The plants are in the first chamber on the Jungle Planet, where you find the Laser Lance. The plants spring upward in a repeating cycle, so you can get back up to the spaceship by letting each one throw you up to the next higher plant.
It is a mechanical mouse. (see related question)
There is no Mechanical Island. However, Astro Knights Island is replete with robot plants and animals, while Steamworks island has actual plant monsters as well as mechanical devices. Game Show Island is populated by robots. (see the related questions)
You do not get or use a bucket on Astro Knights Island.
There is no treasure chest on Astro Knights Island.
Feed it the mechanical mouse (from the Maid's room) and the owl will follow you.
There are no bird eggs in astro knights island.
its on the island
To catch the mechanical mouse, in the Princess's Maid's room (castle first floor left).
How do you talk to the girl in the hay loft at astro knights island?
In the Maid's room (castle first floor left) you will find a mechanical mouse.
Click on Merlin (the mechanical owl) and the click on the "green thingy." Bingo! ;D
If you fed the mechanical mouse to the mechanical owl (Merlin), he will retrieve the green fuel rod. Click on him, then on the rod.