Odd One Out — Tomato, Gourd, Brinjal (Eggplant), and Cucumber are all edible plant fruits; identify the one that uniquely ripens after harvest (climacteric) whereas the others are non-climacteric.

Introduction / Context:
Many edible “vegetables” are botanically fruits. A subtle but important post-harvest trait distinguishes them: climacteric fruits continue ripening after harvest, while non-climacteric fruits do not. We will use this to find the outlier.

Given Data / Assumptions:

• Tomato is climacteric (continues to ripen off the plant).
• Gourd is non-climacteric.
• Brinjal (eggplant) is generally treated as non-climacteric for storage/marketing.
• Cucumber is non-climacteric.

Concept / Approach:
Classify each item by post-harvest respiration/ethylene behavior and select the unique climacteric item.

Step-by-Step Solution:
Tomato → climacteric → can ripen further after harvest.Gourd → non-climacteric → minimal ripening off-vine.Brinjal → non-climacteric handling; quality declines post-harvest without ripening benefit.Cucumber → non-climacteric.Hence tomato is the lone climacteric item.

Verification / Alternative check:
Ethylene sensitivity also aligns: climacteric fruits respond strongly to ethylene for ripening; non-climacteric ones show limited ripening response.

Why Other Options Are Wrong:

• Gourd: non-climacteric; matches the majority.
• Brinjal: non-climacteric behavior; matches the majority.
• Cucumber: non-climacteric; matches the majority.

Common Pitfalls:
Using family classification (Solanaceae vs Cucurbitaceae) leads to a 2–2 split, not a single outlier. The climacteric property yields a unique choice.

Final Answer:
Tomato