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 Multiple Choice QuestionsMultiple Choice Questions

1.

The enzyme responsible for atmospheric nitrogen fixation is

  • nitrogenase

  • hydrogenase

  • oxygenase

  • carboxylase


A.

nitrogenase

Enzyme nitrogenase plays a key role in N, fixations and remains active only during anaerobic condition. It is made up of two protein subunits :

i) non-heme iron protein or Fe-protein or dinitrogen reductase.

ii) Iron molybdenum protein or Mo-Fe protein or dinitrogenase


2.

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

  • Ca

  • Mo

  • Zn

  • Na


D.

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.


3.

Which one of the following elements is not an essential micronutrient for plant growth?

  • Mn

  • Zn

  • Cu

  • Ca


D.

Ca

Ca is essential macronutrient for plant growth. It is constituent of middle lamella, activator of enzymes, connected with chromosome formation and many aspects of metabolism

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4.

Lathyrism is caused by

  • dal

  • moth dal

  • khesari dal

  • Glycine


C.

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).


5.

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

  • Zinc

  • Molybdenum

  • Manganese

  • Copper


B.

Molybdenum

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


6.

Sulphur is an important nutrient for optimum growth and productivity in

  • pulse crops

  • cereals

  • fibre crops

  • oilseed crops


A.

pulse crops

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

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7.

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

  • Rhodobacter

  • Spirillum

  • Azotobacter

  • All of these


C.

Azotobacter

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

Clostridium is free living, anaerobic nitrogen fixing bacteria.


8.

Insects captured by insectivorous plants fulfil their requirements of

  • enzymes

  • oxygen

  • nitrogen

  • water


C.

nitrogen

The insectivorous plants grow in nitrogen deficient soil and their nitrogen requirement is fulfilled by capturing and digesting the insects.


9.

Examination of blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following is likely to alleviate his symptoms?

  • Thiamine

  • Folic acid and cobalamine

  • Riboflavin

  • Iron compounds


D.

Iron compounds

Anaemia refers to any condition in which there is an abnormally low haemoglobin concentration and/or blood cell count. The most common cause is deficiency of iron which is an essential element of haemoglobin molecule.
Thus, the iron compounds in the diet will help to alleviate the symptoms of anaemia.
Thiamine (vitamin B1), deficiency causes beri-beri.
Riboflavin (vitamin B2) deficiency causes cheilosis and skin diseases.

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10.

Hydroponics is a

  • soilless culture

  • airless culture

  • waterless culture

  • none of these


A.

soilless culture

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