A. Ozone
B. N2O
C. Ethylene
D. PAN
Related Mcqs:
- The non-green plants are as important as the green plants because they:
A. Cause human disease
B. Cause diseases of other plants
C. Are useful in several industries
D. Bring about decomposition of dead animals and plant remains - Those chemicals which are produced by plants and affect other plants are broadly called:
A. Depresants
B. Allomones
C. Allelochemics
D. Kairomones - Among the plants listed, point out one that does not fit into ecological group represented by the other plants:
A. Acacia
B. Aloe
C. Euphorbia
D. Rhizophora - Among the plants listed, point out one that does not fit into biological group represented by other plants
A. Euphorbia
B. Acacia
C. Vallisneria
D. Aloe - Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine air borne particles which lead to:
A. Photochemical smog
B. Dry acid deposition
C. Industrial smog
D. Wet acid deposition - Which of the following plants shows insecticidal properties
A. Riccinus communis
B. Iberis amara
C. Cynodon dactylon
D. All of these - Which of the following is generally used for induced mutagenesis in crop plants?
A. Gamma rays (from cobalt 60)
B. X-rays
C. UV (260 nm)
D. Alpha particles - Exposure of plants to high fluoride concentration results in necrosis or chlorosis characteristics in:
A. Petiole but not in lamina
B. Only mid rib of lamina
C. Leaf tip and leaf margin
D. Stems tips only - Which of the following serves as source of carbon in plants:
A. CO2 of carbonic rocks
B. Atmospheric CO2
C. Fossil fuel
D. All of the above - Deserts plants have longer root system because:
A. High temperature of soil encourages root growth
B. Low temperature at night encourages root growth
C. Those plants adapted to produce long system can survive better in desert
D. Roots grow in search of water
The correct answer to the question: "The plants of tobacco and tomato are sensitive to:" is "Ozone ".