STD 11 - 12. Respiration in plants — BIOLOGY STD 11 Science — Question

$(1)$ Methanogens $(2) $ Anabaena $(3)$ $N_2$, fixation $(4)$ Thermoacido philus $(5)$ eykaryotes $(6)$ Diatoms $(7)$ gelatinous sheath $(8)$ Heterocyst

$R$ : Ionic channels are absent in the area covered by myelin sheath therefore, depolarization occurs only at the nodes of Ranvier, resulting in saltatory or jumping conduction.

$B.$ Selaginella is advance among pteridophytes as it produces seeds

$C.$ Pinus leaves are monomorphic, pinnate compound and have sunken stomata as adaptation against transpiration

$D.$ Sporic meiosis is characteristic of life cycle in many organisms like Volvox, Chlamydomonas and Ulothrix.