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 Multiple Choice QuestionsMultiple Choice Questions


A metal ion involved in stomatal regulation is :

  • iron

  • potassium

  • zinc

  • magnesium



Potassium ions are involved in the stomatal movement. Alongwith negative ions, K+ ions accumulate in guard cells in response to light. Solute potential become more negative, resulting in entry of water by osmosis and the turgid guard cells. Therefore, the turgidity of guard cell open the stomata.


Which of the following element plays an important role in nitrogen fixation

  • Zinc

  • Molybdenum

  • Manganese

  • Copper



Molybdenum is a component of nitrogenase and thus brings about fixation of gaseous nitrogen. It also act as enzyme activator of nitrate reductase.


Hydroponics is a

  • soilless culture

  • airless culture

  • waterless culture

  • none of these


soilless culture

Hydroponics refers to soil-less cultures of plants and growing them on mineral solution


Hydroponics is

  • cultivation of plants in water

  • growth of plants towards water

  • growth of plants away from water

  • soil less cultivation of plants


soil less cultivation of plants

Hydroponics is soil less cultivation of plants by placing the roots in the nutrient solution.


Which one of the following elements is almost non-essential for plants?

  • Ca

  • Mo

  • Zn

  • Na



Sodium and Iodine  are not required by most of the plants.

Sodium (Na) is required by very limited plants as it helps to concentrate carbon- dioxide, but mostly plants use a trace amount to produce metabolism.


The plant ash is an indication of :

  • organic matter of plant

  • waste product

  • mineral salts absorbed by plants

  • none of these


mineral salts absorbed by plants

The ash that is left after burning any dry part of the plant in a crucible, contains only mineral elements and is called plant ash. If dried plant parts are heated in silica crucible at 600°C, all organic substance vaporize and the remaining plant ash contains only inorganic substances or absorbed mineral elements.


Assertion: Nitrogen-fixing bacteria in legume root nodules survive in oxygen-depleted cells of nodules.

Reason: Legheamoglobin completely removes oxygen from the nodule cells.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


If both Assertion and Reason are true and Reason is the correct explanation of Assertion

Symbiotic hemoglobin (leghemoglobin) is a hemeprotein found in micromolar concentrations in infected cells of legume roots. This is an essential component for nitrogen fixation by legumes. Leghemoglobin is produced as a result of symbiotic association between bacteroid and plant.


The non- photosynthetic, non- symbiotic N2 fixing bacteria are

  • Rhodobacter

  • Spirillum

  • Azotobacter

  • All of these



Azotobacter, Beijerinkia are non photosynthetic, non symbiotic and aerobic nitrogen fixing bacteria.

Clostridium is free living, anaerobic nitrogen fixing bacteria.


Lathyrism is caused by

  • dal

  • moth dal

  • khesari dal

  • Glycine


khesari dal

Lathyrism is a neurological disease causd by khesari dal (Lathyrus odoratus). It carries an ODAP, also known as β-N-oxalyl-amino-L-alanine, or BOAA which is a neurotoxin (glutamate analogue).


Sulphur is an important nutrient for optimum growth and productivity in

  • pulse crops

  • cereals

  • fibre crops

  • fibre crops


pulse crops

Sulphur is constituent of certain amino acids. The amino acids form the protein by polymerisation. The pulses are rich in protein.