29 Which of the following is descriptive of protostomes? A) spiral and indeiermi
ID: 272793 • Letter: 2
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29 Which of the following is descriptive of protostomes? A) spiral and indeierminate cleavage, blastopore becomes mouth, schizococlous development B) spiral and determinate cleavage, biastopore becomes mouth, schizocoelous development C) spiral and deterninase cleavage, blassopore becomes anus, enteroccelous development D) radial and delerminae cleavage, bisstopore becomes anus,enierocoelous developmert E) radial and determinate cleavage, blastopore becomes mouth, schizocvelous 30. Which of the following is an example of osmosis? A) flow of waier out of a cel B) pumping of water into a cell C) flow of water between cells D) both A and B E) both A and C 31. Water conservation in plants is assisted by A) the cuticle B) transpiration C) stomata D) clia E) both A and C 32. The haploid stage in a plant life cycle is called A) zygote B) embryo C) gametophyte D) sporophyte E) conspicuous stage 33. A swim bladder allows a fish to A) regulate its water content in seawater B) regulate its salt content in seawater C) regulate its salt content in freshwater. D) control Its buoyancy in water C) tolerate changes in water pressure 34. The monotremes are classified as mammals because they A) are endoderms B) are carnivores C) are omnivores D) have mammary glands. E) give birth to live young rather than lay eggs 35. A Characteristic of hominids is A) larger brain B) blpedalism C) nighttime activity D) monogamy E) both A and B 36. Most Cnidarians A) exist only as medusa in their life cycle 8) exist only as polyps in their life cycle C) encyst when they encounter adverse environmental conditions. D) alternate between a polyp and a medusa during their life cycle E) none of the above.Explanation / Answer
29)Answer is option B
The main difference between between protostomes and deuterostomes is the development of blastopore.
In protostomes,(blastopore develops into mouth.)
In deuterostomes,blastpore develops into anus.
Protostomes show (determinate) clevage,as the fate of all cells are predefined and predetermined.
In total spiral and determinate clevage.it is typical in protostomes in which upper cells are placed on cell junctions of lower cells,so the cells in the blastomere spiral around vertical axis.
Schizocoelom occurs by splitting mesodermal embryonic tissue in coelom.commonly seen in phylum mollusca,annelida,arthropoda.
30) osmosis is spontaneous movement of solvent molecules from low concentrated solution to high concentrated solution of solute by crossing semipermeable membrane.
It is a passive process.
-Answer is option E
As I said earlier it is passive process,
In A,flow of water out of cell is a passive one through cellmebrane. So,osmosis is seen.
In B, pumping of water into cell,external pressure is applied,which is equivalent to applying energy.so it is an active process.so,not osmosis.
In C, flow of water between cells.it is a passive process which occurs along concentration gradient.so osmosis is seen.
31)Answer is option E
Cuticle and stomata are both used in conservation of water.
A waxy cuticle reduces water loss by transpiration.
If stomata are open all the time,water will diffuse into environment due to humidity.stomata close to prevent water diffusion.
32)Answer is option C.
Gametophyte is the muliticellular,haploid stage wheras sporophyte is diploid stage.
33)Answer is option D
Swim bladder is the internal organ of some fish,which is filled with gas.
It is seen in many bony fishes ,which helps them stay afloat by providing buoyancy.
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