Multiple Choice QuestionsHeterocysts in Anabaena is helpful in
secondary growth
nitrogen-fixation
ion uptake
gaseous exchange
The statement given below are the deficiency symptoms of a certain element. Identify the element with the help of options that follow.
I. Stunted growth
II. Tissue necrosis
III. Curling appear first in young leaves
IV. Premature flower abscission
Choose the correct option
magnesium
boron
calcium
nitrogen
The nitrifying bacteria that convert the ammonia to nitrates are
Nitrosomonas and Nitrobacter
Azotobacter
Rhizobium sp.
Thiobacillus denitrificans
Nodules with nitrogen-fixing bacteria are found in
cotton
gram
mustard
wheat
B.
gram
Leguminous plants such as grams, beans, peas soyabeans, peanuts, alfalfa and clover contain root nodules. Later are formed due to symbiotic association between roots of leguminous plane and bacterium Rhizobium. The plants furnish anaerobic conditions and growth nutrients for the bacteria and the bacteria fix nitrogen to the plant.
The plant ash is an indication of :
organic matter of plant
waste product
mineral salts absorbed by plants
none of these
Hydroponics is
cultivation of plants in water
growth of plants towards water
growth of plants away from water
soil less cultivation of plants
When one element is involved in opening and closing of stomata, the other helps to maintain the ribosome structure. They are
Potassium and calcium
Phosphorus and sulphur
Potassium and magnesium
Iron and magnesium
Iron and magnesium
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