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Water harvesting is an age-old concept in India | Grade 10

They are called as: Khadins, tanks and nadis in Rajasthan, Bandharas and tals in Maharashtra, Bundhis in Madhya Pradesh and Uttar Pradesh, ahars and pynes in Bihar, Kulhs in Himachal Pradesh, Ponds in the Kandi belt of Jammu region, and Eris (tanks) in Tamil Nadu, Surangams in Kerala, and Kattas Read more…

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Phylum Annelida | Class IX

Salient features : Annelids (L., annulus = ring; Gr. lidos = form) are generally, free-living (leeches attach themselves to animals and feed by sucking), mostly aquatic (freshwater or marine), a few terrestrial or burrowing forms. Triploblastic, bilaterally symmetrical, elongated, cylindrical and vermiform. Body metamerically segmented, i.e., divisible into more or Read more…

Phylum Mollusca | Class IX

Phylum: Mollusca (L., molluscus — soft) (i) This phylum is made up of over 150,000 diverse species. (ii) They are soft, unsegmented, bilaterally symmetrical and without appendages. (iii) Their body is divisible into an anterior head, a ventral muscular foot, a hard dorsal viceral mass. (iv) Mollusks have an external Read more…

Lichens | Class IX

Lichens are called compound plants as algae and fungi live togather in close association, as a result of which both are benefitted. Alga prepares the food for both the partners, while fungal hyphae provide protection to algal partner. This relationship is called symbiosis.They occur as greyish green growths on rocks, Read more…