1.

First vascular plants are

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Solution :(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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