MCQ
Following pyramid indicates
- AMore phytoplanktons and less zooplanktons
- BSimilar phytoplanktons and zooplanktons
- CLess zooplanktons and more phytoplanktons
- ✓Less phytoplanktons and more $3$ zooplanktons
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$A.$ Mosses and lichens are the first organisms to colonise a bare rock.
$B.$ Selaginella is a homosporous pteridophyte.
$C.$ Coralloid roots in Cycas have $VAM$.
$D.$ Main plant body in bryophytes is gametophytic, whereas in pteridophytes it is sporophytic.
$E.$ In gymnosperms, male and female gametophytes are present within sporangia located on sporophyte.
$I.$ Gene therapy is a genetic engineering technique used to treat diseases at molecular level.
$II.$ Calcitonin is medically useful recombinant product in the treatment of infertility.
$III.$ Bt toxin is a biodegradable insecticide obtained from Bacillus thuringiensis.
| Column $– I$ | Column $- II$ |
| $(a)$ Thrive in wide range of temperature | $(i)$ Eurythermal |
| $(b)$ Tolerant of a wide range of salinities | $(ii)$ Stenothermal |
| $(c)$ Thrive in narrow range of temperature | $(iii)$ Euryhaline |
| $(d)$ Tolerant of a narrow range of salinities | $(iv)$ Stenohaline |