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19. Function of collenchyma tissue : collenchyma tissue gives mechanical strength and elasticity to growing steam.
19.. The muscles of heart shows rhythmic contraction and relaxation throughout life. These involuntary muscle called cardiac muscle. The cell of cardiac muscle are cylindrical, branched and uninucleated.
20. Bryophyta :
1. No Vascular tissue present.
2. Reproduce through spores.
3. Found on both land and water as amphibians.
Example = mosses
Pteridophyta :
1. Vascular tissue present.
2. Reproduce through spores.
3. Differentiated body structure.
Example = fern
21. Balanced force= if a body carry many forces and resultant of all forces acting on that body is zero then this type of force called balanced force.
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