Biology MCQs chapter#2 homeostasis

                         

                                      Biology MCQs chapter#2 homeostasis

Sure, here are 20 multiple-choice questions (MCQs) on the topic of homeostasis along with their answers:

Question 1: What is homeostasis?

a) A state of equilibrium within the body

b) A disorder in the body's internal environment

c) A sudden change in external temperature

d) A genetic mutation

Answer: a) A state of equilibrium within the body

Question 2: Which body system is primarily responsible for maintaining homeostasis?

a) Nervous system

b) Muscular system

c) Digestive system

d) Skeletal system

Answer: a) Nervous system

Question 3: What is the purpose of homeostasis?

a) To create instability within the body

b) To maintain a constant external environment

c) To regulate and maintain a stable internal environment

d) To eliminate all physiological fluctuations

Answer: c) To regulate and maintain a stable internal environment

Question 4: Which hormone is responsible for regulating blood sugar levels?

a) Estrogen

b) Insulin

c) Testosterone

d) Progesterone

Answer: b) Insulin

Question 5: When body temperature drops, what response does the body initiate to maintain homeostasis?

a) Sweating

b) Vasodilation

c) Shivering

d) Increased heart rate

Answer: c) Shivering

Question 6: What part of the brain plays a crucial role in regulating body temperature?

a) Cerebellum

b) Medulla oblongata

c) Hypothalamus

d) Cortex

Answer: c) Hypothalamus

Question 7: Which of the following is NOT a component of the feedback loop in homeostasis?

a) Stimulus

b) Response

c) Effector

d) Prognosis

Answer: d) Prognosis

Question 8: What happens to blood vessels during vasoconstriction?

a) They dilate

b) They contract

c) They become more permeable

d) They stop functioning

Answer: b) They contract

Question 9: Which of these is an example of negative feedback in homeostasis?

a) A thermostat maintaining a constant room temperature

b) Sweating to cool down the body on a hot day

c) Release of oxytocin during childbirth

d) Blood clotting after an injury

Answer: a) A thermostat maintaining a constant room temperature

Question 10: Which hormone is responsible for the fight-or-flight response during stress?

a) Cortisol

b) Melatonin

c) Thyroxine

d) Prolactin

Answer: a) Cortisol

Question 11: How does the body respond to high levels of carbon dioxide in the blood?

a) By slowing down breathing

b) By increasing heart rate

c) By releasing more oxygen into the blood

d) By constricting blood vessels

Answer: a) By slowing down breathing

Question 12: Which organ is responsible for filtering and excreting waste products from the blood?

a) Liver

b) Lungs

c) Kidneys

d) Stomach

Answer: c) Kidneys

Question 13: What is the purpose of the skin's sweat glands in maintaining homeostasis?

a) To regulate blood sugar levels

b) To release excess water from the body

c) To regulate body temperature through evaporation

d) To produce hormones

Answer: c) To regulate body temperature through evaporation

Question 14: Which of the following is an example of a positive feedback loop?

a) Blood clotting after an injury

b) Regulation of blood sugar levels

c) Regulation of body temperature

d) Uterine contractions during childbirth

Answer: d) Uterine contractions during childbirth

Question 15: What is the primary function of the respiratory system in maintaining homeostasis?

a) Regulating body temperature

b) Transporting nutrients to cells

c) Removing waste products, such as carbon dioxide

d) Producing hormones

Answer: c) Removing waste products, such as carbon dioxide

Question 16: How does the body respond to a decrease in blood pressure?

a) By dilating blood vessels

b) By decreasing heart rate

c) By increasing heart rate and constricting blood vessels

d) By relaxing skeletal muscles

Answer: c) By increasing heart rate and constricting blood vessels

Question 17: What role do electrolytes play in maintaining homeostasis?

a) They regulate blood sugar levels

b) They transmit nerve impulses and maintain fluid balance

c) They produce hormones

d) They regulate body temperature

Answer: b) They transmit nerve impulses and maintain fluid balance

Question 18: Which hormone is responsible for regulating calcium levels in the blood?

a) Insulin

b) Thyroxine

c) Parathyroid hormone (PTH)

d) Adrenaline

Answer: c) Parathyroid hormone (PTH)

Question 19: What is the purpose of the digestive system in maintaining homeostasis?

a) To regulate body temperature

b) To break down nutrients and provide energy to the body

c) To remove carbon dioxide from the blood

d) To produce antibodies

Answer: b) To break down nutrients and provide energy to the body

Question 20: How does the body respond to dehydration in order to maintain homeostasis?

a) By decreasing urine production

b) By increasing thirst sensation and conserving water

c) By increasing heart rate and blood pressure

d) By slowing down metabolic processes

Answer: b) By increasing thirst sensation and conserving water