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Which one of the following statements is correct?

1. The seed in grasses is not endospermic.
2. Mango is a parthenocarpic fruit.
3. A proteinaceous aleurone layer is present in maize grain.
4. A sterile pistil is called a staminode.

Correct answer: A proteinaceous aleurone layer is present in maize grain.

Solution

Maize grain has an outer aleurone layer that is rich in protein and surrounds the endosperm. The other statements are incorrect: grasses generally have endospermic seeds, mango is not parthenocarpic, and a sterile pistil is called a pistillode, not a staminode.

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