“Discover ecosystems, complex networks of organisms and their environment, and how they interact to sustain life on Earth.”
Class 12 Biology Chapter 11 Notes
​Similarity in characteristics resulting from common ancestry is known as: Homology
Fresh water ecosystem covers less than: 1%
Coniferous forests located at high latitude are called: Boreal
Human appendix, coccyx and nictiating membrane of the eye are: Vestigical organs
The perennial plants are bushes or cacti with large shallow root systems in: Deserts
A willow 10 centimetres (4 inches) high may have a trunk 7 centimetres (3 inches) in diameter and be 50 years old in: Tundra
Using the hardin-weinberg principle, which expression represents the frequency of the homo-zygous recessive genotype: q2
In sub humid tropical grassland rate of primary production is more than: 4000 g/m2
Grasslands present in temperate climates are also called: Prairies
In which of the following situations would evoluation be lowest for an inter breeding population: Migration Selection PressureVariation(Due to Mutation) AbsentLowLow
The existing species are the modified descendants of pre-existing ones according to: Theory of organic evolution
Which one of the following would cause the hardy-weinberg principle to be inacurate: There is no source of new copies of alleles from outside the population
Annual rain fall in deserts is less than: 25 to 50 cm
The random loss of alleles in a population is called: Genetic drift
Pinus wallichiana pinus roxbugil Abies pindrow picea smithiana Cederous deodara are plants of: Coniferous alpine and boreal forests
The parts of body use extensivly to cope with the environment become larger & stronger, while those that are not used deteriorate was argued by: Lamorck
The study of birds is: Ornithology
In tropical and subtropical grassland rain reaches about: 1500 mm
Macaca mulatta is commonly known as: Rhesus monkey
Which one of the following pairs represents analogous features: Mammal fore limb & bird wing
The average rainfall is between 750 – 1500 mm in: Temperate deciduous forests
In grassland ecosystem annual rainfall is about 250 to: 750 mm
Which one of the following pairs represents analogous features: Mammal fore limb & bird wing
Annual rain fall in deserts is less than: 25 to 50 cm
The term niche was first proposedly joseph Grinnell an American: Ornithologist
Once nitrate enters the plant cell it is reduced to: Ammonia
In grassland ecosystem annual rainfall is about 250 to: 750 mm
The existing species are the modified descendants of pre-existing ones according to: Theory of organic evolution
In 1917, term Niche was first proposed by American ornithologist named: Joseph Grinnell
The remoras benefit from this relationship the shark is not affected at all: Commercialism
Important : Review all previous years’ 12 class past papers for comprehensive practice and better exam preparation.
