Study Guide · Biology

PPLO Full Form and Where are Plastids Found?

In Cell Biology (Class 9 & 11), we study the fundamental units of life and their organelles. Let's cover two very common exam questions regarding the smallest cell in the world and the location of plastids.

Question (Click to Flip)

What is the full form of PPLO in biology?

Answer

In Biology, PPLO stands for Pleuropneumonia-Like Organisms. It is another name for Mycoplasma, which is the smallest living cell known.

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Key Facts

PPLO: Pleuropneumonia-Like Organisms (Also known as Mycoplasma).

PPLO Fact: It is the smallest living cell and has no cell wall.

Plastids Location: Found exclusively in Plant cells and algae; absent in Animal cells.

1. PPLO Full Form (The Smallest Cell)

The smallest known living cell in the world is the Mycoplasma bacteria. In older biology textbooks, it is frequently referred to by its abbreviation, PPLO.

Full Form: PPLO stands for Pleuropneumonia-Like Organisms.
Why this name?: It was first isolated from the fluid of cattle that were suffering from a severe lung disease called pleuropneumonia.
Key Fact: Mycoplasma (PPLO) are completely naturally resistant to many common antibiotics (like penicillin) because they completely lack a cell wall.

2. Plastids are found in which cell?

Plastids are large, double-membrane cell organelles.

Location: Plastids are found ONLY in Plant Cells and in some algae (like Euglena).
Fact: They are absolutely absent in animal cells.
Function: The most famous type of plastid is the Chloroplast, which contains the green pigment chlorophyll. Without plastids, plants would not be able to perform photosynthesis and make their own food.

Questions and Answers

What is the full form of PPLO in biology?+

In Biology, PPLO stands for Pleuropneumonia-Like Organisms. It is another name for Mycoplasma, which is the smallest living cell known.

Plastids are found in which type of cell?+

Plastids are cell organelles found exclusively in Plant cells and certain algae. They are completely absent in animal cells.

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