This document summarizes the different types of plastids found in plant cells. It discusses chloroplasts, which contain chlorophyll and are the site of photosynthesis; chromoplasts, which contain carotenoid pigments and are responsible for colors in fruits and vegetables; leucoplasts, which store starches, oils, or proteins and lack chlorophyll; amyloplasts, which store starches; elaioplasts, which store oils; and proteinoplasts, which contain crystalline protein bodies. The document also provides details on the structure of chloroplasts, which have an outer and inner membrane enclosing the stroma and thylakoid membranes.
Nucleus” is a Latin word meaning Kernel
It is the “CONTROL CENTER” of the cell
Average diameter of nucleus is 6um, which occupies around 10% of cell volume
Nuclear Envelope
Nuclear Pores and complex
Nuclear lamina
Chromosomes & Chromatin
Nucleolus
Nucleoplasm
Cytoplasm is a gel like fluid present between the plasma membrane and the nucleus
Cytoplasm is the semi-fluid substance of a cell that is present within the cellular membrane and surrounds the nuclear membrane
It is sometimes described as the nonnuclear content of the protoplasm
Nucleus” is a Latin word meaning Kernel
It is the “CONTROL CENTER” of the cell
Average diameter of nucleus is 6um, which occupies around 10% of cell volume
Nuclear Envelope
Nuclear Pores and complex
Nuclear lamina
Chromosomes & Chromatin
Nucleolus
Nucleoplasm
Cytoplasm is a gel like fluid present between the plasma membrane and the nucleus
Cytoplasm is the semi-fluid substance of a cell that is present within the cellular membrane and surrounds the nuclear membrane
It is sometimes described as the nonnuclear content of the protoplasm
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The plastid (Greek: πλαστός; plastós: formed, molded – plural plastids) is a major organelle found in the cells of plants and algae. Plastids are the site of manufacture and storage of important chemical compounds used by the cell. They often contain pigments used in photosynthesis, and the types of pigments present can change or determine the cell's colour. They possess a double-stranded DNA molecule, which is circular, like that of prokaryotes.
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5. INTRODUCTION
❖ THE PLASTID IS A MEMBRANE BOUND ORGANELLE
FOUND IN THE CELLS OF PLANTS, ALGAE AND SOME
OTHER EUKARYOTIC ORGANISM.
❖ PLASTIDS WERE DISCOVERED AND NAMED BY ERNST
HAECKEL BUT A.F.W. SCHIMPER WAS FIRST TO GIVE A
CLEAR DEFINITION.
❖ PLASTIDS ARE THE SITE OF MANUFACTURE AND
STORAGE OF IMPORTANT CHEMICAL COMPOUNDS
USED BY THE CELLS OF AUTOTROPHIC EUKARYOTES.
6. CHROMOPLASTS
❖ Chromoplasts are plastids, heterogeneous organelles
responsible for pigment synthesis and storage in specific
photosynthesis eukaryotes.
❖ The presence of carotenoid pigments makes them
colourful.
❖ Chromoplasts are formed from leucoplasts or
chloroplasts.
❖ Change of colour from green to reddish during the
ripening of tomato and chilli is due to transformation of
chloroplasts to chromoplasts. The orange colour of
carrot roots is due to chromoplasts.
7. ❖ They are the greenish plastids which possess
photosynthesis of food
❖ Majority of the chloroplasts of the green plants are
found in the mesophyll cells of the leaves. They vary in
size, shape and number.
❖ Size = they have variable thickness of 2-4 micrometer
and length of 5-10 micrometer.
❖ Shape = they may be spherical, lens shaped, oval,
discoid or even ribbon-shaped in some plants.
❖ Number = their number varies from 1 per cell in
chlamydomonas, a green alga to 20-40 per cell in the
mesophyll.
CHLOROPLASTS
9. ❖ Like mitochondria, chloroplasts are also double membrane-bound
organelle having outer and inner membrane. The inner membrane is
relatively less permeable to substances than outer membrane and thus,
has more proteins including carrier proteins. The space enclosed by the
inner membrane of the chloroplast is called the stroma. Stroma contains
a large number of organised flattened membranous sacs called
thylakoids which are arranged in the stacks like the piles of coins called
the grana or the integral thylakoids.
❖ The thylakoids of different grana are connected by flat membranous
tubules called the stroma lamellae. The membrane of the thylakoids
enclose a space called lumen
❖ The stroma of the chloroplasts contains enzymes required for the
synthesis of carbohydrates and proteins. It is also contains small,
double-stranded circular DNA molecules and ribosomes. The ribosomes
of the chloroplasts (70S) are smaller than the cytoplasmic ribosomes (80)
STRUCTURE OF CHLOROPLASTS
10. ❖ Photosynthesis = light reaction and dark reaction.
❖ Storage of starch.
Functions of Chloroplasts
11. ❖ They are the colourless plastids which generally occur
near the nucleus in non-green cells. They have variable
size, form and stored nutrients. Granum is absent.
❖ There are three types of leucoplasts:
➢ Amyloplasts : they are starch-containing leucoplasts,
e.g., potato tubers, rice
➢ Elaioplasts : they store fats and oils, e.g., castor
➢ Aleuroplasts : These leucoplast store proteins, eg.,
aleurone cells of maize.
LEUCOPLASTS
12. ❖ Proteinoplasts are specialised organelle found only in
plant cells.
❖ Proteinoplasts belong to a broad category of organelle
known as plastids because they lack pigments,
proteinoplasts are specifically a kind of leucoplasts.
❖ They contain crystalline bodies of protein and can be the
sites of enzymes activity involving those proteins.
PROTEINOPLASTS