please answer the questions please
Answers
Ans 19. Properties are as follows...
(i) They form strong bonds as opposite charge attracts each other
(ii) There melting point is high
(iii) There boiling point is high
Ans 20. Cytokinnins promotes cell division
They helps in breaking the dormancy of seeds and buds
They delays the aging of leaves
Auxin promotes cell enlargement
They are responsible for cell differentiation
They ptomote fruit growth
Ans 21. Bryophyllum - Vegetative Propagation
Rhizopus - Spore Formation
Ans 22. Receptor > Sensory neurons > Relay neurons > Motor neurons > Effectors
Ans 23. (i) The incident ray , normal and the refracted ray , all lie on a same plane .
(ii) The ratio of sine of angle of incidence to sine of angle of refraction is always a constant in a given medium.