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2021-08-02 19:45:09 Transportation in Plants

The plants have low energy needs, as they use relatively slow transport systems.
Plant transport systems move energy from leaves and raw materials from roots to all their parts.
The xylem (tissue) moves water and minerals obtained from the soil to all other parts of the plants.
The phloem (tissue) transports products of photosynthesis from the leaves (where they are synthesized) to other parts of the plant.


Movement of Water in Plants
Water moves into the root from the soil and then steady it moves into the root xylem, creating a column of water, which is progressively pushed upwards.
Evaporation of water molecules from the cells of a leaf (see the image given above) creates a suction process, which pulls water from the xylem cells of roots; this process keeps going on.
The loss of water in the form of vapor from the leaves (i.e. aerial parts) of the plant is known as transpiration.
Transpiration, likewise, helps in the absorption and upward movement of water and minerals dissolved in it from roots to the leaves.
Transpiration also helps in the temperature regulation (in plants).
The transport of soluble products of photosynthesis is known as translocation, which occurs in the part of the vascular tissue known as phloem.
Along with photosynthesis products, the phloem also transports amino acids and other substances, which are ultimately delivered to roots, fruits, seeds, and to growing organs. Open / Comment

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2021-08-02 17:54:35

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2021-08-02 16:10:22 Important Points For NEET

Evidences from comparative morphology and anatomy :-

Examples of homologous organs:

(i) Forelimbs of mammals
(ii) Thorn of Bougainvillea and tendril of Cucurbita both are modification of axillary bud.
(iii)Vertebrate hearts or brains
(iv)Mouth parts of insects :
Cockroach Honey bee Mosquito
(Biting & chewing) (Chewing & lapping) (Piercing & Sucking)
(v) Testes in male and ovaries in female
(vi) Potato and Ginger - both are modified shoot
(vii) Radish and Carrot - both are modified roots

Examples of Analogous organs :

(i) Wings of butterfly and birds
(ii) Eye of the octopus and of mammals
(iii) Flippers of Penguins and Dolphins
(iv) Sweet potato (root modification) and potato (stem modification)
(v) Sting of bee and scorpion
(vi) Chloragogen cells of earthworm and liver of vertebrates. Open / Comment

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2021-08-02 12:52:17

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2021-07-31 19:01:48 BORON:
•In casting of copper as a dioxidizer
•Boron rods used in automic reactor.
•Boron fiber used in bullet proof jacket,
•In composite material of aircraft
•Used in braintumer therapy.

BORAX:
•As a flux for soldring metal.
•In borex bead test
•In softning of water
•Antiseptic
•Manufacturing of enamels of glazes, tiles.
•For making optical and borosilicals SS.
•Food preservative

ALUMINIUM:
• Making house hold, untensils, frames, roof,aircrafts.
• Electric wire.
•Thermite process (In metallurgy of Cr, Mn, Fe)
•For transportin nitric acid.
•AI, Hg used as reducing agent.
•Aluminium powder + Ammonium nitrate.

LEAD [Pb]:
•In making telegraph and telephone wires
•Making bullets
•Making chamber in HSO, process.

NITROGEN:
•In the manufacturing of HNO3, NH3, CaCN2.
•Liquid nitrogen used as refrigrant.
•Inert atmosphere in metallurgy.
•Gas thermometer and electrical bulb

NH3:
• Refrigeration
•Manufacturing HNO3, NaHCO3
•Artificial Silk.
• Urea Formation
•For solvent

HNO3:
• Manufacturing of ammonium nitrateas fertilizer.
•In explosive
• For making nitroglycerine.
• Making TNT.
• Pickling against of stainless steel.
• Etching of Metal
•Oxidizer in rocket fule. Open / Comment

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