Question

describe the structure of chloroplast?

Answer 1

It may be of the following structures:

(a) Spiral chloroplast. Example- Spirogyra.

(b) Belt-shaped chloroplast. Example- Ulothrix.

(c) Cup-shaped chloroplast. Example- Chlamydomonas.

(d) Star-shaped chloroplast. Example- Zygnema.
Structure of chloroplast:

The structure of chloroplast is very complicated. In a chloroplast, three parts are seen clearly when it is observed through the electron microscope

Membrane
Stroma
Grana
Membrane: A chloroplast is covered with a two-layered membrane. It is composed of lipid and protein. Structurally it is similar to the plasma membrane.

Stroma: the hydrophilic matrix is covered with the membrane. This matrix is called Stroma Ribosome, osmophilic granules etc. are present in the stroma.

Grans: Grana, which are sacs of coin-shaped double membranes called thylakoids are suspended in the stroma. The thylakoids contain chlorophyll and other pigments In each chloroplast there are usually about 40 to 60 grand and each granum may contain from 2 or 3 to more than 100 stacked thylakoids.

Two grans remaining side by side are linked together by some minute tubules, called stroma lamellae (sing lamella).

In the inner wall of each granum coin, there are some crystalline substances, called choantosome. Each choantosome contains chlorophyll-a, chlorophyll-b, carotin, zanthophyll, phospholipids, quinon, sulpholipid and different enzymes.

Answer 2

Answer:

ᴄʜʟᴏʀᴏᴘʟᴀsᴛs /ˈᴋʟɔːʀəˌᴘʟæsᴛs, -ᴘʟɑːsᴛs/ ᴀʀᴇ ᴏʀɢᴀɴᴇʟʟᴇs ᴛʜᴀᴛ ᴄᴏɴᴅᴜᴄᴛ ᴘʜᴏᴛᴏsʏɴᴛʜᴇsɪs, ᴡʜᴇʀᴇ ᴛʜᴇ ᴘʜᴏᴛᴏsʏɴᴛʜᴇᴛɪᴄ ᴘɪɢᴍᴇɴᴛ ᴄʜʟᴏʀᴏᴘʜʏʟʟ ᴄᴀᴘᴛᴜʀᴇs ᴛʜᴇ ᴇɴᴇʀɢʏ ғʀᴏᴍ sᴜɴʟɪɢʜᴛ, ᴄᴏɴᴠᴇʀᴛs ɪᴛ, ᴀɴᴅ sᴛᴏʀᴇs ɪᴛ ɪɴ ᴛʜᴇ ᴇɴᴇʀɢʏ-sᴛᴏʀᴀɢᴇ ᴍᴏʟᴇᴄᴜʟᴇs ᴀᴛᴘ ᴀɴᴅ ɴᴀᴅᴘʜ ᴡʜɪʟᴇ ғʀᴇᴇɪɴɢ ᴏxʏɢᴇɴ ғʀᴏᴍ ᴡᴀᴛᴇʀ ɪɴ ᴘʟᴀɴᴛ ᴀɴᴅ ᴀʟɢᴀʟ ᴄᴇʟʟs.

ᴛʜᴀɴᴋs ❤️

ᴀsʜʟᴇʏ ❤️