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Consider the following statements regarding Plastids: 1. They are present in all living organisms. 2. Leucoplasts are primarily organelles in which materials such as starch, oils and protein granules are stored. 3. They are self-replicating. 4. They are broadly classified into two types. Which of the statements given above are correct?

Consider the following statements regarding Plastids: 1. They are present in all living organisms. 2. Leucoplasts are primarily organelles in which materials such as starch, oils and protein granules are stored. 3. They are self-replicating. 4. They are broadly classified into two types. Which of the statements given above are correct? Correct Answer 2, 3 and 4 only

The correct answer is 2, 3 and 4 only.

Key Points

  • Plastids are a group of phylogenetically and physiologically-related organelles found in all types of plants and algae. Hence statement 1 is not correct.
  • Different types of plastids contribute to plant metabolism thus promoting plant growth and development.
  • They have a double membrane.
  • There are several small coloured bodies in the cytoplasm of the cells of Tradescantia leaf.
  • They are scattered in the cytoplasm of the leaf cells.
  • They are self-replicating. Hence statement 3 is correct.
  • They are of different colours. Some of them contain a green pigment called chlorophyll.
  • Green coloured plastids are called chloroplasts.
    • They provide green colour to the leaves.
    • Chloroplasts are important for photosynthesis in plants.
    • Chloroplasts also contain various yellow or orange pigments in addition to chlorophyll.
  • Plastids are present only in plant cells.
  • There are two types of plastids: chromoplasts (coloured plastids) and leucoplasts (white or colourless plastids). Hence statement 4 is correct.
  • Leucoplasts are primarily organelles in which materials such as starch, oils and protein granules are stored. Hence statement 2 is correct.
  • The internal organization of the plastids consists of numerous membrane layers embedded in a material called the stroma.
  • Plastids are similar to mitochondria in external structure.
  • Plastids also have their own DNA and Ribosomes.

Related Questions

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