Question

SAND SILT CORAL
Daylight 15 10 13
Night 5 30 3
A student wanted to know where a particular type of fish was most likely to be found during a 24-hour period. He observed a total of 76 fish over several days. According to his observation, the conclusion is

• A. The fish don't have a preference for substrate
• B. The fish are more active at night
• C. The fish prefer coral to silt during the day
• D. The fish prefer silt at night
• E. All of the above are true

Answer 1

Answer: (D)

The fish prefer silt at night

From the data given, fish have different preferences for different types of water according to the time of the day. For sand, they prefer nighttime. For silt, they prefer silt and for coral, they prefer daylight. That is, they prefer silt at night and sand and coral during the daytime.

So, the correct answer is 'The fish prefer silt at night'.