15969.In plants a common symptom caused by deficiency of P, K, Ca and Mg is the
Poor development of vasculature
Formation of anthocyanin
Bending of leaf tip
Appearance of dead necrotic areas
15970.A trace element essential for plant growth and radioactive isotope which is used in cancer therapy is known as
Calcium
Iron
Cobalt
Sodium
15972.Carnivorous plants are found on
Nitrogen deficient soil
O2 deficient soil
CO2 deficient soil
None of these
15973.Cultivation by sand culture is also called
Soil-less cultivation
Green house effect
Photorespiration
Protein synthesis
15974.Inorganic nutrients are present in the soil in the form of
Molecules
Atoms
Electrically charged ions
Organic compounds
15975.Angiosperm, to which the largest flowers belong, is
total stem parasite
partial stem parasite
total root parasite
partial root parasite
15976.Insectivorous plants grow where
There is carbohydrate deficient soil
There is nitrogen deficient soil
Vitamin c is required
Hormones are required
15979.Iron uptake is called active because
Ions move freely
Energy is expended
Ions are active
Ions move passively
15980.Which of the following minerals activate the enzymes involved in respiration?
Nitrogen and phosphorus
Magnesium and manganese
Potassium and calcium
Sulphur and iron
15982.Main function of leghemoglobin is to
Promote oxygen availability to nodules
Generate atp for nitrogen fixation
Generate hydrogen ions for ammonia formation
Scavenge oxygen
15983.Most plants obtain their nitrogen from the soil in the form of
Nitric acid
Nitrates
Free nitrogen gas
Nitrogen oxide
15984.In an experiment a plant was dried, crushed and heated strongly in a crucible for long. The residue contained
Amides and carbonates of about ten elements
Oxides and carbonates of three elements
Carbon only
Starch and related compounds
15985.One of the following is a nitrogen fixing enzyme
Urease
Arginase
Nitrate reductase
All of the above
15986.Deficiency of mineral nutrients is not responsible for
Shortening of internodes
Necrosis
Chlorosis
Etiolation
15987.In which of the following is nitrogen not a constituent?
Idioblast
Bacteriochlorophyll
Invertase
Pepsin
15988.Carrier proteins are involved in
Water transport
Water evaporation
Active transport
Passive transport