MCQ
The free$-$living fungus Trichoderma can be used for:
- AKilling insects.
- ✓Biological control of plant diseases.
- CControlling butterfly caterpillars.
- DProducing antibiotics.
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$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?
$(1)$ Medical termination of pregency $(MTP)$ during first trimester is generally safe
$(2)$ Generally chances of conception are nil until mother breast-feeds the infant upto two years
$(3)$ Intrauterine devices like copper$-T$ are effective contraceptives
$(4)$ Contraception pills may be taken upto one week after coitus to prevent conception Which two of the above statements are correct?