Which of the following plant growth responses is primarily due to the action of auxins?
a) leaf abscission
b) the triple response of shoots
c) cell division
d) the detection of photoperiod
e) cell elongation

The correct answer is E) cell elongation.

Auxins are a group of naturally occurring hormones such indole acetic acid. It is produced in the apical meristem and make plant cells grow. The principal function of the auxin to stimulate plant cells to elongate. Besides cell elongation, it stimulates root branching when it is applied to stem cut and it also promotes fruit development.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.