Show:
NUTRITION
DIGESTIVE
RESPIRATORY
CIRCULATORY
EXCRETORY
100

A small island ecosystem loses most of its plant population after a volcanic eruption. Several months later, herbivore populations decline, followed by carnivore populations. Which explanation best describes this pattern?

  • Animals require soil nutrients directly from plants to survive.
  • Plants regulate oxygen levels needed only by carnivores.
  • Animals cannot perform photosynthesis to generate their own glucose.
  • Plants serve as primary producers that provide energy for the food chain.
  • Plants serve as primary producers that provide energy for the food chain.
100

Which organ produces bile for fat digestion?

LIVER

100

Why do guard cells control the opening and closing of stomata in plants?

  • To regulate gas exchange and water loss
  • To produce glucose during respiration
  • To transport minerals to the roots.
  • To absorb sunlight for photosynthesis.

To regulate gas exchange and water loss

100

What is the main function of the circulatory system?

  • To transport oxygen, nutrients, and wastes on the body.
  • To digest food and absorb nutrients in the intestine.
  • To produce hormones that regulate body functions.
  • To remove solid waste from the digestive tract.
  • To transport oxygen, nutrients, and wastes on the body.
100
  • In which structure of the nephron does filtration of blood initially occur?

GLOMERULUS

200

In a laboratory experiment, scientists compare two ecosystems. Ecosystem A contains plants, herbivores, and carnivores, while Ecosystem B contains only herbivores and carnivores but no plants. Over time, Ecosystem B collapses. Which explanation best accounts for this result?

  • Animals cannot produce oxygen through respiration.
  • Animals cannot synthesize organic molecules from CO2.
  • Animals require sunlight to carry out metabolic processes.
  • Animals require mineral nutrients from plants for digestion.
  • Animals cannot synthesize organic molecules from CO2.
200

Which organ connects the pharynx to the stomach?

ESOPHAGUS

200

What protein in red blood cells transports oxygen in the blood?

HEMOGLOBIN

200

Why are capillaries ideal for exchanging materials with body cells?

  • They have thick muscular walls for strong pumping.
  • They have thin walls that allow diffusion of substances.
  • They contain valves that regulate blood pressure.
  • They store oxygen before it reaches tissues.

They have thin walls that allow diffusion of substances.

200

A toxin damages the loop of Henle, preventing it from establishing the osmotic gradient necessary for water reabsorption. What is the most likely consequence for urine formation?

  • Urine becomes very dilute because water cannot be efficiently reabsorbed.
  • Urine becomes extremely concentrated because filtration increases.
  • Blood cells appear in urine due to filtration damage.
  • Glucose digestion stops in the nephron.
  • Urine becomes very dilute because water cannot be efficiently reabsorbed.
300

Why do plants require mineral nutrients from the soil in addition to sunlight?

  • To produce energy directly through respiration.
  • To increase the amount of water absorbed by roots.
  • To support metabolic processes and plant growth.
  • To replace the oxygen produced during photosynthesis.
  • To support metabolic processes and plant growth.
300

A patient has severe diarrhea that causes food to move too quickly through the large intestine. What is the most likely result?

  • Excess water is absorbed, causing constipation
  • Too little water is absorbed, causing watery stools
  • Protein digestion stops in the stomach
  • Carbohydrate digestion stops in the mouth       

Too little water is absorbed, causing watery stools

300

What plant structure allows gas exchange in leaves?

STOMATA

300

Why is the circulatory system important for cellular respiration?

  • It produces glucose used for energy production
  • It transports oxygen needed by cells to produce ATP
  • It removes digestive enzymes from the bloodstream
  • It converts nutrients into hormones for the body

It transports oxygen needed by cells to produce ATP

300

During an experiment, a drug blocks ADH (antidiuretic hormone) receptors in the kidney collecting ducts. The subject drinks normal amounts of water. Which chain of events would most likely occur?

  • Reduced water reabsorption → large volume of dilute urine → risk of dehydration
  • Increased water reabsorption → small volume of concentrated urine → increased blood pressure
  • Reduced filtration in the glomerulus → decreased urine production → toxin accumulation
  • Increased secretion of ions → reduced blood osmotic balance → kidney failure
  • Reduced water reabsorption → large volume of dilute urine → risk of dehydration
400

What is respiration?

  • The process of producing glucose in plants.
  • The process of inhaling oxygen and releasing CO2.
  • The process of absorbing nutrients in the intestine.
  • The process of transporting oxygen in the blood.

The process of inhaling oxygen and releasing CO2.

400

A patient suffers damage to the glomerular filtration membrane, making it unusually permeable. Laboratory tests show proteins and blood cells in the urine. Which physiological explanation best accounts for this result?

  • The filtration barrier has lost its selectivity, allowing large molecules to pass into the filtrate
  • The renal tubules have stopped reabsorbing nutrients into the bloodstream
  • The collecting duct cannot transport urine toward the renal pelvis
  • The bladder cannot store urine properly
  • The renal tubules have stopped reabsorbing nutrients into the bloodstream
500

Which organ temporarily stores urine before it is expelled from the body?

URINARY BLADDER