Question

The percentage of protein in soybean is:

• A. 42%
• B. 50%
• C. 60%
• D. 80%

Hint:

Soybean is famous for having the highest protein share among common crops, at just over two fifths of its weight.

Answer 1

The Correct Option is A

Step 1: Understand what the question is asking.
The question wants the approximate share of protein present in soybean by weight.

Step 2: Recall the composition of soybean.
Soybean is well known as the richest common plant source of protein. On average, dry soybean seeds contain about 40 to 43 percent protein, along with around 20 percent fat, 30 percent carbohydrate, and the remaining share as fibre, moisture, and minerals. This is why soybean is used to make protein rich foods such as tofu and soy milk.

Step 3: Rule out the other options.
Values of 50 percent, 60 percent, and 80 percent are all too high, since a large part of the soybean seed is made up of fat and carbohydrate, not protein. No common food crop reaches such a high protein share.

Step 4: Final answer.
The protein content of soybean is closest to 42 percent.
\[ \boxed{42\%} \]