Regents Prep: Living Environment
Multiple-Choice Questions
Regents Prep Living Environment: Topical Multiple-Choice Question Archive
Use of Topical Archive Multiple-Choice Questions

Feel free to copy and paste any of the multiple-choice questions below for use in creating your own Regents-style assessments.

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Feedback Mechanism: Question 1 of 11
During a race, the body temperature of a runner increases. The runner responds by perspiring, which lowers body temperature. This process is an example of
  1. maintenance of homeostasis
  2. an antigen-antibody reaction
  3. an acquired characteristic
  4. environmental factors affecting phenotype

Correct Answer Number: 1

Explanation: Homeostasis is the maintenance of a stable, internal environment. In trying to keep a body temperature of 98.6 degrees Fahrenheit, if your body heats up due to exercise, sweating cools your body temperature by allowing heat to escape through your pores when the sweat evaporates.

Feedback Mechanism: Question 2 of 11
A pulse can be detected most easily in
  1. an artery
  2. a vein
  3. a capillary
  4. a lacteal

Correct Answer Number: 1

Explanation: Arteries are under much greater pressure than veins because they are carrying blood away from the heart which is the pumping machine to force blood to move to all of the body. Every time the hear contracts, it can be felt in an artery where a surge of blood has just been forced. A capillary is too small to feel a pulse and a lacteal is part of the lymphatic system found in the small intestine.

Feedback Mechanism: Question 3 of 11
Which row in the chart contains the words that best complete this statement? The (I) glands produce (II), which are transported by the (III) system.

  1. A
  2. B
  3. C
  4. D

Correct Answer Number: 3

Explanation: The endocrine glands produce hormones, which are transported by the circulatory system. The digestive system makes enzymes that are secreted directed via ducts to the organ that needs them.

Feedback Mechanism: Question 4 of 11
In animals, enzymes and hormones are similar in that both substances
  1. do not contain the element nitrogen
  2. function only within cells
  3. are products of cell synthesis
  4. must be ingested

Correct Answer Number: 3

Explanation: Enzymes and hormones must be made within cells, or synthesized (not ingested). They are large protiens so they, in fact, do contain nitrogen. They are secreted outside of the cells and are used in digestive organs (enzymes) or travel through the blood to affect other body parts (hormones).

Feedback Mechanism: Question 5 of 11
Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was most likely caused by an
  1. unequal distribution of auxin in the stem
  2. unequal distribution of a neurotransmitter in the stem
  3. equal distribution of auxin in the stem
  4. equal distribution of a neurotransmitter in the stem

Correct Answer Number: 1

Explanation: The plant hormone, or auxin, is distributed on the side away from the light causing cells on that side to grow faster, which in turn, causes the plant to bend toward the light. If the distribution were equal, the plant would grow just upwards. Neurotransmitters are chemicals secreted by multicellular animals and are used in transmitting impulses in the nervous system.

Feedback Mechanism: Question 6 of 11
A student accidentally places her hand on a tack and quickly pulls her hand away. The tack represents
  1. a stimulus
  2. an impulse
  3. a response
  4. an effector

Correct Answer Number: 1

Explanation: A stimulus is anything that causes a response. The tack was detected by a receptor in the students hand, impulses were sent from sensory neurons to interneurons in the students spinal cord, to motor neurons, which caused effectors in the students hand to contract the muscles, causing the movement. This is called a reflex. The impulse is the electrochemical charge that travels along the neurons, the response is the effect, or moving the hand, and the effector is the muscle or gland that causes the response.

Feedback Mechanism: Question 7 of 11
The diagram below represents part of the lower surface of a ben leaf. With which process is area X most closely associated?

  1. digestion
  2. reproduction
  3. phototropism
  4. transpiration

Correct Answer Number: 4

Explanation: Guard cells regulate the opening on the under side of leaves, called the stomate. The stomate allows water vapor to escape from the xylem tubes. Phototropism is the plants growth response toward light, of which the stomate is not involved.

Feedback Mechanism: Question 8 of 11
In humans, the concentration of carbon dioxide in the plasma
  1. causes increased production of hydrochloric acid
  2. regulates gastric acid production by forming carbonic acid
  3. regulates breathing rate by its effect on the medulla
  4. causes inflammation of the tissues of the bronchial tubes

Correct Answer Number: 3

Explanation: The medulla oblongata at the base of the brain increases breathing rate if the amount of carbon dioxide increases. It does not regulate breathing rate by checking oxygen content.

Feedback Mechanism: Question 9 of 11
Animal activities such as metamorphosis are most directly controlled by
  1. lachrymal fluid
  2. hormones
  3. gastric juice
  4. neurohumors

Correct Answer Number: 2

Explanation: Hormones are chemical regulators that control many activities in animals, including metamorphosis of tadpoles into frogs and caterpillars into butterflies.

Feedback Mechanism: Question 10 of 11
Homeostasis in living things is regulated by the action of
  1. the nervous system, only
  2. the endocrine system, only
  3. both the nervous and endocrine systems
  4. neither the nervous nor the endocrine system

Correct Answer Number: 3

Explanation: Homeostasis, maintaining a stable, internal environment, is controlled by nerves (in animals) and hormones, or chemical regulators in all living organisms.

Feedback Mechanism: Question 11 of 11
Plants bend toward a light source as a result of
  1. the increased amount of food synthesized by their leaves
  2. an unequal auxin distrubution in their stems
  3. the necessity of light for transpiration
  4. an inability to synthesize chemical regulators

Correct Answer Number: 2

Explanation: Plant hormones, auxins, are produced in the meristematic regions of the plant, one of which is the tips of the stems. These auxins initiate growth in the plant. If the sunlight is normally found directly above the plant, the auxins are distributed evenly and the plant grows upwards. If, however, the light is found more on one side of the plant, the auxins are produced unevenly. More auxin will be produced on the side away from the light. Then the plant on that side will grow more, causing it to bend, or grow, towards the light.

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