Drought-water stress and adaptations, Biology

Assignment Help:

Drought

Drought refers to a condition of water shortage and it can result from many reasons. Frequently less than the normal rainfall is a common cause of drought. Less than 75% of normal rainfall may be defined as drought. We may, however, bear in mind that not only the total rainfall but its distribution in time is vitally important for crops. Small deficit (or surplus) in rain is not necessarily directly related to agricultural productivity. A severe drought reduces stream flow and recharging of aquifer. This results in lowering of water. table, loss of agricultural crops, wild life and aquatic life. Water level in lakes, streams and reservoirs drops due to failure of rains. As a result crop yield and fodder production suffer adversely resulting in food scarcity and human discomfort, and stress to livestock. The incidence of forest fue increases and overall conditions become difficult.

Due to the pressure of growing population over-exploitation of water resources has become a universal feature. Consumption of bsh water is due to rapidly growing urbanisation, industrialisation and mechanised agriculture which leads to over-exploitation of water resources. over-expioitation of fresh water resources can create severe limitation to growth and development. Excessive withdrawal of ground water in coastal areas  has resulted in salt water intrusion into the aquifers . Consequently, the ground water has become unfit for human consumption and agriculture on account of high salinity. Ponds, bogs and streams are sites where ground water appears at the land surface. Excessive withdrawal of ground water and overdrawing of ground water lower the water-table as well as the level of water in lakes and streams and may completely dry them up.


Related Discussions:- Drought-water stress and adaptations

What is conventional breeding, What is Conventional breeding Conventio...

What is Conventional breeding Conventional breeding is a process in which genes for pesticidal traits are introduced into a plant by natural methods, such as cross-pollination

Describe the procedure of femoral approach, Q. Describe the procedure of fe...

Q. Describe the procedure of femoral approach? The catheter is inserted into the femoral sheath and advanced to the level of the left mainstem bronchus over the guidewire. Aft

Foods to be avoided during thyphoid, Foods to be avoided are: High fibr...

Foods to be avoided are: High fibre foods like whole grain cereals and  their products (e.g. whole wheat flour, cracked wheat, whole pulses) Raw vegetables and fruits Fri

Conditions necessary for outbreak of staphylococcal food, Q. Conditions Nec...

Q. Conditions Necessary for Outbreak of staphylococcal food? The following conditions are necessary for an outbreak of staphylococcal food poisoning: 1. The food must conta

Mollusca, how mollusca bore into hard substrate

how mollusca bore into hard substrate

Enzymes, what is the composition of enzymes ?

what is the composition of enzymes ?

Define dark field microscope, Define Dark Field Microscope In this micr...

Define Dark Field Microscope In this microscope, condenser system is modified, so that only reflected and refracted light by specimen forms an image. Here, the object is bright

In vitro studies - nutrition of embryo, In vitro Studies - Nutrition of Emb...

In vitro Studies - Nutrition of Embryo Studies involving culture of embryos excised of various stages of development (i.e., early globular proembryo, late globular proembryo o

Cornea - organogenesis of eye and limb, Cornea - Organogenesis of Eye a...

Cornea - Organogenesis of Eye and Limb The fully formed cornea contains 2-cell layered epithelium and the stroma made of extra cellular secreted materials. The bulk of the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd