The idea of food chain was introduced by which one of the following ecologist
Tansley
Elton
Clements
Phillipson
It’s obvious.
What is Darwinian fitness?
Population density of terrestrial organisms is measured in terms of individuals per
What is true about the isolated small tribal populations?
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of
$I.$ Many xerophytic plants have thick cuticle on leaf epidermis and sunken stomata
$II.$ Some xerophytic plants have special photosynthetic pathway $(CAM)$ that enables their stomata close during day
$III.$ Opuntia has spines (modified leaves), photosynthetic phylloclade (stem)
$IV.$ All adaptations are genetically fixed in all organisms
Choose the combinations of correct option
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