How do you express meaning of words like race, breed, cultivars or variety ?

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6.Evolution

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How do you express the meaning of words like race, breed, cultivars or variety ?

Option A

Option B

Option C

Option D

Solution

Race is a group of people who share similar and distinct physical characteristics. e.g Mongoloid, Caucasoid, Nerroid races of man.

A group of animals related by descent and similar in most characters like general appearance, features, size, configuration, etc., are said to belong to a breed. e.g Jersey, Sindhi, Holstein breeds of cow.

A cultivar is a plant or grouping of plants selected for desirable characteristics that can be maintained by propagation. e.g Pusa Gaurav of mustard.

A taxonomic category that ranks below species, its members differing from others of the same species in minor but heritable characteristics is called variety. e.g cauliflower and cabbage.

Standard 12

Biology

Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.

Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

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(AIIMS-2004)

Definitions / Explanation : Analogous organs & Vestigial or rudimentary organs

easy

Match the columns :

Column – $I$ Column – $II$

$(1)$ Human embryos have gill $(a)$ Chemical evolution

$(2)$  Oparin and Haldane $(b)$ Stimulation experiment

$(3)$  Miller and uray $(c)$ Wings of bird and butterfly

$(4)$  Analogous organ $(d)$ Outogeny repeats phylogeny

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The three natural processes that form the basis for evolution are

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$A$ : $A$ single large mutation called saltation can produce new species.
$R$ : Mutations are directional

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Column – $I$	Column – $II$
$(1)$ Human embryos have gill	$(a)$ Chemical evolution
$(2)$ Oparin and Haldane	$(b)$ Stimulation experiment
$(3)$ Miller and uray	$(c)$ Wings of bird and butterfly
$(4)$ Analogous organ	$(d)$ Outogeny repeats phylogeny

How do you express the meaning of words like race, breed, cultivars or variety ?

Solution

Similar Questions

Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits. Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

Definitions / Explanation : Analogous organs & Vestigial or rudimentary organs

Match the columns : Column – $I$ Column – $II$ $(1)$ Human embryos have gill $(a)$ Chemical evolution $(2)$ Oparin and Haldane $(b)$ Stimulation experiment $(3)$ Miller and uray $(c)$ Wings of bird and butterfly $(4)$ Analogous organ $(d)$ Outogeny repeats phylogeny

The three natural processes that form the basis for evolution are

$A$ : $A$ single large mutation called saltation can produce new species. $R$ : Mutations are directional

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Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.

Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

Match the columns :

Column – $I$ Column – $II$

$(1)$ Human embryos have gill $(a)$ Chemical evolution

$(2)$ Oparin and Haldane $(b)$ Stimulation experiment

$(3)$ Miller and uray $(c)$ Wings of bird and butterfly

$(4)$ Analogous organ $(d)$ Outogeny repeats phylogeny

$A$ : $A$ single large mutation called saltation can produce new species.
$R$ : Mutations are directional