17. The coelom of most deuterostomes develops from outpocketings of the endoderm

Question

17. The coelom of most deuterostomes develops from outpocketings of the endoderm of the gut 18. Torsion is a unique characteristic of all mollusks. 19. Fishes may rely on their lungs for buoyancy. 20. Sessile animals are often filter feeders. 21. Fruits are expanded anthers. 22. The spleen filters blood and removes damaged red blood cells 23. Coenocytic fungi have many nuclei in one extensive cytoplasm. 24. Segmentation allowed the development of specialized appendages. 25. Animals that have nerves always have brains. 26. Mollusks have closed circulatory systems. 27. You could kill a starfish by cutting off its arms 28. Reptiles never have gill slits. 29. The heart of an adult amphibian has three chambers. 30. Phloem transports organic nutrients from leaves to roots 31. Sieve tube members are found in xylem. 32. Tracheids are a type of cell in phloem. 33. Xylem transports water from roots to leaves 34. Sponges have three tissue layers. 35. Higher plants have a minute diploid phase. 36. Many fungi depend on plants for mineral absorption. 37. If lichen were sprayed with a chemical that blocked photosynthesis, it would probably die. 38. The insects include more species than any other group. 39. Poikilotherms are unable to produce body heat. 40. Leaves are broad and thin to minimize their absorption of oxygen. 41. Water can hold more oxygen than air can. 42. Book lungs are found in crustaceans and mollusks, while external feathery gills are found in arachinids. 43. Saprobes parasitize plants. 44. In coelomates, but not in pseudocoelomates, a peritoneum completely lines the coelomic cavity 45. Trypanosomes possess a kinetoplast ( a mass of mitochondrial DNA close to the nucleus 46. Psychrophiles live in extremely hot conditions Above 100c 47. Spirogyra is a plant protist 48. Shigella spp is a bacteria that causes dysentery 49. Anthrax is a bacteria that can be used in terrorism. 50. Plants have internal clocks.

Explanation / Answer

Answer 17= false

In deuterostomes, the MESODERM forms an evagination of developed gut that separated out / pinch off to form coelom.

Answer 18=false

Torsion is unique feautre of all gastropods not molluscs

Answer19=false

Faishes have specialised structure called swim bladder.

For buoyancy fishes have to separate water equal to their body mass which is not easy in underwater envirnment with changes depths and densities.

So fishes have swim bladder which fills with gases when fishes come up and release gases when fishes go down in rivers.

Answer20=true e.g tunicates

Sessile means permanently attached to sea floor so they cant move from place to place for predation and food.

They do so by filtering water

Answer21=false

Stamen includes anther and filament Nd they main role is formations of pollens. While carpal is female reprodcmuctive part of plant which actually leads to fruit formation.

Answer22=true

Spleen is main organ for removal of damaged RBCs and platelets.

Answer23= true

Conencyte is single coordinated unit in some fungi which contain many nuclei/functioning toghther.

Note feasible to answer all parts at one time..please divide amd repost it

Thanku

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