71.

High value of BOD (Biochemical Oxygen Demand) indicates that

• water is pure

• water is highly polluted

• water is less polluted

• water is less polluted

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field A possible reason for these changes is that:

• both plant populations in this habitat decreased

• population B competed more successfully for food than population A

• population A produced more offspring than population B

• population A produced more offspring than population B

Most animals are tree dwellers in a 

• coniferous forest

• thorn woodland

• temperature deciduous forest

• temperature deciduous forest

Cryopreservation of gametes of threatened species in viable and fertile condition can be referred to as

• In situ conservation of biodiversity

• advanced exsitu conservation of biodiversity

• in situ conservation by sacred groves

• in situ conservation by sacred groves

Rachel Carson's famous book 'Silent Spring' is related to

• pesticide pollution

• noise pollution

• population explosion

• population explosion

Which of the following is not one of the prime health risks associated with greater UV radiation through the atmosphere due to depletion of stratospheric ozone?

• Increased skin cancer

• Reduced Immune System

• Damage to eyes

• Damage to eyes

Which one of the following matches is correct?

• Phytophthora

  Aseptate mycelium

  Basidiomycetes

• Alternaria

  Sexual reproduction

  Deuteromycetes

• Mucor

  Reproduction by conjugation

  Asocmycetes

• Mucor

  Reproduction by conjugation

  Asocmycetes