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Agronomy-8

Q.1
Rice plants prefer absorption of fertilizer nitrogen in the form of_______.

NO3 -
NH4+
Amino acid


Q.2
Excessive N supply to plants promotes______________.
Mildew and rusts
Root-rot
Bacterial blight


Q.3
Good “Indicator plant” for N deficiency is__________.
Rice
Wheat
Maize


Q.4
The phosphorus in cell membranes is mainly present as_________.
Phospholipids
ATP
NADP


Q.5
Phosphorus supply to plants promotes growth of____________.
Fibres roots
Lateral roots
Fibre as well as lateral roots


Q.6
With an ample phosphorus supply to crops______.
Maturity period is delayed
Maturity period is early
Maturity period is unchanged

Q.7
Phosphorus supply to crops influences the fungal disease incidences by__________.

Increase disease incidence
Decreasing disease incidence
No change in disease incidence


Q.8
The optimum soil pH range for phosphorus availability to crops is_______.
5.0 - 6.0
6.0 - 7.0
7.0 - 8.0


Q.9
Phosphorus deficiency in plant appears at first in___________.
Older leaves
Younger leaves
Both


Q.10
Indicator plant for P deficiency indication is_______.
Maize
Tomato
Both


Q.11
Potassium supply to plants has a favourable effect on_____.
Protein synthesis
Respiration
Both


Q.12
Plants utilize potassium in the form of______.
K2
K+
Both


Q.13
Potassium deficiency symptoms in plants appear at first form________.
Lower most leaves
Upper most leaves
Middle leaves


Q.14
Potassium deficiency in plants in characterised by _________.
Leaf scorch
Tip burn
Both


Q.15
Indicator plant for monitoring K is_______.
Mustard
Pea
Potato


Q.16
Minerals are absorbed by the plants through_______.
Pressure flow
Diffusion
Active transport


Q.17
Potassium is employed in________.
Chlorophyll synthesis
Protein synthesis
Opening and closing of stomata


Q.18
Absorbed minerals are transported to other parts of the plants by________.
Imbibition
Ion exchange
Water stream


Q.19
Down word passage of mineral, from upper soil layers to lower soil strata is called______.
Percolation
Leaching
Weathering


Q.20
Soil nitrate is more likely to leach than ammonium due to its__________.
Small size
Negative charge
Being useless to flora


Q.21
Hydroponics is growing plants in__________.
Laboratory
Phytotron
Liquid culture medium


Q.22
Which one of the following essential elements normally obtain directly from the air.
Hydrogen
Carbon
Nitrogen


Q.23
Most of the plants obtain nitrogen from the soil in the form of_________.
Free nitrogen gas
Nitric acid
Nitrites


Q.24
Major nitrogen fixation is carried out by_______.
Chemical industries
Lighting
Symbiotic bacteria


Q.25
Which one does not contribute to nitrogen availability in the soil?
Decay of organic matter
Electric storms
Azotobactor

Number of score out of 25 = Score in percentage =


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