SECTION II. TRUE/FALSE. Decide whether these statements are true or false (13 @
ID: 266165 • Letter: S
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SECTION II. TRUE/FALSE. Decide whether these statements are true or false (13 @ 2 pts. each). Please mark the appropriate bubble on the SCANTRON sheet (18-30). TRUE = A FALSE = B 18) All Molluscs have a closed circulatory system. 19) Birds are reptiles. 20) The phloem transports organic nutrients such as sugars from where they are made to where they are needed. 21) A biannual is a type of flowering plant that lives many years. 22) Solutes move into a cell via osmotic diffusion. 23) A plant that can grow throughout its life is said to have determinant growth. 24) In some Arthropods, young resemble small adults, with different body proportions. This developmental process is called incomplete metamorphosis. 25) The feature of segmentation makes annelids and arthropods closely related 26) Animals from the phylum Platyhelminthes are pseudocoelomates. 27) Archeopteryx is thought to be the closest dinosaur relative of birds. 28) Therapsids were early warm blooded mammals. 29) Sponges belong to the subkingdom Eumetazoa. 30) The Arthropod subphylum Chelicerata includes crabs, lobsters and copepods.Explanation / Answer
18) False. Most molluscs have an open circulatory system where blood doesn't fully circulate through the organism. The blood is released from the heart to the vital areas once it has collected the oxygen that the gills have extracted from the water. Few molluscs such as squids have a closed circulatory system.
19) False. Birds are not reptiles. They are close on the phylogenetic tree and have a common ancestor .Birds do not fall under the classification reptilia since according to modern taxonomic classification, paraphyletic groups are not considered as valid clases, reptilia being the case.
20) True. Phloem transports organic nutrients from where they are made (Source) top where they are needed ( Sink).
21) False. A biannual is a plant that completes its life cycle in two years. Perennnials live for many years.
22) False. Solutes are unable to freely move across the cell membrane which is selectively permeable. Water however moves into and out of the cell through osmotic diffusion.
23) False. A plant which grows throughout its life is known to have an inderterminate growth. Determinate growth in plants ia genetically predetermined.
24) True. Incomplete metamorphosis refers to moulting of arthropods young ones through different nymphal stages which resemble the adult in smaller size until they finally reach the adult form.
25) False. Segmentation has appeared only once in the history of evolution and therefore has led to broad diversification of animals possessing it. Thus, these groups are not closely related to one another even though both arthropods and nnelids show body segmentation.The genes controlling segment formation during embryo development are almost the same in drosophila (an arthropod) and in annelid marine worms. These similarities lead to conclusion that the genes have been inherited from a common ancestor, which was itself segmented.
26) False. Animals from playhelminthes phylum are not pseudocoelomates. They are instead acoelomates and have no true body cavity.
27) True. Archaeopteryx is a transitional fossil, with features clearly intermediate between those of non-avian theropod dinosaurs and birds. Thus it is considered to be the closest dinosaur.
28) True.The ability to generate body heat, called endothermy to maintain a stable internal temperature, homeothermy, first emerged among therapsids, which are considered as the earliest warm-blooded mammals.The group yielded earliest mammal lineages during Triassic period.
29) False. Sponges belong to the subkingdom Parazoa.
30) False. Chelicerata includes horshoe crabs, ticks, mites and arachnids. Lobsters and copepods belong to subphylum Crustacea.
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