General Biology 2: Plant Nutrition

Subject: Biology 2

Topic: Plant Nutrition

Difficulty: Hard

Questions: 5

Passing Score: 70%

A plant is kept in a sealed room with sunlight and water but no Carbon Dioxide. Why will this "Autotroph" eventually starve?

A: Carbon Dioxide is the primary source of water for the roots.

B: Plants require CO2 as an inorganic substance to manufacture their own food; without it, photosynthesis stops.

C: CO2 is used by plants to produce the heat needed for growth.

D: Without CO2, the plant cannot breathe through its lungs.

Why must a "Respiratory Surface" (like the Alveoli in humans or Gills in fish) remain extremely thin and moist?

A: To prevent the organism from becoming too heavy.

B: To allow gases to dissolve in water and diffuse efficiently across the cell membrane into the bloodstream.

C: To act as a reservoir for storing sunlight.

D: To prevent the animal from losing too much weight during gas exchange.

A fish survives in water with low oxygen levels, but suffocates in air which has 21% oxygen. Why do the Gills fail on land?

A: The air is too rich in oxygen, causing the fish's blood to boil.

B: The delicate gill filaments collapse and dry out in the air, losing the surface area necessary for gas exchange.

C: Gills are designed to extract oxygen only from the hydrogen molecules in water.

D: Fish cannot breathe oxygen in its gaseous form.

During a hot afternoon, a plant closes its "Stomata" to prevent wilting. What is the physiological "price" the plant pays for this protection?

A: It can no longer absorb minerals from the soil.

B: It blocks the intake of CO2, effectively pausing its ability to produce food.

C: The plant's leaves will immediately turn bronze and fall off.

D: It forces the plant to become a heterotroph and eat insects.

How does the "Heterotrophic" strategy of a human compare to that of a carnivorous plant?

A: Humans produce their own food, while carnivorous plants do not.

B: Both must obtain organic molecules from other organisms, but the plant uses insects primarily for minerals while humans use food for energy.

C: Humans are autotrophs because they eat plants.

D: There is no difference; both rely solely on sunlight for nutrition.

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