Question

Review
Draw a labelled diagram of Nucleus. .(Students can
search internet for clear diagrams to be drawn).
Distinguish between different types of plastids.
Describe structure and functions of mitochondria. Draw
a labelled diagram of mitochondria also.
Answer fast to be marked as brilliant ​

Answer 1

Diagram of nucleus & mitochondria ☝

Types of plastids:-

•chloroplasts- Chloroplasts are biconvex shaped, semi-porous, double membraned, cell organelle found within the mesophyll of the plant cell. They are the sites for synthesizing food by the process of photosynthesis.

•chromoplasts- Chromoplasts is the name given to an area for all the pigments to be kept and synthesized in the plant. These can be usually found in flowering plants, ageing leaves and fruits. Chloroplasts convert into chromoplasts. Chromoplasts have carotenoid pigments that allow different colours that you see in leaves and fruits. The main reason for its different colour is for attracting pollinators

•leucoplasts- These are the non-pigmented organelles which are colourless. Leucoplasts are usually found in most of the non-photosynthetic parts of the plant like roots. They act as a storage sheds for starches, lipids, and proteins depending on the need of the plants. They are mostly used for converting amino acids and fatty acids.

Structure of mitochondria:

• The mitochondrion is a double-membraned, rod-shaped structure found in both plant and animal cell.
• Its size ranges from 0.5 to 1.0 micrometre in diameter.
• The structure comprises an outer membrane, an inner membrane, and a gel-like material called the matrix.
• The outer membrane and the inner membrane are made of proteins and phospholipid layers separated by the intermembrane space.
• The outer membrane covers the surface of the mitochondrion and has a large number of special proteins known as porins.

Function of mitochondria:

1. Regulates the metabolic activity of the cell
2. Promotes the growth of new cells and cell multiplication
3. Helps in detoxifying ammonia in the liver cells
4. Plays an important role in apoptosis or programmed cell death
5. Responsible for building certain parts of the blood and various hormones like testosterone and oestrogen
6. Helps in maintaining an adequate concentration of calcium ions within the compartments of the cell

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Answer 2

Answer:

I've given the explanation of mitochondria

Explanation:

sorry for the inconvenience of this photos