One important characteristics of green plant is that they

Analyze the question: It asks for an important characteristic of green plants. The option "Are autotropic" is almost certainly a typo for "autotrophic" (the word "autotropic" isn't a standard biology term).

Explain the concept: Green plants contain chlorophyll, which lets them trap light energy and make their own food by photosynthesis:

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in the presence of light and chlorophyll)

Organisms that make their own food from simple inorganic substances are called autotrophs. This is the defining feature of green plants.

Check each option:

• A. Possess specialized sense organs: Wrong. This is a feature of animals (eyes, ears, nose, etc.). Plants lack specialized sense organs.
• B. Are usually motile: Wrong. Most plants are fixed in one place (sessile) and do not move from place to place. Animals are the ones that are usually motile.
• C. Are autotropic (autotrophic): Correct. Green plants make their own food by photosynthesis.
• D. Respond slowly to stimuli: This is true to some extent, since plants respond through growth movements (tropisms) that are slow. However, it is not the distinguishing feature of green plants in the way feeding mode is. Also, some plants respond fast (e.g., Mimosa pudica, the sensitive plant).

Note on the wording: "Autotropic" looks like a misspelling of "autotrophic." "Tropic" relates to growth responses to stimuli (tropism), while "trophic" relates to nutrition.

Answer: C. Are autotropic (meaning autotrophic)

Exam tip: Remember the word parts: auto = self, troph = feeding, so autotroph = "self-feeder." Don't mix it up with tropism (growth response to stimuli). In JAMB, when you see a near-miss spelling like this, choose the option that makes biological sense.