Involuntary actions in the body are controlled by

Write true or false for the statement: Symptoms of goitre lead to swelling in the abdomen.

Which part of the brain regulates and controls involuntary actions?

Name the plant hormones responsible for the following:
$(a)$ Elongation of cells
$(b)$ Growth of stem
$(c)$ Promotion of cell division
$(d)$ Falling of senescent leaves.

Which type of movement is responsible for the response to external stimuli seen in $Mimosa$ (touch-me-not plant)?

Give the function$(s)$ of the following plant hormones:
$(i)$ Auxins $(ii)$ Gibberellins $(iii)$ Cytokinins $(iv)$ Abscisic acid $(v)$ Ethylene