Enzyme first used for nitrogen fixation:
1. Nitrogenase
2. Nitroreductase
3. Transferase
4. Transaminase
Passive absorption of minerals depends on:
1. Temperature
2. Temperature and metabolic inhibitor
3. Metabolic inhibitor
4. Humidity
Cytochrome is:
1. Metallo flavo protein
2. Fe containing porphyrin pigment
3. Glycoprotein
4. Lipid
Which aquatic fern performs nitrogen fixation:
1. Azolla
2. Nostoc
3. Salvia
4. Salvinia
Roots of which plant contains a pink pigment that has an affinity for oxygen:
1. Carrot
2. Soyabean
3. Mustard
4. Radish
What is the best pH of the soil for the cultivation of plants:
1. 3.4 – 5.4
2. 6.5 – 7.5
3. 4.5 – 8.5
4. 5.5 – 6.5
Grey spots of oat are caused by deficiency of:
1. Cu
2. Zn
3. Mn
4. Fe
Boron in green plants assists in:
1. Activation of enzymes
2. Acting of enzyme cofactor
3. Photosynthesis
4. Sugar transport
In which one of the following nitrogen is not a constituent:
1. Idioblast
2. Bacteriochlorophyll
3. Invertase
4. Pepsin
Plants deficient in the element zinc show its effect on the biosynthesis of which plant growth hormone:
1. | Auxin | 2. | Cytokinin |
3. | Ethylene | 4. | Abscissic acid |