Plant movement in response to diffuse stimulus of light is

Phytoalexins are secreted by plants in response to fungal infection. These compounds are generally

Distinguish between:
$(1)$ Cell enlargement and Cell differentiation
$(2)$ Epigeal germination and Hypogeal germination

Name a hormone which:
$(A)$ is gaseous in nature
$(B)$ is responsible for phototropism
$(C)$ induces femaleness in flowers of cucumber
$(D)$ is used for killing weeds (dicots)
$(E)$ induces flowering in long day plants

Factors which can modify geotropic responses are

Which plant growth regulators are required to obtain callus?