Question

science sparks

1. the picture below shows brooklyns fish tank, which has a lamp, live plants, and fish in it.

image of fish tank with lamp
why will brooklyns fish not survive if she unplugs the lamp?
a. the fish need carbon dioxide to breathe, and the light from the lamp allows carbon dioxide to dissolve into the water.
b. the fish need oxygen and food to live, and the lamp gives the plants light that they use to make oxygen and food for the fish.
c. the fish need light to live, and the lamp gives the fish the light they need to make their own food.
d. the fish need warm water to live, and the lamp’s light warms the water enough for the fish to live.
explain your reasoning:

Explanation:

• Option A: Fish breathe oxygen, not CO₂, so A is wrong.
• Option B: Plants use light for photosynthesis, producing oxygen (for fish) and glucose (food for fish or plants). Without light, plants can't do this, harming fish. This matches.
• Option C: Fish are heterotrophs, can't make their own food via light. C is wrong.
• Option D: A lamp's main role here isn't warming (aquariums have heaters), and the question relates to biological processes (plants - fish interaction), so D is wrong.

Answer:

B. The fish need oxygen and food to live, and the lamp gives the plants light that they use to make oxygen and food for the fish.