Which amino acid is scarce in pulses?
**Core Concept**
The question tests the understanding of **amino acid profiles** in different food sources, specifically **pulses**. Pulses, such as lentils and beans, are known for their high protein content but often lack certain essential amino acids. **Protein quality** is determined by the presence and concentration of these essential amino acids.
**Why the Correct Answer is Right**
The correct answer is related to the fact that pulses are generally low in certain essential amino acids. One such amino acid that is often scarce in pulses is **methionine**. Methionine is an essential amino acid, meaning it cannot be synthesized by the body and must be obtained through the diet. Pulses, which are a staple in many diets around the world, are a good source of protein but lack sufficient methionine.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the amino acid profile of pulses.
**Option B:** Similarly, this option does not identify the correct amino acid that is scarce in pulses.
**Option C:** This option is also incorrect as it does not correspond to the amino acid that pulses are typically low in.
**Why Each Wrong Option is Incorrect (Continued)**
**Option D:** Although not specified, typically, options like this might include amino acids that are either not limiting in pulses or are not as relevant to the nutritional quality of pulse proteins.
**Clinical Pearl / High-Yield Fact**
It's crucial to understand that combining pulses with other protein sources, such as grains, can provide a complete amino acid profile. This concept is key in **plant-based diets** to ensure adequate protein quality.
**Correct Answer:** **D. Methionine**