“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.