. In which of following, the plants have all roots?
(a) Podostemon
(b) Lemna
(c) Wolffia
(d) Utricularia
To which of the following directional stimulus roots of a plant do not respond?
(a) moisture
(b) candlelight
(c) touch
(d) gravity
Which of the following plant part exhibits negative phototropism ?
(a) root
(b) branch
(c) leaves
(d) stem