Which one of the following processes during decomposition is correctly described? 

• Fragmentation - Carried out by organisms such as earthworm

• Humification - Leads to the accumulation of a dark coloured substance humus, which undergoes microbial action at a very fast rate

• Catabolism - Last step in the decomposition under fully anaerobic condition

• Catabolism - Last step in the decomposition under fully anaerobic condition

Match the name of the animal (Column I ) with one characteristic (Column II) and the phylum/class (Column III ) to which it belongs

• 	Column I	Column II	Column III
  a	Petromyzon	Ectoparasite	Cyclostomata

• 	Column I	Column II	Column III
  b	Lchthyophis	Terrestrial	Reptilla

• 	Column I	Column II	Column III
  c	Limulus	Body covered by chitinous exoskeleton	Pisces

• 	Column I	Column II	Column III
  c	Limulus	Body covered by chitinous exoskeleton	Pisces

103.

In which of the following both pairs have correct combination?

• Gaseous nutrient cycle	Carbon and Nitrogen
  Sedimentary nutrient cycle	Sulphur and Phosphorus

• Gaseous nutrient cycle	Carbon and Sulphur
  Sedimentary nutrient cycle	Nitrogen and Phosphorus

• Gaseous nutrient cycle	Nitrogen and Sulphur
  Sedimentary nutrient cycle	Carbon and Phosphorus

• Gaseous nutrient cycle	Nitrogen and Sulphur
  Sedimentary nutrient cycle	Carbon and Phosphorus

During ecological succession

• the gradual and predictable change in species composition occurs in a given area.

• the establishment of a new biotic community is very fast in its primary phase.

• the number and types of animals remain constant.

• the number and types of animals remain constant.

Most animals that in deep oceanic water are

• primary consumers

• secondary consumers

• tertiary consumers

• tertiary consumers

Deficiency symptoms of nitrogen and potassium are visible first in

• senescent leaves

• young leaves

• roots

• roots

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

• Sulphur cycle

• Phosphorus cycle

• Nitrogen cycle

• Nitrogen cycle

Identify the possible link A in the following food chain
Green plant Insect  Frog  A  Eagle

• rabbit

• wolf

• cobra

• cobra

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?

• Level PC is insects and level SC is small insectivorous birds

• Level PP is phytoplanktons in sea and Whale on top level TC

• Level on PP is pipal trees and the level SC is sheep

• Level on PP is pipal trees and the level SC is sheep

Which one of the following is not a functional unit of an ecosystem?

• Energy flow

• Decomposition

• Productivity

• Productivity