SECTION A QUESTION 1 Various options are given as possible answers to the follow
ID: 300383 • Letter: S
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SECTION A QUESTION 1 Various options are given as possible answers to the following questions. Choose the correct answer and write only the letter next to the question number, for example 1.1.6 d. 1.1. All viruses are: a. b. c. d. Prokaryotes unicellular and pathogens cellular in structure a cellular and non-living 1.2. the following is a list that describes viruses: I. Il. play a significant role as decomposers are the major pathogens of humans I. are obligate parasites IV. reproduce within host cells From the list above, which of the following are of biological importance in viruses? a. , ii and ii b. ii, ii and iv c. i, iii and iv d. i and iv only 1.3.Bacteria reproduce sexually only b. a. by binary fission by fragmentation c. d. inside living host cells only 1.4.Bryophytes are terrestrial plants that have no: a. Cellulose b. vascular tissue c. rhizoids d. sporophyte phase 1.5. Leaves that bear sporangia are called: a. Sori b. Ones ?. Sporophylls QUESTION 2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number 2.1.An organism that consists of a nucleic acid surrounded by a shield of protein 2.2.A disease-causing organism such as bacteria 2.3.A ripened ovule after the ovum within it has been fertilisecd 2.4. The hard, resistant outer wall of a pollen grain 2.5. A nutritional relationship in which two different organisms live together 2.6. An organism's resistance to foreign substancesExplanation / Answer
1.1.d
Viruses are acellular and non living. They do have a genetic material but cannot replicate it own their own, they hijack the cellular machinery of the host to replicate.
1.2.b
Viruses infect human and cause a never of diseases like influenza, HIV etc. Since they depend entirely on the host cell's machinery for their replication they are obligate parasites. they reproduce and assemble within the host cell and through exocytosis or cell lysis more viruses are released to infect other cells.
1.3. b
A single bacteria gives rise to two daughter cells, this method of replication is called binary fission.
1.4. b.
Bryophytes dont have vascular system, they are mosses, liverworts etc. They only have conduction type cells
1.5.c. sporophylls, they are of two types microsporophylls and megasporophyll
2.1. virus
2.2. pathogen; baceria, viruses, protozoa they all cause diseases and are called pathogens
2.3. seed; ovum becomes the fruit and ovules become the seeds
2.4. exine; exine is made of sporopollenin which makes it resistant to environment hazards
2.5. symbiosis, like a leguminous plant and nitrogen fixation bacteria
2.6. immunity. Immune system of an organism enables the organism to protect itself from harmful foreign antigens.
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