Question

Write characteristics of : (50-100 words)

1. Monera
2. Fungi
3. Protista

Answer 1

1) MONERA:

• They are typically unicellular organisms (but one group is mycelial). The genetic material in these organisms is the naked circular DNA. A nuclear envelope is absent. Both, ribosomes and simple chromatophores, are the only subcellular organelles in the cytoplasm.
• Sap vacuoles do not occur. Instead, gas vacuole may be present.
• The predominant mode of nutrition is absorptive but some groups are photosynthetic (holophytic) and chemosynthetic.
• The organisms are non-motile or move by the beating of simple flagella or by gliding.

2) FUNGI.

• Most fungi grow as tubular filaments called hyphae. An interwoven mass of hyphae is called a mycelium.
• The walls of hyphae are often strengthened with chitin, a polymer of N-acetylglucosamine.
• Fungi disperse themselves by releasing spores, usually windblown.
• Fungi are heterotrophic.

3) PROTISTA.

• They are eukaryyotic, which means they have a nucleus.
• Most have ,mitochindria.
• They have parasites.
• They all prefer aquatic or moist enviroments.