Anglosperms Оyronosperms
Swedis vascular
plands
Honvascular plants
Algol anestors
23.1 Name the most important adaptation(s) that evolyon at each of the
positions labeled A, B and
232 Which arison of plants vs pretented as novascular plande in
the diagram?
233 Explain why the seedless vascular plants are able to grow in the
non vascular plants
12
234 In what way as tweeds of gymnospermiferent to do
angiospermes?
22 9
2.35 What is the collective name for all seed-bearing plants?​

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.