\'Il Verizon LTE 09:18 Done 11 of 12 nidarians have surface cells called choanoc
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'Il Verizon LTE 09:18 Done 11 of 12 nidarians have surface cells called choanocytes that contain prey capturing structures known as nematocycts. The coelom of most deuterostomes develops from outpocketings of the endoderm of the gut. 19. Torsion is a unique characteristic of all mollusks 20. Fishes may rely on their lungs for buoyancy 21. Sessile animals are often filter feeders. 22. Fruits are expanded anthers 23. During double fertilization, one sperm nucleus unites with the micropspore mother cell 24. Coenocytic fungi have many nuclei in one extensive cytoplasm 25. Segmentation allowed the development of specialized appendages. 26. Animals that have nerves always have brains. 27. Mollusks have closed circulatory systems 28. You could kill a starfish by cutting off its arms. 29. Reptiles never have gill slits 30. The heart of an adult amphibian has three chambers 31. Phloem transports organic nutrients from leaves to roots. 32. Sieve tube members are found in xylem 33. Tracheids are a type of cell in phloem. 84. xylem transports water from roots to leaves 35. Sponges have three tissue layers 36. Most higher plants have a minute diploid phase. 37. Many fungi depend on plants for mineral absorption. 38. If a lichen were sprayed with a chemical that blocked photosyntheis, it would probably die. 39. The insects include more species than any other group. 40. Poikilotherms are unable to produce body heat. 41. Leaves are broad and thin to minimize their absorption of oxygen. 42. Water can hold more oxygen than air can. 43. Book lungs are found in crustaceans and mollusks, while external feathery gills are found in arachinids 44. Saprobes parasitize plants. 45. In coelomates, but not in pseudocoelomates, a peritoneum completely lines the coelomic cavity 46. Trypanosomes possess a kinetoplast ( a mass of mitochondrial DNA close to the nucleus 47. Psychrophiles live in extremely hot conditions9Above 100C 48. Spirogyra is a plant protist 49. Shigella spp is a bacteria that causes dysentery 50. Anthrax is a bacteria that can be used in terrorism.Explanation / Answer
17.False
Cnidarians contain specialised cells known as cnidocytes (stinging cells) containing organells called nematocytes(stingers).These are present around the mouth and tentacles and serve to immobalise prey with toxins contained within the cells.
Chanocytes are a flagelleted cell with a collar of protoplasm at the base of the flagellum,numbers of which line the internal chambers of sponges.
18.False
In Deuterostomes formstion of the coelom is by pinching off the layers of mesoderm from the gut.
19.true
Torsion is gastropod synapomorphy which occur in all gastropods during larval development.Torsion is the rotation of the visceral mass,mantle,and shell 180degree with respect to the head and foot of the gastropod.
Gastropods are commonly known as snails and slugs are a large taxonomic class within the phyllum Mollusca.
20.true
The swim bladder,gas bladder,fish maw or air bladder is an internal gas filled organ that contributes to the ability of many bony fish to control their buoyancy,and thus stay at their current water depth without having to waste energy in swimming.
The swim bladder is evolutionarily homologous to the lungs.Charles Darwin remarked upon this in On the Origin of Species.
21.True
Sessile means "permanently attached" typically under water to the seafloor.They can not move which is a significant challenge in terms of predators and obtaining food.
Filter feeders are animals that eat by filtering/straining food floating in sea water.Often there is larva stage of reproduction when they are not sessile but mobile and float around in the ocean.
22.False
Anther is a part of the stamen where is pollen is produced.Fertilization occurs when a pollen grains germinate on the stigma and send down a pollen tube which releases the sex cells to fertilize the ovules.After fertilization,the ovules become the seeds and the ovary wall become the fruits.
23.False
During double fertilization,one sperm fuses with the egg nucleus to form a zygote.the other sperm fuses with the two polar nuclei inside the endosperm mother cell,which serves as the source of nutrition for developing embryo.
24.true
A hypha is a multibranched tuular cell filled with cytoplasm.In Coenocytes the nuclii are scattered throighout the cytoplasm.In septate huphae,each cell may contain one to many nuclei,depending on the type of fungus,or the stage of hyphal development.
25.True
Segmentation allows the development of specialized appendages.
26.False
Bivalves(clams and oysters) have centralized neural structures but no brains but rather are considered ganglia,or masses of neurons that perform a specific functions.
27.False
The open circulatory system is common to mollusks and arthropods.Open circulatory system pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
28.False
Starfish are unique among aquatic life because they have the ability to regenerate an arm when they lose one.
29.true
Human embryo do not have gill slits,they have pharyngeal pouches.In fish,these develop into gills,but in reptiles,mammals and birds,they develope into other structures and never even rudimentary gills.
30.True
The frog heart has 3 chambers:two artria and a single ventricle.the atrium receives deoxygenated blood from the blood vessels that drain the various organs of the body.
31.true
The sugar and other organic molecules are transported through the plant by means of special layer of tissue called phloem.Phloem is composed of living cells that transport a water solution of sugars that we commonly call sap.
32.False
In plant anatomy,sieve tube elements,also called sieve tube members,are highly specialized type of elongated cell in the phloem tissue of flowering plants.The ends of these cells are connected with other sieve tube members,and together they constitute the sieve tube.
33.false
Tracheids are primitive conducting elements of xylem.Tracheids dead and lignified cells.the deposition of lignin on cell wall is responsible to form a different type of thickenings.
34.True
Plants have two different types of transport tissue.Xylem transports water and solutes from roots to the leaves,phloem transports food from the leaves to the rest of the plant.
35.False
Many,but not all,animals produce three embryonic tissue layers the endoderm,mesoderm and ectoderm.Some animals,most notably sponges lack these tissue layers.
36.false
Plants alternate between the haploid phase and a diploid phase.The diploid phase is dominant in higher plants.
37.true
Symbiosis between the fungi and plant roots enhancing the uptake of water and nutrients by the host plant.Ex:Mycorrhiza
38.False
Lichens are symbiotic organisms.It is not completely depending on photosynthesis.
39.true
Insects are hexapod invertebrates and the largest group within the arthropod phylum.insects are the most diverse group of animals,they include more than a million described species and represent more than half of all known living organisms.
40.True
A poikilotherms are animals whose internal temperature varies considerably.
41.False
Leaves double as ,eans to exchange photosynthetic gases with the environment.Leaves are broad and flat to allow for effecient light harvest.
42.False
Oxygen only dissolves to the extent of the few milligrams per litre of water,On the other hand,the density of air is around 1200 mg per litre.Since the air is about 23% oxygen by mass,this means there is approximately 276mg of oxygen per litre of air.
43.False
A book lung is a type of respiration organ used for atmospheric gas exchange that is found in many arachnids,such as scorpions and spoders.
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