- A) By drinking seawater
- B) By producing concentrated urine
- C) By actively absorbing salts
- D) By excreting dilute urine
AP Biology MCQ
Total MCQ: 70
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22 Which of the following is true about euryhaline organisms?
- A) They cannot tolerate salinity changes
- B) They thrive only in freshwater
- C) They can survive in varying salinities
- D) They are all marine fish
23 What is the main organ for osmoregulation in humans?
- A) Liver
- B) Heart
- C) Kidneys
- D) Lungs
24 How do marine fish cope with the hypertonic environment?
- A) They produce more urine
- B) They drink large amounts of water
- C) They excrete excess water
- D) They absorb salt through their skin
25 What is the function of the rectal gland in sharks?
- A) Absorbing nutrients
- B) Excreting salt
- C) Regulating blood pH
- D) Maintaining buoyancy
26 Which term describes animals that excrete urea as their primary nitrogenous waste?
- A) Ureotelic
- B) Ammonotelic
- C) Uricotelic
- D) Aquatic
27 How do plants regulate water loss?
- A) Through transpiration
- B) By photosynthesis
- C) By respiration
- D) Through osmosis
28 What is osmoregulation?
- A) Balancing oxygen levels
- B) Maintaining water and salt balance
- C) Regulating blood pressure
- D) Controlling glucose levels
29 Which hormone plays a key role in water reabsorption in humans?
- A) Insulin
- B) Aldosterone
- C) Antidiuretic hormone (ADH)
- D) Thyroxine
30 What type of organisms are osmoconformers?
- A) Freshwater fish
- B) Marine invertebrates
- C) Terrestrial mammals
- D) Amphibians