MCQ
Keystone species in an ecosystem are those which.
- AAre present in maximum number.
- BAre most frequent.
- CAttain a large biomass.
- DContribute to ecosystem properties.
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A drug used for ...$A$... patients is obtained from a species of the organism ...$B$.... It helps in clearing blood clots inside the blood vessels.
The one correct option for the two blanks are
$II.$ Chemical theory of origin of life was given by $....B......$
Statement $2$: Father is not responsible for the sex of the child
Statement $I:$Cleistogamous flowers are invariably autogamous
Statement $II:$Cleistogamy is disadvantageous as there is no chance for cross pollination.
In the light of the above statements, choose the correct answer from the options given below :