Question 1

Which of the following best explains why larger animals do not simply have larger cells to accommodate their increased volume?

Accepted Answer

Larger cells would have a decreased surface area-to-volume ratio, limiting efficient exchange of materials with the environment.

Question 2

A fish swimming rapidly in water is most likely to have which of the following body shapes, and why?

Accepted Answer

A streamlined body that is blunt at the front and tapers at the rear, to reduce drag according to physical laws.

Question 3

Which of the following is an example of a regulator in terms of homeostasis?

Accepted Answer

A mammal maintaining a constant internal body temperature despite changes in external temperature.

Question 4

Which process is primarily responsible for the movement of heat from a warmer object to a cooler one without direct contact?

Accepted Answer

Radiation

Question 5

A lizard basks in the sun to raise its body temperature. This is an example of which thermoregulatory strategy?

Accepted Answer

Ectothermy

Question 6

Which of the following best describes the function of countercurrent exchange in animal physiology?

Accepted Answer

It minimizes heat loss by allowing heat to transfer from warm blood to cold blood flowing in the opposite direction.

Question 7

During a fever, the body’s thermostat is reset to a higher temperature. What is a potential benefit of this physiological response?

Accepted Answer

It interferes with bacterial replication by increasing the rate of chemical reactions.

Question 8

Which of the following equations correctly represents the relationship between surface area (SA) and volume (V) for a spherical cell of radius $$r$$?

Accepted Answer

$$SA = 4 \pi r^2$, V$$ = \frac{4}{3} \pi $$r^3$$

Question 9

Which of the following best explains why ruminants can digest cellulose efficiently?

Accepted Answer

They have specialized stomach compartments containing bacteria and protozoa that break down cellulose.

Question 10

A patient is experiencing dehydration. Which part of the nephron is primarily responsible for reabsorbing water back into the bloodstream?

Accepted Answer

The descending loop of Henle

Question 11

Which of the following statements about the circulatory system of fish is correct?

Accepted Answer

Fish have a single circuit circulatory system with one pump (atrium and ventricle).

Question 12

Which of the following best describes the function of surfactant in mammalian lungs?

Accepted Answer

It prevents alveoli from collapsing by reducing surface tension.

Question 13

Which of the following is a correct sequence of structures that food passes through in the human digestive tract?

Accepted Answer

Oral cavity $$\rightarrow$$ pharynx $$\rightarrow$$ esophagus $$\rightarrow$$ stomach

Question 14

Which of the following best explains why marine bony fish must drink seawater?

Accepted Answer

They are hypoosmotic to their environment and lose water by osmosis, so they drink seawater to replace lost water.

Question 15

Which of the following is a primary function of the large intestine in mammals?

Accepted Answer

Recovery of water from undigested food material

Question 16

Which of the following best describes the role of the hypothalamus in energy regulation?

Accepted Answer

It controls food intake in response to energy expenditure and blood glucose levels.

Question 17

Which of the following statements about gas exchange in insects is correct?

Accepted Answer

Insects use a tracheal system that delivers oxygen directly to tissues via spiracles and tracheae.

Question 18

Which of the following best describes the difference between osmoconformers and osmoregulators?

Accepted Answer

Osmoconformers allow their body fluid osmolarity to match the environment, while osmoregulators actively maintain internal osmolarity within a narrow range.

Question 19

Which of the following is a correct description of the function of capillaries in the circulatory system?

Accepted Answer

They are the smallest blood vessels and the primary site for diffusion of gases, nutrients, and wastes between blood and tissues.

General Biology Study Notes: Animal Form, Function, Nutrition, Circulation, and Gas Exchange

Guida di studio - Domande di pratica

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