Q.46 Which of the following is most abundant in the aleurone layer of wheat seeds?
(A) Tannin
(B) Starch
(C) Protein
(D) Lipid
The correct answer is: (C) Protein. The aleurone layer of wheat (and other cereals like maize) is especially rich in storage protein, not starch, tannin or lipid.
Correct Answer: Protein in Aleurone Layer
In wheat seeds, the aleurone layer is a single outermost layer of cells of the endosperm that is rich in protein, forming dense aleurone grains inside the cells.
These aleurone cells do not store starch granules like the starchy endosperm; instead, they accumulate proteins, minerals, vitamins and other bioactive compounds important for germination.
Therefore, for the question:
Which of the following is most abundant in the aleurone layer of wheat seeds?
(A) Tannin
(B) Starch
(C) Protein
(D) Lipid
The correct option is (C) Protein.
Explanation of All Options
Option A: Tannin
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Tannins are phenolic compounds mainly associated with seed coats, bark, and some outer protective tissues, where they act as anti‑herbivory and anti‑microbial agents.
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While phenolic acids and related antioxidants occur in the aleurone, tannins are not the major or most abundant component of the aleurone layer of wheat seeds, so this option is incorrect.
Option B: Starch
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The bulk of starch in a cereal grain is stored in the starchy endosperm, where large starch granules fill most of the cell volume.
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Aleurone cells are characteristically non‑starchy; they lack starch granules and instead contain protein bodies and a thick cell wall, so starch is not the most abundant substance in this layer.
Option C: Protein (Correct)
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The aleurone layer is especially rich in storage proteins, often present as protein bodies or aleurone grains, and plays a key role in synthesizing and secreting hydrolytic enzymes during germination.
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In standard botany and NEET/board exam references, the aleurone layer of cereals such as wheat and maize is consistently described as protein‑rich, making protein the correct and most abundant constituent among the given choices.
Option D: Lipid
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Lipids and oils are important reserves in many seeds (for example, in oilseeds like mustard, groundnut, castor), and some lipids are present in aleurone cells as part of membranes and storage bodies.
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However, in wheat aleurone, lipids are not the main or most abundant reserve when compared with protein; thus, lipid is not the best answer for this MCQ.
Key Points for Exam and SEO
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The aleurone layer is one cell thick, located at the outermost part of the endosperm in cereals like wheat and maize.
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It is rich in proteins, minerals, vitamins, dietary fibre and bioactive compounds, and lacks starch granules that dominate the starchy endosperm.
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For MCQs asking “The aleurone layer is especially rich in…”, the standard correct choice is Protein.
