MCQ
Yield of paddy field can be increased by application of:
- AIron bacteria
- BNostoc/ Anabaena
- CArchae bacteria
- DSymbiotic bacteria
Explanation:
Blue-green algae are ideally suited for propagation in rice fields because blue -green algae form a self-sufficient system which is capable of fixing atmospheric nitrogen in organic forms and which grows upon a free water surface. It increases nitrogen content of moist soil and water bodies, which can be used in increasing paddy yield.
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$I.$ Group of independent, interacting populations of same species
$II.$ Group of independent and interacting populations of same species in specific area
$III.$ Group of independent interacting populations of different species in a specific area
$IV.$ Group of independent and interacting populations of different species in different area
Select the correct option
Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals.
| Column $- A$ | Column $- B$ |
| $(1)\; AIDS$ | $(A)$ Rhino Virus |
| $(2)$ Common Cold | $(B)$ Carcinogen |
| $(3)$ Malaria | $(C)$ Salmonella |
| $(4)$ Cancer | $(D)$ Plasmodium |
| $(E)$ Retrovirus |