Mineral Nutrition

The plant ash is an indication of :

• organic matter of plant

• waste product

• mineral salts absorbed by plants

• none of these

A metal ion involved in stomatal regulation is :

• iron

• potassium

• zinc

• magnesium

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

• Rhodobacter

• Spirillum

• Azotobacter

• All of these

Lathyrism is caused by

• dal

• moth dal

• khesari dal

• Glycine

Sulphur is an important nutrient for optimum growth and productivity in

• pulse crops

• cereals

• fibre crops

• fibre crops

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.

Hydroponics is a

• soilless culture

• airless culture

• waterless culture

• 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

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

• Ca

• Mo

• Zn

• Na

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

• Zinc

• Molybdenum

• Manganese

• Copper