Upper part of sea/aquatic ecosystem contains
Plankton
Nekton
Plankton and Nekton
Benthos
Soil water available to roots is
Surface water
Hygroscopic water
Gravitational water
Capillary water
Which one is true?
Commensalism when none of the interacting populations affect each other
Symbiosis when the interaction is useful to both the populations
Symbiosis when neither populations affects each other
Commensalism when the interaction is useful to both the populations
Food chain in which microorganisms breakdown the food formed by primary producers is
Parasitic food chain
Detritus food chain
Consumer food chain
Predator food chain
Pick up the correct food chain
Grass Chamelion Insect Bird
Grass Fox Rabbit Bird
Phytoplankton Zooplankton Fish
Phytoplankton Bacteria Insect larvae
River water deposits
Loamy soil
Alluvial soil
Laterite soil
Sandy soil
A fertile agricultural soil appears deep coloured at the surface as compared to soil one metre down. The reason for colour of top soil
More moisture
Rich in organic matter
Rich in iron, calcium and magnesium
Recent formation
Soil particles determine its
Texture
Field capacity
Water holding capacity
Soil flora
Study of inter-relationships between organisms and their environment is
Ecology
Ecosystem
Phytogeography
Ethology
The sum total of the populations of the same kind of organisms constitute_______
Colony
Genus
Community
Species
Soil best suited for plant growth is
Clay
Loam
Sandy
Gravel
Competition for light, nutrients and space is most severe between
Closely related organism growing in different niches
Closely related organisms growing in the same area/niche
Distantly related organisms growing in the same habitat
Distantly related organisms growing in different niches
Association of animals when both partners are benefitted
Colony
Mutualism
Commensalism
Amensalism
A mutually beneficial association necessary for survival of both partners is
Mutualism/Symbiosis
Commensalism
Amensalism
Both 1 and 2
What is true of ecosystem?
Primary consumers are least dependent upon producers
Primary consumers out-number producers
Producers are more than primary consumers
Secondary consumers are the largest and most powerful
In an ecosystem, which one shows one-way passage
Free energy
Carbon
Nitrogen
Potassium
The relation between algae and fungi in a lichen is:
Symbiosis
Parasitism
Commenalism
Protocooperation
Pyramid of numbers in a grassland/true ecosystem is
Always inverted
Always upright
Both A and B
Spindle-shaped
Homeostasis is
Tendency of biological systems to change with change in environment
Tendency of biological systems to resist change
Disturbance of self regulatory system and natural controls
Biotic materials used in homeopathic medicines.
Deep productive soil is productive due to high proportion of
Sand and Zinc
Gravel and Calcium
Clay and Humus
Silt and Earthworm