19087.Which is the reason for highest biomass in aquatic ecosystem?
Benthonic and brown algae
Sea grass, and slime molds
Nanoplankton, blue green algae, green algae
Diatoms
19089.Savannahs are
Tropical rain forests
Dense forest with closed canopy
Grasslands with scattered trees
Desert scrub
19090.Which one of the following is commonly found in temperate coniferous forest?
Quercus
Dipterocarpus
Shorea robusta
Pinus wallichiana
19091.Plant species having a wide range of genetical distribution evolve into a local population known as
Ecotype
Biome
Ecosystem
Population
19092.
Assertion (A): True xerophytes store water in the form of mucilage which helps to withstand prolonged period of drought.
Reason (R): Vascular and mechanical tissues are well developed in true xerophytes.
The correct answer is:
Both A and R are true and R is the correct explanation of A
Both A and R are true, but R is not the correct explanation of A
A is true, but R is false
A is false, but R is true
19094.Which one of the following correctly represents an organism and its ecological niche?
Vallisneria and pond
Desert locust (Schistocerca) and desert.
Plant lice (aphids) and leaf
Vultures and dense forest
19095.The rate of formation of new organic matter by rabbit in a grassland, is called
Net productivity
Secondary productivity
Net primary productivity
Gross primary productivity
19096.Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
It is upright in shape
Its base is broad
It shows energy content of different trophic level organisms
It is inverted in shape
19097.Which of the following is false?
Rate of succession is faster in secondary succession.
Quantity of biomass in a trophic level at a particular period is called as standing crop.
The energy content in a trophic level is determined by considering a few individuals of a species in that trophic level.
The succession that occurs in newly cooled lava is called primary succession.
19098.Niche is defined as the
Position of species in a community in relation to other species
Place where organism lives
Place where organism lives and performs its duty
Place where population perform their duties
19099.Which one of the following pairs in mismatched?
Tundra - permafrost
Coniferous forest - evergreen trees
Savanna - acacia trees
Prairie - epiphytes
19100.The correct sequence of plants in a hydrosere is
Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus
Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox
Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak
Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana
19101.Identify the correct type of food chain :
dead animal → blow fly maggots → common frog → snake
Decomposer food chain
Detrital food chain
Grazing food chain
Predator food chain
19102.The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do a, b and c represent respectively?
a - Regulator, b - Conformer, c - Partial regulator
a - Conformer, b - Regulator, c - Partial regulator
a - Regulator, b - Partial regulator, c - Conformer
a - Partial regulator, b - Regulator, c - Conformer
19104.Which one of the following is one of the characteristics of a biological community?
Sex-ratio
Stratification
Natality
Mortality
19105.These belong to the category of primary consumers
Snakes and Frogs
Insects and cattle
Eagle and snakes
Water insects
19106.Transfer of energy in different trophic levels of an ecosystem is called
Bioenergetics
Biosystem
Geobiocoenosis
Holocoenotic