Question

Which of the following statements is NOT true about Plastids?

• A. Starch, oils and protein granules are stored in chromoplasts.
• B. They have their own ribosomes.
• C. They have their own DNA.
• D. Stroma is found in chloroplast.

Answer 1

Answer:

A. Starch, oils and protein granules are stored in chromoplasts.

Plastids

Types of Plastids and Their Functions:

• Plastids are double-membraned organelles found in plant cells and eukaryotic algae.

• They are responsible for manufacturing and storing food.

• Plastids contain pigments, which determine the color of plant cells.

Detailed Breakdown of Plastid Types:

• Chloroplasts:

  • Contain chlorophyll and carotenoid pigments.

  • Primary site of photosynthesis, converting light energy into chemical energy (sugars).

  • Responsible for the green color of leaves and stems.

• Chromoplasts:

  • Contain carotenoid pigments (carotenes and xanthophylls).

  • Responsible for the yellow, orange, and red colors of flowers, fruits, and roots.

  • Important Note: Chromoplasts are involved in storing pigments, not primarily in storing starch, oils, or protein granules. These storage functions are typically associated with other plastid types or cellular structures.

• Leucoplasts:

  • Non-pigmented plastids.

  • Serve as storage depots for various nutrients.

  • Subtypes include:

    • Amyloplasts: Store starch (a common storage carbohydrate in plants).

    • Elaioplasts: Store oils and fats.

    • Aleuroneplast: Store proteins.