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First vascular plants are...

First vascular plants are

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(a) In `F_1` generation, all plants are tall (Tt)
(b) In `F_2` generation the ratio of tall plants to dwarf plant is 3:1. i.e. 3 tall and 1 dwarf
Three types of plants were obtained
Tall homozygous: TT - 1
Tall heterozygous: Tt - 2
Dwarf homozygous: tt-1

Dawrf plants were missing on `F_1` but reappered in `F_2` generation .
(ii) Sino-artial nole acts as the pacemaker of the heart becuase it is caplable of intiating implulse which can stimulate the heart muscles to coantract .
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