The three main types of holloweds are: askon(a), sikon



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tarix14.04.2018
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  • The three main types of holloweds are: askon(a), sikon(b) and leykon(v).



. Diet: Sponges are filter feeders. Most sponges eat tiny, floating organic particles and plankton that they filter from the water the flows through their body. Food is collected in specialized cells called choanocytes and brought to other cells by amoebocytes

  • . Diet: Sponges are filter feeders. Most sponges eat tiny, floating organic particles and plankton that they filter from the water the flows through their body. Food is collected in specialized cells called choanocytes and brought to other cells by amoebocytes



















. osculum - a large opening in a sponge through which water flows out of the sponge. Sponges may have more than one oscula. ostia - a series of tiny pores all over the body of a sponge that let water into the sponge. One of these is called an ostium. pinacocyte - pinacocytes are the thin, flattened cells of the epidermis, the sponge's outer layer of cells. porocyte - cells with pores that allow water into the sponge; they are located all over the sponge's body. sessile - permanently attached to a substrate and unable to move on its own. Adult sponges are sessile.

  • . osculum - a large opening in a sponge through which water flows out of the sponge. Sponges may have more than one oscula. ostia - a series of tiny pores all over the body of a sponge that let water into the sponge. One of these is called an ostium. pinacocyte - pinacocytes are the thin, flattened cells of the epidermis, the sponge's outer layer of cells. porocyte - cells with pores that allow water into the sponge; they are located all over the sponge's body. sessile - permanently attached to a substrate and unable to move on its own. Adult sponges are sessile.











Jinsiy ko‘payish bulutlar tanasida amyobatsitlardan tuxum hujayrasi va spermatozoidlar hosil bo‘lishi orqali boradi. Germafrodit turlarda ularning ikkalasi ham har bir individning mezogleyasida hosil bo‘lsa, ayrim jinslilarda esa tuxum hujayralar va spermatozoidlar har xil individlarda rivojlanadi. Otalanish ona organizmida spermatozoidlarning suv oqimi orqali kirishi natijasida ro‘y beradi. Zigotadan kiprikli ko‘p hujayrali lichinka paydo bo‘ladi. Lichinkalar ona organizmidan tashqariga chiqib, biror suv substratiga yopishib, voyaga etgan bulutga aylanadi. Bulutlarda nafas olish va ayirish jarayonlari tana yuzasi orqali kechadi.

  • Jinsiy ko‘payish bulutlar tanasida amyobatsitlardan tuxum hujayrasi va spermatozoidlar hosil bo‘lishi orqali boradi. Germafrodit turlarda ularning ikkalasi ham har bir individning mezogleyasida hosil bo‘lsa, ayrim jinslilarda esa tuxum hujayralar va spermatozoidlar har xil individlarda rivojlanadi. Otalanish ona organizmida spermatozoidlarning suv oqimi orqali kirishi natijasida ro‘y beradi. Zigotadan kiprikli ko‘p hujayrali lichinka paydo bo‘ladi. Lichinkalar ona organizmidan tashqariga chiqib, biror suv substratiga yopishib, voyaga etgan bulutga aylanadi. Bulutlarda nafas olish va ayirish jarayonlari tana yuzasi orqali kechadi.











Skeleti to’rt o’qli, uch o’qli yoki bir o’qli ohak ninalardan iborat. Dengizlarning uncha chuqur bo’lmagan joylarida uchraydi, tanasi uncha yirik bo’lmaydi. Askon, sikon va leykon tipidan tuzilgan. Asosiy turlari Sycon, Leucon urug’lariga kiradi.

  • Skeleti to’rt o’qli, uch o’qli yoki bir o’qli ohak ninalardan iborat. Dengizlarning uncha chuqur bo’lmagan joylarida uchraydi, tanasi uncha yirik bo’lmaydi. Askon, sikon va leykon tipidan tuzilgan. Asosiy turlari Sycon, Leucon urug’lariga kiradi.













































G’ovaktanlilarning iqtisodiy ahamiyati uncha katta emas. Ayrim janubiy mamlakatlarda yumshoq organik skeletli tualet g’ovaktanlilari yuvish va yuvinish uchun, shuningdek har xil texnik maqsadlarda foydalaniladi. Chuchuk suv bodyagasining maydalangan skeletidan bod kasalligida terini ishqalash uchun foydalaniladi.

  • G’ovaktanlilarning iqtisodiy ahamiyati uncha katta emas. Ayrim janubiy mamlakatlarda yumshoq organik skeletli tualet g’ovaktanlilari yuvish va yuvinish uchun, shuningdek har xil texnik maqsadlarda foydalaniladi. Chuchuk suv bodyagasining maydalangan skeletidan bod kasalligida terini ishqalash uchun foydalaniladi.



















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