MCQ
The amount of energy flow in an ecosystem generally:
- ADecreases at each higher trophic level.
- BIncrease at each higher trophic level.
- CRemains same at each trophic level.
- DIs different in different food chains.
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$I.$ The bacteria Bacillusthuringiensis $(B t)$ are used to control butterfly catterpillers
$II.$ Fresh spores of $B t$ are mixed with water and sprayed on seeds such as brassicas and fruit trees
$III.$ Insect larvae, after eating these are killed by the toxin released in their gut
$IV.$ Bt toxin genes have been introduced into plants to provide resistance to pests
Which of the statements given above are correct?