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Is really a quadrilateral has no line of symmetry? quadrilateral means a figure of 4 lines.
I think we should write a quadrilateral has line of symmetry depending upon the shape.
IN ncert solutions symmetry chapter ex-14.1 in 7 question in h part it is given the shape which has no line of symmetry. It can be a square too which has line of symmetry and a quadrilateral too.
There is a question in NCERT book in Heredity and Evolution chapter's end exercise. The question is no. 12. According to your NCERT solutions the answer to it is yes and it has been further explained. But according to my teacher and some of my guide books the answer is no and they have their own detailed explanation. I'm writing here one such solution along with the question-
"Q. Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?
Ans. No. It is so because certain variations may not give any advantage to any individual organism in particular environmental conditions. These still persist and may confer an advantage to the individual in changed environmental conditions."