Colourless plastids are known as Leucoplasts

Leucoplasts are a type of plastid that are colorless and lack pigments. They are primarily involved in the storage of starch, lipids, proteins, and other macromolecules. Leucoplasts are found in non-photosynthetic tissues of plants, such as roots, tubers, and seeds.

Types of Leucoplasts:
There are three main types of leucoplasts, each with a specific function:

1. Amyloplasts:
Amyloplasts, also known as starch grains, store starch in plants. They are commonly found in storage organs such as roots, tubers, and seeds. Amyloplasts are responsible for converting excess sugars into starch, which can be stored and used as an energy source for the plant.

2. Proteinoplasts:
Proteinoplasts, as the name suggests, are involved in the synthesis and storage of proteins. They are found in seeds, fruits, and other protein-rich tissues. Proteinoplasts play a crucial role in the development and germination of seeds, as well as in the accumulation of proteins during fruit ripening.

3. Elaioplasts:
Elaioplasts are responsible for the synthesis and storage of lipids, particularly oils and fats. They are found in oil-rich tissues such as seeds, fruits, and some roots. Elaioplasts are involved in lipid metabolism and can store large amounts of oils for energy reserves.

Function of Leucoplasts:
Leucoplasts are essential for the growth, development, and survival of plants. They perform various functions, including:

1. Storage: Leucoplasts store essential macromolecules such as starch, proteins, and lipids, which can be utilized by the plant during times of growth or energy requirement.

2. Synthesis: Some leucoplasts, such as proteinoplasts and elaioplasts, are involved in the synthesis of proteins and lipids, respectively. These synthesized molecules are crucial for the growth and development of the plant.

3. Conversion: Leucoplasts can convert excess sugars into starch, which is then stored for future use. This helps regulate sugar levels in the plant and provides an energy reserve.

4. Germination and Fruit Ripening: Leucoplasts, particularly proteinoplasts, play a vital role in the germination of seeds and the accumulation of proteins during fruit ripening.

In conclusion, colourless plastids are known as leucoplasts. They are involved in the storage and synthesis of various macromolecules and play a crucial role in the growth and development of plants.

The chloroplast is a type of plastid which produces green coloured pigment. The chloroplast is involved in carrying out photosynthesis. It gives a green colour to leaves.