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Home » Class 9 » The fundamental unit of life:cell » Plastids

Plastids

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 2 Comments

Question 1 What are the main functions of plastids?

Question 2 What are the major categories of plastids?

Question 3 Name the plastic which is green in colour and involved in photosynthesis?

Question 4 Why plastids are called as kitchen of cell?

Question 5 Describe the two membranes of plastids?

Plastids
They are present in plant cell but absent in animal cell.
They have their own DNA and Ribosomes.They have a power to divide.

Types:

1)Chromoplast(coloured except green colour)
2)Chloroplast(green colour)
3)Leucoplast(colourless)
They are involved in photosynthesis because they have green pigment called chlorophyll.They are called as kitchen of cell.

structure of chloroplast
Each chloroplast is surrounded by 2 membranes.It has 2 regions:

1)Grana(site of light reaction):It is a stack of membrane bounded,flattened discoid sac containing the molecules of chlorophyll.
2)Stroma(site of dark reaction):Homogeneous matrix in which grana are embedded.They contain photosynthetic enzymes,DNA,ribosomes.

Functions

1)They trap solar energy and utilise it to manufacture food for plant.
2)Chromoplast impart green colour to flowers.
3)They store food in form of carbohydrates,fats and proteins.

Filed Under: Class 9, The fundamental unit of life:cell Tagged With: chloroplast, chromoplast, functions of plastids, grana, kitchen of cell, plastids, stroma, types of plastids

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. Nancy says

    June 18, 2018 at 12:15 pm

    mam my question is : some plaids r colourless but still they r important why??

    Reply
    • Mrs Shilpi Nagpal says

      June 20, 2018 at 6:15 am

      Hello Nancy, plastids are still very important because they serve various functions like storage of starch, lipids and protein.

      Reply

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