Explain the stages of development of planets ? In points.
Answers
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A ɴᴇᴡʟʏ-ғᴏʀᴍᴇᴅ ᴛᴇʀʀᴇsᴛʀɪᴀʟ ᴘʟᴀɴᴇᴛ, sᴜᴄʜ ᴀs ᴛʜᴇ Eᴀʀᴛʜ ᴏʀ Vᴇɴᴜs, ɢᴏᴇs ᴛʜʀᴏᴜɢʜ ғᴏᴜʀ ᴅɪsᴛɪɴᴄᴛ sᴛᴀɢᴇs ᴏғ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ: Dɪғғᴇʀᴇɴᴛɪᴀᴛɪᴏɴ, Cʀᴀᴛᴇʀɪɴɢ, Fʟᴏᴏᴅɪɴɢ ᴀɴᴅ Sᴜʀғᴀᴄᴇ Eᴠᴏʟᴜᴛɪᴏɴ
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Answer:
1. Vegetative Stage. - This is generally a lengthy period of development in plants, starting from seed germination until prior to reproductive stage. In seed germination the young, quiescent plant (embryo) within the seed initiates active growth and ultimately the embryonic root (radicle) and the embryonic shoot (epicotyl) extend outward from the seed.
2. Reproductive Stage. - This stage of development in plants occurs after the vegetative or juvenile stage is completed. At this stage the plants are considered mature, that is, they are physiologically capable of commencing the production of reproductive parts: the flowers, fruits and seeds. This stage consists of the period from the time that the plant starts to form inflorescence or flower primordia (called booting in rice) until flowering, pollination, and fertilization.
3. Ripening stage. - In annual crops, this is the developmental stage during which botanical fruits and seeds are formed. But for horticultural crops, ripening has been defined as “the composite of the processes that occur from the latter stages of growth and development through the early stages of senescence and that results in characteristic aesthetic and/or food quality.
4. Senescence. - This is the final stage of development in plants during which physical and chemical changes occur leading to the death of the whole plant. In annual plants, senescence may start during the reproductive stage and plant death sets in soon after seed maturity which marks the end of irreversible growth.