Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

$(a)$ 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

$R$ : The main stimulus for these quick changes is due to input from the proprioreceptors, which monitor movements of joints and muscles.

$(I)$. Each neuron has a cell body

$(II)$. Each neuron has a single axon

$(III)$. Neurons are the functional units of nervous system

Select the correct option