Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Symbiotic Nitrogen Fixers - Nutrient Cycles
Of the symbiotic nitrogen fixing bacteria, species of Rhizobium form root nodules in legumes and are the most studied nitrogen fixers and the best understood. Species of Rhizobium are most specific to particular species of legumes. The rhizobia penetrate the root hair and once inside the root, the bacteria rapidly multiply and form swollen, irregular - shaped bodies in roots of legumes. Some non-legume w6ody plants also have root nodules and fix nitrogen symbiotically.
The organisms that cause the formation of nodule and fixation of nitrogen are actinomycetes (a kind of primitive fungus). Some examples of non-legumes are species of Alnus, Elaeagnus Myrica, Araucaria, Ginkgo, and Casuarina. Unlike legumes, which are largely tropical in origin, these nitrogen fixers originate in the temperate zone. Nitrogen fixation by blue green algae or cyanobacteria may take place in free living forms or in symbiosis with fungi as in certain lichens, mosses ferns and at least one seed plant. The fronds of the small free floating aquatic fern Azolla contain small pores filled with symbiotic blue green algae Anabaena that actively fix nitrogen. For centuries this fern has played an important role in the rice fields of China. Before the rice fields are planted the water filled paddy fields are covered with the aquatic fern which fixes enough nitrogen for the crop as it matures. This practice permits rice to be grown without further addition of nitrogen fertilisers. Symbiotic nitrogen fixers are more efficient than free living ones.
Q. What is ST segment depression at rest? ST- segment depression has become severe, that is, 3 to 4mm or more in vigorous asymptomatic subjects. If the patient is known to have
What morphological structure is responsible for bacterial motility?
Q. Indicating the name and respective ploidy of each involved cell how can the formation of egg cells from germ cells be described? The formation of egg cells begins with a ger
What are ganglia? Ganglia (singular ganglion), or neural ganglia, are structures located outside the central nervous system (for instance, beside the spinal column or near visc
What is aves?
Success which signifies Optimum Health The features or clinical conditions which are representative of this group are: i) No pain or tenderness in the implant upon function.
What is the General Cognitive Ability General cognitive ability is usually assessed using standardised intelligence tests, such as Wechsler Intelligence Scale for Children Thir
CLASSIFICATION OF GENERAL DRUGS - 1 . NATURAL DRUGS - Obtained from natural sources as minerals, animals, plants & microorganism. (i) Minerals - It include
Ask questionLIMITATION OF ECOLOGICAL PYRAMIDS #Minimum 100 words accepted#
SPINAL CORD (MYELON) It is part of CNS. 45 cm long (in woman 43 cm) & weight 35 gms. Origi n from lower part of medulla oblongeta. Shape - Long cylindrical,
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd