In agricultural science, which crop is popularly known as Green Gold because of its high commercial and economic value?

Introduction / Context:
Many crops receive special nicknames that reflect their economic importance. The term Green Gold is especially famous in general knowledge and agricultural science exams. It is linked with a crop that brings in a large amount of income and foreign exchange, particularly in hilly regions of countries such as India and Sri Lanka.

Given Data / Assumptions:

• The question asks for the crop popularly called Green Gold.
• The options list common crops like coffee, neem, tea, rice and rubber.
• We focus on standard school level general knowledge usage.

Concept / Approach:
In many school textbooks and competitive exams, tea is referred to as Green Gold. The term highlights the high commercial value of tea plantations and the continuous evergreen appearance of tea bushes on hill slopes. Tea plantations provide employment, export earnings and regular cash flow. Although other crops such as rubber and some trees may also be highly valuable, the most widely accepted answer for Green Gold in general science and general knowledge questions is tea.

Step-by-Step Solution:
Step 1: Recall the common association of Green Gold with a plantation crop grown on hill slopes. Step 2: Think of regions like Assam, Darjeeling and Nilgiris, which are famous tea growing areas often described as green carpets. Step 3: Remember that textbooks and exam guides regularly use the phrase tea is known as Green Gold. Step 4: Match this information with the options and choose tea as the correct crop.

Verification / Alternative check:
Check each option against the nickname. Coffee and rubber are valuable plantation crops, but the traditional textbook nickname Green Gold most strongly matches tea. Neem is known for medicinal and pesticidal uses, not this economic nickname. Rice is a staple food crop but not commonly called Green Gold in standard school level general knowledge. Therefore tea fits best.

Why Other Options Are Wrong:
Option A, coffee, is important but usually not called Green Gold in basic exam questions. Option B, neem, is famous as a medicinal and bio pesticide tree rather than for a Green Gold type economic nickname. Option D, rice, is the chief food crop in many countries but is not typically given this title in school texts. Option E, rubber, is indeed valuable, but the standard general knowledge question generally expects tea as the answer for Green Gold.

Common Pitfalls:
Students may overthink and choose coffee or rubber because they know these are export crops. The safest method is to recall the exact phrase used in textbooks and competitive exam notes, which clearly link Green Gold with tea. Sticking to what is most commonly tested avoids confusion.

Final Answer:
The crop popularly known as Green Gold in general knowledge questions is Tea.