When germinated seeds are kept in dark,the proplastid differentiate into etioplasts which contain semicrystalline tubular arrays of membrane known as

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Question

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HPSC Assistant Professor 2018 Botany (Official Paper)

Answer 1

The correct answer is Prolamellar bodies

Concept:

When germinated seeds are kept in the dark, the proplastids (precursors of plastids) differentiate into etioplasts. Etioplasts are a type of plastid found in plants grown in the absence of light.
Etioplasts contain semicrystalline tubular arrays of membranes known as prolamellar bodies. These structures are crucial for the transformation of etioplasts into chloroplasts upon exposure to light.

Explanation:

Prolamellar bodies: These are the semicrystalline tubular arrays of membranes found within etioplasts. They play a key role in the biosynthesis of chlorophyll and the development of thylakoid membranes when plants are exposed to light. This transformation is essential for the plant to perform photosynthesis.

Other Options:

Stromules: These are stroma-filled tubules that extend from the surface of plastids. They are involved in the exchange of metabolites and signaling between plastids and other organelles but are not related to the prolamellar bodies in etioplasts.
Stroma lamellae: These are structures found within chloroplasts, not etioplasts. They are part of the thylakoid membrane system and are involved in the light reactions of photosynthesis.