Web making in spiders

Spiders make silk in a special part of their body called a gland and use their legs to pull it out of their bodies. This is called spinning.

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Thallophyta

Largest group of plant kingdom.

not differentiated into stem, leaves and roots and no distinctive tissue systems.

mostly aquatic plants and found both in fresh and marine water due to absent of "true roots" and vascular tissue.

cell wall composed of cellulose around their cells.

Ex- Algae, Fungi and Lichens

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Algae

Chlorophyll bearing thallophytes

Autotrophic mode of Nutrition

Ex- Chlorella, Chlamydomonas, Cladospora, Sargassum, Gelidium, Laminaria

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Algae

Largest producer of Carbohydrates 

some forms edible like Ulva (sea lettuce)

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Algae

They exist as-

Microscopic Unicellular- Chlamydomonas

Colonial Forms- Volvox 

filamentous forms- Ulothrix and Spirogyra

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Reproduction

Vegetative reproduction-   by fragmentation

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Reproduction

Asexual reproduction-  by spore formation (zoospores)