PARTS OF PLANTS-ROOTS.

ROOTS ARE THE UNDERGROUND PART OF PLANTS.They have three main functions .First,they anchor the plant in the soil.Second , they absorb water and minerals from the space between soil particles ;the roots' absorptive properties are increased by root hair ,which grows behind the root tips , allowing maximum uptake of vital substances .Third , the root is the part of the plant's transport system :xylem carries water and minerals from the root to the stem and leaves,and phloem carries nutrients from the leaves to all parts of the root system.In addition , some roots (e.g carrots)are food stores.Roots have an outer epidermis covering a cortex of parenchyma(packing tissue ) and a central cylinder of vascular tissue .This arrangement helps the roots resist the force of compression as they grow through the soil.

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KEY BOARD SHORT CUTS

While surfing the Web, these commands could help you and are absolutely worth learning. By making repetitive motions faster, web surfing becomes so easy and pleasant! The following shortcuts can be work with desktop versions of Chrome, Firefox, and IE. CTRL-T to launch a new browser tab page. Tabbed pages are very useful: they let you open multiple web pages simultaneously without the same memory load as a full browser window. Simply press CTRL-T to launch a new tab. Related: use CTRL-Page Up and CTRL-Page Down to navigate between the tabs. CTRL-Enter to type 'www.' and '.com' Once you ...

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REVOLUTIONS-INDUSTRIAL AND INFORMATION

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