MCQ
Which of the following can use molecular nitrogen as nutrient?
- AMethanomonas
- BMucor
- CRhizobium
- DSpirogyra
Explanation:
Rhizobium fixes the nitrogen symbiotically. The nitrogen-fixing bacteria enter the roots and lead to the incessant growth of the cortical cells which form nodules that act as a primary site for the nitrogen fixation. The enzyme nitrogenase is primarily used for the conversion of molecular nitrogen.
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| Column $- I$ | Column $- II$ |
| $(a)$ Contraceptive pilll | $(1)$ Ejaculated semen would not enter into the female reproductive tract |
| $(b)$ Condom | $(2)$ Inhibit ovulation and implantation |
| $(c)$. Sterilsation | $(3)$ Increase phagocytosis of sperms |
| $(d)$ IUDs | $(4)$ Blocks gariete transport |