A. Eichhornia crassipes
B. Solanum nigrum
C. Hydrilla
D. Parthenium hysterophorus
E. All of these
Related Mcqs:
- During anaerobic digestion of organic waste, such as in producing biogas, which of the following is left undegraded?
A. Lignin
B. Lipids
C. Cellulose
D. Hemi-cellulose - Which plant has become a troublesome weed in agricultural fields?
A. Cyperus rotundus
B. Eichhornia creassipes
C. Parthenium hysterophorus
D. Chenopodium album - Biological control component is central to advanced agriculture production. Which of the following is used as a third generation pesticide?
A. Pathogens
B. Pheromones
C. Insect repellant
D. Insect hormone analogue - When DDT was applied in an orchard as a pesticide, the fruit production decreased. This happened because:
A. DDT is a growth retardant
B. DDT disturbed hormonal balance essential for fruit setting
C. DDT killed the pollinating insects along with the pests
D. DDT inhibited flowering - The gross primary production is maximum in the following ecosystem:
A. Open sea
B. Grasslands and pastures
C. Coniferous forests
D. Tropical and sub-tropical forest - The efficiency of primary production in an ocean is:
A. 5%
B. 3.50%
C. 1%
D. 0.20% - According to Lindemann, the percentage of net production passed on to carnivores is:
A. 28.6
B. 26.8
C. 22.6
D. 22.8 - The blue revolution refers to enhancement in the production of:
A. Fishes
B. Crabs
C. Birds
D. Mammals - Production of constructional timber is:
A. The main enduses are all kinds of building construction wood containers and creates, cots and beds, mining timber
B. All sorts of carts, truck, bus and trolley bodies, bamboo carts, boards, railway carriages
C. Building construction and wood containers alone constitute about 50% of the consumption
D. All of the above - At present ______ population is living in the watershed areas and are converting forest into agriculture land for food production:
A. 50-80%
B. 55-85%
C. 60-90%
D. 65-95%
The correct answer to the question: "Besides dung, the weed that can be used in biogas production is:" is "Eichhornia crassipes ".
