Science [1 Mark Questions]

Use of microbes to protect crops is called biocontrol.
Example : Trichoderma (fungi) protects plant roots from pathogens.

Chlorophylls, fucoxanthin (brown), xanthophylls (yellow), phycoerythrin (red) phycocyanin (blue).

It respires anaerobically and has an enzyme called zymase to bring about fermentation.

Bacteria that live in harsh environment use chemicals (Ammonia, hydrogen sulphide) to produce their food instead of utilizing energy from the sun. This process is called chemosynthesis.

The nuclear content of a bacterial cell lacks nuclear membrane. So it is called nucleoid.

Extra chromosomal DNA present in bacteria is called plasmid.

Disease-causing organisms are called pathogens. Example: The bacterium Mycobacterium tuberculosis causes tuberculosis in human beings.

Small pox, polio, measles, mumps, rubella, tuberculosis.

Alexander Flemming.

Acetobacter aceti.

Rhizobium.