Which of the following is not a symptom of nitrogen deficiency?
Necrosis is a symptom of deficiency of Ca, Mg, Cu, K.
Minerals absorbed by roots move to the leaf through
Along with water, minerals move upwards through the tracheary elements of xylem.
Micronutrients are
They are required in less quantities but are as important as macronutrients in nutrition.
Mycorrhiza is a symbiotic relationship between roots of higher plant and
Symbiotic relationship between roots of higher plants and fungi is called mycorrhiza ,e.g.pinus root associated with fungal hyphae.
Which one the following is absorbed from the soil?
Carbon and oxygen are absorbed from the atmosphere while hydrogen is obtained from water.
Nitrifying bacteria
The ntririfying bacteria bring about transformation of ammonia to nitrite and of nitrite to nitrite.
Which ion is essential for maintaining cell membrane permeabilitry?
Ca is needed for cell membrane permeability.
Which of the following can fix atmospheric nitrogen ?
Anabaena is nitrogen fixing blue green alga compossed of barrel shaped cells held in a gelatinous matrix, so it can fix at atmospheric nitrogen.
The function of leghaemoglobin in the root nodules of legumes is
Leghaemoglobin is the haemoglobin like red pigment found in root noduels of legumes and reported to function as an oxygen-carrying pigment in symbiotic nitrogen fixation
Which one of the following elements in plants is not remobilised ?
Calcium is not remobilized from the leaves to the fruit, like potassium,phosphorus and sulphur.
Which of following is not caused by deficiency of mineral nutrition?
Etiolation is a plant response to stimuli. When plants seed are grown in insufficient light, either in partial or complete absence of light,the seedling will have long,weak stem,smaller and fewer leaves because of longer internodes, and a pale yellow or bleached white, chlorotic colour due to lack of clorophyll .The plant increases in height help to reach a possible source of light faster.
Plants absorb nitrogen in the form of
Ammonia is first converted into nitrites and nitrates, and then nitrate is absorbed by the plants.
Active uptake of minerals depend upon
Active uptake of minerals depends upon dephosphorylation.
Importance of micro-elements was recognized late due to
Importance of micro elements was recognized late due to their presence as contaminants in macronutrients.
Inhibition of cell division is caused by
Lack or low level of N,K,S, Mo causes inhibition in cell division.
Which is the main aminoacid involved in the process of transamination?
It is the main aminoacid from which the transfer of amino group takes place and other aminoacids are formed during Transamination.
Manganese is required in
Manganse is essential for many plants functions. Some of them are :The assimillation of carbon dioxide in photosynthesis. It is involved in the Hill reaction, where water is split during photosynthesis.It helps in the synthesis of chlorophyll and in nitrate assimilation .Manganese activates fat forming enzymes.It helps in the formation of riboflavin ,ascorbic acid ,and carotene.It function in electron transport during photosynthesis.
A plant that manufactures its own food is
Autotroph are green plant capable of synthesizing their own food from raw material (CO2 water and sunlight.)Thus they are independent and self nourishing.
The process of Ca uptake in translocation is inhibited by
Mn inhibits Ca translocation in shoot apex.
For chlorophyll formation a plant needs
For Chlorophyll formation a plant need Fe, Mg & light
Which of following is a free living aerobic nonphotosynthetic nitrogen-fixer?
Rhizobium is a symbiotic nitrogen fixer. Azospirillum is a fungus and Nostoc is anaerobic.
Which one is an essential minerals,not constituent of any enzyme but stimulates the activity of many enzymes?
Potassium is not a consitutent of any enzyme but is an activator of enzymes. Potassium is an essential minerals and is found in more amount in actively dividing cell such as of buds young leaves root tips, etc.it has some other roles liked involved in regulating stomatal and protein synthesis.
Active absorption of elements is through
Absorption in symplast requires expenditure of energy.
Minerals essential for the formation of chlorophyll molecules are
Mg and Fe both are required for the formation of chlorophyll molecule.
A free living nitrogen-fixing cyanobacterium which can also from symbiotic association with the water fern Azolla is
The fresh water fern Azolla harbours Anabaena(a blue green alga)in its leaf cavities. Chorella is simply a green alga. Nostoc is a free living cyanobacteria involved in N2 fixation .
The sulphur containing amino acids are
Cysteine and methionine are the only sulphur containing amino acids in the cells.
Bacteria which change protein to ammonia are called.
Proteins from dead organisms are first converted into ammonia by ammonifying bacteria.
Boron in green plant assist in
Manganese is an activator of enzymes. Copper is essentials for photosynthesis. Molybdeum is a cofactor of enzymes. Boron assists in sugar transport.
Enzyme involved in nitrogen assimilation is
A molecule of N2 is changed to ammonia by nitrogenase.Transaminase transfer amino group from one sustrate to another.
Passive transport of ions is through
Passive transport happens in the apoplast only and it is through the transmembrane proteins/ion channels.
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