$A$ distinctive and characteristic functional group in fats is

The steps of a plant breeding program are given below. Arrange them in the correct sequence.
$(a)$ Cross-hybridization among the selected parents
$(b)$ Testing,release,and commercialization of new cultivars
$(c)$ Collection of variability
$(d)$ Selection and testing of superior recombinants
$(e)$ Evaluation and selection of parents

If $x^2+\alpha y^2+2 \beta y=a^2$ represents a pair of perpendicular lines,then $\beta$ equals to

The peculiarity of sponges is

The locus of the midpoints of the chords of the parabola $y^2 = 4ax$ which pass through the origin is:

The compound prepared by a substitution reaction of benzene is