STD 11 - 13. Plant growth and development — NEET STD 11 Science — Question

$(i)$ This group includes diatoms and golden algae.

$(ii)$ They are microscopic and float passively in water currents (plankton).

$(iii)$ Most of them are photosynthetic.

$(iv)$ They have deposits in their habitat; this accumulation over billion of years is referred to as 'diatomaceous earth'.

Reason : Plasmids are found in bacteria and are useful in genetic engineering.

$(a)$ Mosses and Lichens are the firstorganisms to colonise a bare rock

$(b)$ Selaginella is a homosporous pteridophyte

$(c)$ Coralloid roots in Cycas have VA Micorrhizae

$(d)$ Main plant body in bryophytes isgametophytic, whereas in pteridophytes it is sporophytic

$(e)$ In gymnosperms, male and female gametophytes are present within sporangia located on sporophyte