Types of plastids, Biology

TYPES OF PLASTIDS

(1) LEUCOPLASTS

These are present in ground parts of plants, internal parts of herbaceous stems and deep tissues of plants where sun light is not available.

Devoid of pigments and internal lamellar structures.

On the basis of function of leucoplast i.e. food storage, they are divided into three types - (i) Amyloplasts - Leucoplast storing starch.

(ii) Aleuroplasts - Leucoplast storing Proteins.

(iii) Elaioplasts - Leucoplast storing Oil, droplets and fats.

(2) CHROMOPLASTS

These are coloured plastid, responsible for colour of flowers, fruits and algae.

In algae brown colour due to phaeoplast and red colour due to rhodoplast. Phaeoplast contains pheucoxanthine and rhodoplast contains phycoerythrine.

Chromoplast contain different types of pigments (carotenes, Xanthophylls etc) Chlorophylls either absent or occur in very less amount.

Chromoplasts occurs mainly in pericarp and petals. In flowers chromoplast helps in pollination and in fruits these plastids help in dispersion of seeds because different colour attracts insects and birds.

Red colour of red chillies and red tomatoes is due to a red pigment of chromoplasts, "Lycopene". Lycopene is a type of carotene. Yellowish - orange colours of fruits are due to a-carotene, b-carotene and g-carotene. b-carotene is precursor of vitamin-A. Richest source of b- carotene are carrot roots.

Choromoplasts also occur in petals but colours of petals are mainly due to water soluble pigments which occur in cell sap. e.g. Anthocyanin - Blue or violet or red pigment; Anthoclor pigment responsible for yellow colour.

(3) CHLOROPLASTS

Schimper (1883) coined the term chloroplastid for green plastids.

Mayer called them Autoplast. Chloroplast name proposed by Erera.

Posted Date: 10/5/2012 7:27:22 AM | Location : United States







Related Discussions:- Types of plastids, Assignment Help, Ask Question on Types of plastids, Get Answer, Expert's Help, Types of plastids Discussions

Write discussion on Types of plastids
Your posts are moderated
Related Questions
Define Drug metabolism (Poly-pharmacy)? As older persons are sometimes prescribed number of medications, care is to be taken, as there is reduction in renal and hepatic clearan

In the eukaryotes replication of chromosomal DNA happens only in the S phase of the cell cycle. As for bacterial DNA, eukaryotic DNA is replicated     figure: The euk

Q. Food texture and Gas formers? Food texture: Recent studies indicate that strict omission of fibre is of no help on a peptic ulcer patient. The recurrence of peptic ulcer was

What is Metabolism ? Metabolism is usually defined as the sum of the chemical processes required to sustain life. These processes, called metabolic pathways, are catalyzed by

R a d i o g r a p h y: Radiograph or X-ray remains the most well-known and primary diagnostic tool of all the imaging modalities. It works b

>>>>Write a short note on the following- Question 1 Centrism in Bioethics Question 2 Bio Safety check list Question 3 Enforcement of IPRs Question 4 T

Q. What are the cnidocytes? What is the name of the capsule inside the cnidocyte? What are the biological functions of this structure? Cnidocytes are specific cells present in

Classification of Phytoestrogens? Phytoestrogens can be divided into 3 main classes: - Isoflavones, - Coumestans and - Lignans. All are diphenolic compounds with st

What are the adaptions flatworms neeed in order to live in their environment?

As a result of DNA replication two DNA molecules come into existence. Why is it not correct to assert that two "new" DNA molecules are created? What is the name given to the proces