Amniocentesis is a process to
Determine any disease in heart
Determine any heredity disease in the embryo
Know about the disease of brain
All the above
Which of the following is not used as a biopesticide?
Bacillus thuringinsis
Trichoderma harzianum
Nuclear polyhedrosis virus (NVP)
Xanthomonas campestris
Which of the following pesticides is an acetyl cholinesterase inhibitor?
Aldrin
Y-BHC
Endosulfan
Malathion
Geometric representation of age structure is a characteristic of
Biotic community
Population
Landscape
Ecosystem
The concept that population tends to increase geometrically while food supply increases arithmetically was put forward by
Stuart Mill
Adam Smith
Charles Darwin
Thomas Malthus
What is agent orange?
A biodegradable insecticide
A weedicide containing dioxin
Colour used in fluorescent lamp
A hazardous chemical used in luminous paints
A country with a high rate of population growth took measures to reduce it. The figure below shows age sex pyramids of populations. A and B twenty years apart. Select the correct interpretation about them.
‘A’ is more recent and shows slight reduction in the growth rate
‘B’ is earlier pyramid and shows stabilized growth rate
‘B’ is more recent showing that population is very young
‘A’ is the earlier pyramid and no change has occurred in the growth rate
Two opposite forces operate in the growth and development of every population. One of them is related to the ability to reproduce at a given rate. The force opposing to it is called
Biotic control
Mortality
Fecundity
Environmental resistance
DDT is
A non-degradable pollutant
An antibiotic
A biodegradable pollutant
Not a pollutant
Which one of the following statement is correct?
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies.
Both azotobacter and rhizobium fix atmospheric nitrogen in root nodules of plants.
Cyanobacteria such as anabaena and nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil.
At present it is not possible to grow maize without chemical fertilizers.
