2019 Datesheet for CBSE Board Exam: Class X and Class XII

Datesheet 2019

Datesheet informing the dates of board examination 2019 of various subjects to be conducted for CBSE are out. Know more here and learn how to prepare for the board examination.

Biogeochemical Cycles

Biogeochemical Cycles

A biogeochemical cycle is a pathway by which a chemical substance moves through biotic (living world) and abiotic (lithosphere, atmosphere, and hydrosphere – non-living) components of Earth. Such cyclic flow involves the transfer of matter and energy between the different components of the biosphere.

Classification in Plants

Classification in Plants

First level of classification among plants depends on whether the plant body possesses well-differentiated distinct cellular components or not. Next level is based on the presence or absence of special vascular tissues for the transport of water and other substances. Further classification takes into account the ability to bear seeds and whether seeds are enclosed within the fruits or not.

Depending on these characteristics, kingdom-Plantae is divided as of Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms.

Sources of Energy

A good source of energy would be one with (i) A large amount of work per unit volume or mass; (ii) easily accessible; (iii) easy to store and transport; and (iv) economical.

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