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

Natality refers to

• Death rate

• Birth Rate

• Number of individuals entering a habitat

• Number of individuals leaving the habitat

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

Column I		Column II
a	Herbarium	i	It is a place having a collection of preserved plants and animals
b	Key	ii	A list that enumerates methodically all the species found in an area with brief description aiding identification
c	Museum	iii	Is a place where dried and pressed plant specimens mounted on sheets are kept
d	Catalogue	iv	A booklet containing a list of characters and their alternates which are helpful in identification of various taxa.

• a	b	c	d
  (i)	(iv)	(iii)	(ii)

• a	b	c	d
  (iii)	(ii)	(i)	(iv)

• a	b	c	d
  (iii)	(iv)	(i)	(ii)

• a	b	c	d
  (ii)	(iv)	(iii)	(i)

The direction of energy flow is

•  Producers → Herbivores → Decomposers → Omnivores

• Producers → Carnivore → Herbivores → Decomposes

• Decomposers → Carnivores → Herbivores → Producers

• Producers → Herbivores → Carnivores → Decomposers

If the Bengal tiger become extinct

• Hyenas and wolves will become scarce

• Its gene pool will be lost forever

• The wild areas will be safe for man and domestic

• The population of beautiful animals like deer will get stabilised

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Stability of ecosystem depends upon

• Primary productivity

• Interchange between producers and consumers

• Number of producers

• Number of consumers

Overlapping region between two ecosystems is called

• Biome

• Ecotone

• Niche

• Photic zone