Question

1. Which plant group(s) require water for fertilization?

   		nonvascular only
   		seedless vascular only
   		nonvascular and seedless vascular
   		all plants require water for successful fertilization

1 points   

QUESTION 79

1. The shared, derived traits of all seed plants include all of the following except:

   		ovules
   		reduced gametophytes
   		seeds
   		flowers
   		pollen

1 points   

QUESTION 80

1. Which of the following is a trait shared by prokaryotes and eukaryotes, but not by viruses?

   		nucleic acids used to store hereditary information
   		the capacity to evolve
   		the ability to process energy through metabolic reactions
   		complex and ordered arrangements of macromolecules

1 points   

QUESTION 81

1. A fish swimming into an estuary from a river would have which of the following as its greatest physiological challenge?

   		temperature change
   		change in water velocity
   		change in oxygen content of the water
   		change in salinity

Answer 1

1. The correct answer is c. nonvascular and seedless vascular. The bryophyte plants even though grow on land need water for fertilization. Bryophyte are both non vascular and seedless plant. Since they lack xylem phloem vessels and seeds.

2. The correct answer is Flower. Flower is the characteristics feature of only the angiosperms. But seeded plants includen both gymnosperms and angiosperm. In both the categories ovaries, reduced gametophyte, seeds and pollens are formed in one or the other stage but gymnosperms do not posses flower in any stage.

3. The correct answer is the ability to process energy through metabolic reactions. The virus like the eukaryote and prokaryote has nucleic acid as RNA or DNA, can evolve against host immune system and also it may have complex ordered macromolecules or protiens in body. But a virus is unable to metabolise energy independently. It is dormant when outside te host body. It can only control the host cell to metabolize energy by infecting the cell.

4. The correct answer is change in salinity. The major change that occur while migrating from river water to sea water is salinity. The river water is less saline or sweeter as compared to sea water. Other changes such as temperature, velocity of water or oxygen content may be less obsereved. But salinity change is a must transition seen.

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