31.

Heterocysts are present in

• Riccia

• Ulothrix

• Albugo

• Nostoc

A plant requires magnesium (Mg) for

• Holding cells together

• Protein synthesis

• Chlorophyll synthesis

• Cell wall development

Which is essential for root hair growth?

• Zinc

• Calcium

• Molybdenum

• Sulphur

Molybdenum causes

• mottling

• wilting

• reclamation

• chlorosis

Hydroponics is a

• soilless culture

• airless culture

• waterless culture

• none of these

Lathyrism is caused by

• dal

• moth dal

• khesari dal

• Glycine

The enzyme responsible for atmospheric nitrogen fixation is

• nitrogenase

• hydrogenase

• oxygenase

• carboxylase

Insects captured by insectivorous plants fulfil their requirements of

• enzymes

• oxygen

• nitrogen

• water

The deficiencies of micro-nutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport ?

• Cu, Mn, Fe

• Co, Ni, Mo

• Mn, Co, Ca

• Ca, K, Na

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

• Rhodobacter

• Spirillum

• Azotobacter

• All of these