describes the role of Rhizobium bacteria in the nitrogen cycle?

Accepted Answer

They convert atmospheric nitrogen ($$N_2) $$into ammonia ($$NH_3$$), making nitrogen available to plants.

Question 6

A plant is exposed to red light followed by far-red light. According to the function of phytochromes, what is the most likely outcome?

Accepted Answer

The plant will remain in a dormant state because far-red light inactivates phytochromes.

Question 7

Which hormone is primarily responsible for closing stomata during drought stress, and what is its mechanism?

Accepted Answer

Abscisic acid (ABA); it signals guard cells to close stomata, reducing water loss.

Question 8

Which of the following is a correct sequence of events in the double fertilization process of angiosperms?

Accepted Answer

One sperm fertilizes the egg to form a diploid zygote; the other sperm fuses with two polar nuclei to form a triploid endosperm.

Question 9

A plant with a mutation that eliminates the function of B genes in the ABC model of flower development will produce flowers with which organs?

Accepted Answer

Only sepals and carpels

Question 10

Which of the following best explains why endotherms generally have higher metabolic rates than ectotherms?

Accepted Answer

Endotherms generate most of their body heat through metabolic processes, requiring more energy.

Question 11

A patient with diabetes mellitus has high blood glucose levels even after eating. Which hormone is most likely deficient or not functioning properly?

Accepted Answer

Insulin

Question 12

Which of the following is a key advantage of a closed circulatory system compared to an open circulatory system?

Accepted Answer

It allows for more efficient regulation of blood flow to specific organs.

Question 13

Which of the following best describes the function of the sinoatrial (SA) node in the human heart?

Accepted Answer

It acts as the pacemaker, initiating the electrical impulses that set the heart rate.

Question 14

A person is exposed to cold temperatures for several weeks and develops a thicker fur coat. This is an example of:

Accepted Answer

Acclimatization

Question 15

Which of the following is a correct description of the countercurrent exchange mechanism in fish gills?

Accepted Answer

Blood and water flow in opposite directions, maintaining a gradient that favors diffusion of oxygen into the blood.

Question 16

Which of the following best explains why herbivores generally have longer alimentary canals than carnivores?

Accepted Answer

Herbivores need more time and surface area to digest plant cell walls.

Question 17

Which of the following is a function of the hormone abscisic acid (ABA) in plants?

Accepted Answer

Induces seed dormancy and enhances drought tolerance by closing stomata

Question 18

Which of the following best describes the process of cation exchange in soils?

Accepted Answer

H+ ions displace mineral cations from soil particles, making them available for plant uptake.

Question 19

Which of the following is a real-world consequence of excessive fertilizer runoff into waterways?

Accepted Answer

Toxic algal blooms that can harm aquatic ecosystems and water quality.

Resource Acquisition, Nutrition, Transport, and Internal Regulation in Plants and Animals

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