Which one of the following is being tried in India as a biofuel substitute for fossil fuels

• Jatropha

• Azadirachta

• Musa

• Musa

Which one of the following is not used for construction of ecological pyramids?

• Dry weight

• Number of individuals

• Rate of energy flow

• Rate of energy flow

Treatment of seed at low temperature under moist conditions to break its dormancy is called

• scarification

• vernalization

• chelation

• chelation

44.

Which ecosystem has the maximum biomass?

• Forest ecosystem

• Grassland ecosystem

• Pond ecosystem

• Pond ecosystem

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :

• Tropical Savannah

• Tropical Rain Forest

• Grassland

• Grassland

Match the items given in Column I with those in Column II and select the correct option given below :

Column I		Column II
a	Eutrophication	i	UV-B radiation
b	Sanitary landfill	ii	Deforestation
c	Snow blindness	iii	Nutrient enrichment
d	Jhum cultivation	iv	Waste disposal

• a	b	c	d
  ii	i	iii	iv

• a	b	c	d
  i	iii	iv	ii

• a	b	c	d
  i	ii	iv	iii

• a	b	c	d
  iii	iv	i	ii

In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?

• Carbon

• Cl

• Oxygen

• Fe

What type of ecological pyramid would be obtained with the following data?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g

• Inverted pyramid of biomass

• Pyramid of energy

• Upright pyramid of biomass

• Upright pyramid of numbers

Which of the following is a secondary pollutant?

• CO

• CO₂

• O₃

• SO₂

World Ozone Day is celebrated on

• 5^th June

• 21^st April

• 22^nd April

• 16^th September