Question

Identify the stimulus in
1) The tip of stem growing away from earth's surface
2) Growth of pollen tube towards ovule during fertilisation

Answer 1

$\huge \sf \green{ANSWER}$

1. Gravity.

2. Chemicals.

$<marquee > </strong><strong>Brainlist</strong><strong> </strong><strong>Please</strong><strong> ☺️</strong><strong>.$

Answer 2

$\huge\mathfrak\pink{\underline{\underline{AnSwer}}}$

1) Tip of stem growing away from earth surface, the response to external stimulus is called tropism(stem shows negative geotropism whereas roots shows positive geotropism)

2) Growth of pollen tube towards ovule is chemotropic movement (I.e stimulus due to chemicals)

Happy to help!

:)