JAMB 2024 Biology · Question 110
An example of organism that exhibits counter-shading to escape from its predator is
Options
- A.grasshopper
- B.toad
- C.fish
- D.chameleon
Answer: C. fish
Explanation written with AI and checked against the answer key
Step 1: Analyze the question The question asks which organism uses counter-shading as a way of escaping predators.
Step 2: Explain the concept Counter-shading is a type of camouflage where an animal's upper surface (dorsal) is darker and its underside (ventral) is lighter.
- Seen from above, the dark back blends with the dark water or ground below.
- Seen from below, the light belly blends with the bright sky or water surface.
- Light from above makes the top look brighter and the underside shadowed. Counter-shading cancels this out, so the body looks flat and less visible.
This is most typical of aquatic animals such as fish, sharks, dolphins and penguins.
Step 3: Evaluate the options
- A. Grasshopper: uses general camouflage (green or brown body to match grass). This is not counter-shading.
- B. Toad: has a warty, brown skin that blends with soil and can secrete toxins. It is not a classic example of counter-shading.
- C. Fish: has a dark back and a silvery-white belly. This is the classic example of counter-shading.
- D. Chameleon: changes its colour to match its surroundings. This is adaptive colour change, not counter-shading.
Step 4: Answer The correct option is C. fish.
Tip: Remember "dark on top, light below, like a fish on the go." If you see counter-shading in a question, think of fish first. Chameleon means colour change, and grasshopper means camouflage by matching the background.
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