Biology, asked by shashimakkapati, 10 months ago

How does auxin help in phototropism

Answers

Answered by Anonymous

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ᴡʜᴀᴛ ɪs ᴛʜᴇ ʀᴏʟᴇ ᴏғ ᴀᴜxɪɴ ɪɴ ᴘʟᴀɴᴛ ᴘʜᴏᴛᴏᴛʀᴏᴘɪsᴍ?

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sᴛᴀʀᴛɪɴɢ ᴡɪᴛʜ ᴛʜᴇ ʙᴀsɪᴄs:

1. ᴀᴜxɪɴ ɪs ᴀ ᴘʟᴀɴᴛ ʜᴏʀᴍᴏɴᴇ, sᴏ ɪᴛ ɪs ᴀ ᴄʜᴇᴍɪᴄᴀʟ sᴜʙsᴛᴀɴᴄᴇ ɪɴᴠᴏʟᴠᴇᴅ ɪɴ ʀᴇɢᴜʟᴀᴛɪɴɢ ᴛʜᴇ ᴀᴄᴛɪᴏɴ ᴏғ ᴄᴇʀᴛᴀɪɴ ᴄᴇʟʟs ᴡɪᴛʜɪɴ ᴀɴ ᴏʀɢᴀɴɪsᴍ.

2. ᴘʜᴏᴛᴏᴛʀᴏᴘɪsᴍ ɪs ᴛʜᴇ ᴘʀᴏᴄᴇss ʙʏ ᴡʜɪᴄʜ ᴘʟᴀɴᴛ ɢʀᴏᴡ ɪɴ ʀᴇsᴘᴏɴsᴇ ᴛᴏ ʟɪɢʜᴛ. ᴛʀᴏᴘɪsᴍs ᴀʀᴇ ʀᴇsᴘᴏɴsᴇs ᴛᴏ ᴅɪʀᴇᴄᴛɪᴏɴᴀʟ ᴇxᴛᴇʀɴᴀʟ sᴛɪᴍᴜʟɪ ᴀɴᴅ ʜᴇʀᴇ ᴘʜᴏᴛᴏ- ɪɴᴅɪᴄᴀᴛᴇs ɪᴛ ɪs ᴀ ʀᴇsᴘᴏɴsᴇ ᴛᴏ ʟɪɢʜᴛ.

ɴᴏᴡ, ʙᴀᴄᴋ ᴛᴏ ᴛʜᴇ ᴀᴄᴛᴜᴀʟ ϙᴜᴇsᴛɪᴏɴ:

ᴡʜᴇɴ ᴀ ᴘʟᴀɴᴛ sᴇɴsᴇs ᴀ ᴅɪʀᴇᴄᴛɪᴏɴᴀʟ ʟɪɢʜᴛ sᴛɪᴍᴜʟᴜs ɪᴛ ʀᴇᴅɪsᴛʀɪʙᴜᴛᴇsɪᴛs ᴀᴜxɪɴ ᴍᴏʟᴇᴄᴜʟᴇs ᴛᴏ ᴛʜᴇ sɪᴅᴇ ᴛʜᴀᴛ ɪs ғᴜʀᴛʜᴇʀ ᴀᴡᴀʏ ғʀᴏᴍ ᴛʜᴇ ʟɪɢʜᴛ. ᴀs ᴀ ᴄᴏɴsᴇϙᴜᴇɴᴄᴇ, ᴛʜᴇ ᴘʟᴀɴᴛ ᴄᴇʟʟs ᴛʜᴀᴛ ᴀʀᴇ ғᴜʀᴛʜᴇʀ ᴀᴡᴀʏ ғʀᴏᴍ ᴛʜᴇ ʟɪɢʜᴛ ᴇxᴘᴇʀɪᴇɴᴄᴇ ᴀ ɢʀᴇᴀᴛᴇʀ ᴀᴜxɪɴ ᴄᴏɴᴄᴇɴᴛʀᴀᴛɪᴏɴ ᴀɴᴅ ɢʀᴏᴡ ғᴀsᴛᴇʀ, ᴄᴀᴜsɪɴɢ ᴛʜᴇ sʜᴏᴏᴛ ᴛᴏ ʙᴇɴᴅ ᴛᴏᴡᴀʀᴅs ᴛʜᴇ ʟɪɢʜᴛ.

ᴀᴜxɪɴ ɪs ᴛʜᴇ ʜᴏʀᴍᴏɴᴇ ᴡʜɪᴄʜ ɪs ᴜsᴜᴀʟʟʏ sʏɴᴛʜᴇsɪsᴇᴅ ɪɴ ᴛʜᴇ ʏᴏᴜɴɢ ᴛɪᴘ ᴏғ ʀᴏᴏᴛs ᴀɴᴅ sʜᴏᴏᴛs. ᴡʜᴇɴ ʟɪɢʜᴛ ɪs ᴄᴏᴍɪɴɢ ғʀᴏᴍ ᴏɴᴇ sɪᴅᴇ ᴏғ ᴛʜᴇ ᴘʟᴀɴᴛ, ɪᴛ ᴅɪғғᴜsᴇs ᴛᴏᴡᴀʀᴅs ᴛʜᴇ sʜᴀᴅʏ sɪᴅᴇ ᴏғ ᴛʜᴇ sʜᴏᴏᴛ ᴡʜɪᴄʜ sᴛɪᴍᴜʟᴀᴛᴇs ᴛʜᴇ ᴄᴇʟʟs ᴛᴏ ɢʀᴏᴡ ʟᴏɴɢᴇʀ, ʀᴇsᴜʟᴛɪɴɢ ɪɴ ᴛʜᴇ ʙᴇɴᴅɪɴɢ ᴏғ sʜᴏᴏᴛ ᴛᴏᴡᴀʀᴅs ᴛʜᴇ ʟɪɢʜᴛ, ᴛʜᴜs ᴀᴜxɪɴ ᴘʀᴏᴍᴏᴛᴇs ᴘʜᴏᴛᴏᴛʀᴏᴘɪsᴍ

ᴀᴜxɪɴ ɪɴᴄʀᴇᴀsᴇs ᴛʜᴇ ғʟᴇxɪʙɪʟɪᴛʏ ᴏғ ᴘʟᴀɴᴛ ᴄᴇʟʟ ᴡᴀʟʟs ᴡʜɪᴄʜ ᴀʀᴇ ᴛʜᴇ ᴍᴀɪɴ ғᴀᴄᴛᴏʀ ʟɪᴍɪᴛɪɴɢ ᴘʟᴀɴᴛ ᴄᴇʟʟ ɢʀᴏᴡᴛʜ. ᴀs ᴀ ᴄᴏɴsᴇϙᴜᴇɴᴄᴇ, ᴘʟᴀɴᴛ ᴄᴇʟʟs ᴛᴇɴᴅ ᴛᴏ ɢʀᴏᴡ ғᴀsᴛᴇʀ ɪɴ ᴛʜᴇ ᴘʀᴇsᴇɴᴄᴇ ᴏғ ᴀᴜxɪɴ. ᴡʜᴇɴ ᴀ ᴘʟᴀɴᴛ sᴇɴsᴇs ᴀ ᴅɪʀᴇᴄᴛɪᴏɴᴀʟ ʟɪɢʜᴛ sᴛɪᴍᴜʟᴜs ɪᴛ ʀᴇᴅɪsᴛʀɪʙᴜᴛᴇsɪᴛs ᴀᴜxɪɴ ᴍᴏʟᴇᴄᴜʟᴇs ᴛᴏ ᴛʜᴇ sɪᴅᴇ ᴛʜᴀᴛ ɪs ғᴜʀᴛʜᴇʀ ᴀᴡᴀʏ ғʀᴏᴍ ᴛʜᴇ ʟɪɢʜᴛ. ᴀs ᴀ ᴄᴏɴsᴇϙᴜᴇɴᴄᴇ, ᴛʜᴇ ᴘʟᴀɴᴛ ᴄᴇʟʟs ᴛʜᴀᴛ ᴀʀᴇ ғᴜʀᴛʜᴇʀ ᴀᴡᴀʏ ғʀᴏᴍ ᴛʜᴇ ʟɪɢʜᴛ ᴇxᴘᴇʀɪᴇɴᴄᴇ ᴀ ɢʀᴇᴀᴛᴇʀ ᴀᴜxɪɴ ᴄᴏɴᴄᴇɴᴛʀᴀᴛɪᴏɴ ᴀɴᴅ ɢʀᴏᴡ ғᴀsᴛᴇʀ, ᴄᴀᴜsɪɴɢ ᴛʜᴇ sʜᴏᴏᴛ ᴛᴏ ʙᴇɴᴅ ᴛᴏᴡᴀʀᴅs ᴛʜᴇ ʟɪɢʜᴛ. ᴛʜɪs ᴍᴇᴄʜᴀɴɪsᴍ ᴀʟʟᴏᴡs ᴘʟᴀɴᴛs ᴛᴏ ᴏᴘᴛɪᴍɪᴢᴇ ᴛʜᴇ ᴀᴍᴏᴜɴᴛ ᴏғ ʟɪɢʜᴛ ᴛʜᴇʏ ʀᴇᴄᴇɪᴠᴇ ɪɴ ᴏʀᴅᴇʀ ᴛᴏ ɪɴᴄʀᴇᴀsᴇ ᴘʜᴏᴛᴏsʏɴᴛʜᴇsɪs ʀᴀᴛᴇs.

ᴛʜᴇ ғɪɢᴜʀᴇ ʙᴇʟᴏᴡ sᴜᴍᴍᴀʀɪᴢᴇs ᴛʜɪs ϙᴜɪᴛᴇ ᴡᴇʟʟ (ɴᴏᴛᴇ ᴛʜᴀᴛ ɪᴀᴀ ɪs sɪᴍᴘʟʏ ᴛʜᴇ ᴛʏᴘᴇ ᴏғ ᴀᴜxɪɴ ᴛʜᴀᴛ ʀᴇɢᴜʟᴀᴛᴇs ᴘʜᴏᴛᴏᴛʀᴏᴘɪsᴍ ɪɴ ᴘʟᴀɴᴛs)

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Answered by sreenidhi11

Answer:

Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.
This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism.
Auxin also plays a role in maintaining apical dominance.

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