Question

.Give the characteristics of Kingdom Monera with examples.

Answer 1

ANSWÈR:-

General characteristics of Kingdom Monera:

i. Size: The organisms included in this kingdom are microscopic, unicellular and prokaryotic.

ii. Nucleus: The organisms possess a primitive (prokaryotic) type of nucleus, i.e. nucleus is without nuclear envelope, nucleolus, nucleoplasm, histone proteins and true chromosomes. Such nucleus is also called as nucleoid.

iii. Cell wall: The cell wall is composed of peptidoglycan.

iv. Membrane bound cell organelles: The cells do not possess membrane-bound cell organelles like chloroplasts, mitochondria, etc.

v. Locomotion: The organisms are either motile or non-motile.

The locomotion is due to gliding movements or due to flagella.

vi. Nutrition: The organisms may be autotrophic, heterotrophic, parasitic or saprophytic in nutrition.

The autotrophs are either photoautotrophs or chemoautotrophs.

vii. Reproduction: The mode of reproduction in Monera is asexual, either by fission or budding.

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Examples:

• Archaebacteria. e.g. Methanobacillus, Thiobacillus, etc.
• Eubacteria. e.g. Rhizobium, Clostridium, etc.
• Cyanobacteria. e.g. Nostoc, Anabaena, etc.
• Actinomycetes. e.g. Streptomyces, Mycobacterium, etc.

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Answer 2

Explanation:

1. The Monerans are unicellular organisms.

2. They contain 70S ribosomes.

3.The DNA is naked and is not bound by a nuclear membrane.

4.It lacks organelles like mitochondria, lysosomes, plastids, Golgi bodies, endoplasmic reticulum, centrosome, etc.

For example: bacteria, blue-green algae, Mycoplasma, etc.