BIO 102 | Study Mode

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Question 31
A
bryophytes
B
prokaryotes
C
protista
D
fungi.
Explanation
According to Whittakers system, blue green algae are placed in kingdom monera which is the kingdom of prokaryotes. This is because they lack nucleus, DNA is naked and is folded variously to form nucleoid in the centre of the protoplast. In addition they lack membrane bound organelles including endoplasmic reticulum and ribosomes are of 70s type. So they are included under prokaryotes.

Correct option: B
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Question 32
A
pseudopodia
B
nucleus
C
contractile vacuole
D
general surface
Explanation
In Amoeba and Paramecium osmoregulation occurs through contractile vacoule. Osmoregulation is a phenomenon in which contractile vacuole plays an important role in maintaining the water balance of the cell. Paramaecium contains two contractile vacuoles which have fixed position.

One contractile vacuole is present near the anterior end while another is present towards posterior end of the body. Each contractile vacuole is surrounded by 5-12 radial canals. Excess of water is transferred from the cytoplasm to the radial canals. The latter pour water into the contractile vacuole. The contractile vacuole expels water outside the body.

Thus the contractile vacuoles and radial canals are for osmoregulation. In Amoeba the endoplasm, at its posterior end, contains a single, clear rounded and pulsating contractile vacuole, filled with a watery fluid and enclosed by a unit membrane. Surrounding this membrane is a region containing many tiny feeder vacuoles and mitochondria. It helps in the osmoregulatory and excretory activities of the animal.


Correct option: C
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Question 33
A
order
B
taxonomy
C
species
D
genes.
Explanation
Taxon refers to all the categories in the taxonomic hierarchy. It may be a kingdom, class, order, family, genus or species. It is any level of grouping of organisms. Each of these categories has been divided further into intermediate categories like subkingdom, subdivision, superclass, subgenus, subspecies etc. This term was coined by ICBN in 1956.

Correct option: B
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Question 34
A
binomial nomenclature
B
theory of biogenesis
C
discovery of microscope
D
discovery of blood circulation.
Explanation
Binomial nomenclature of scientific naming was first given by C. Linnaeus (1735) in his book System a Naturae and later in Species Plantarum (1753). He used two Latin words for any organism, the first being generic name and the second is specific name. The generic name begins with capital letter and the species name with small letter.

Correct option: A
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Question 35
A
double helical DNA
B
RNA
C
single helix DNA
D
none of these.
Explanation
Influenza viruses are spherical in shape measuring about 800-1200A in diameter. It has a protein capsid that encloses a single stranded RNA. The single stranded RNA is generally linear and constitutes about 10% of the virus particle. RNA is genetic material in other viruses like poliomyelitis, foot and mouth disease virus and tobacco mosaic virus etc.

Correct option: B
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Question 36
A
Engler & Prantl
B
Bentham & Hooker
C
Bessey
D
Hutchinson.
Explanation
Bentham and Hooker in their monumental work Genera Plantarum (1862-1883) have provided elaborate keys for the easy identification of202 natural orders and genera. Engler and Prantl wrote Die naturlichen pflanzen familien. Huchinson wrote a book titled The Families of Flowering Plants.

Correct option: B
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Question 37
A
natural system
B
phylogenetic system
C
artificial system
D
synthetic system.
Explanation
There are three systems of classification artificial, natural and phylogenetic. In the natural system of classification the organisms are arranged on the basis of all known taxonomic characters instead of one or first few. These include morphological, anatomical, cytological, and physiological and biochemical characters of the organisms.

The artificial system is based on one or a few characters that are easily observable. The phylogenetic system tries to organize organisms on the basis of their genetic and phylogenetic relationships besides taxonomic characters.


Correct option: A
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Question 38
A
ss RNA
B
ds RNA
C
ds DNA
D
ss DNA.
Explanation
Cauliflower mosaic virus contain ds DNA. It is circular and shows semidiscontinuous type of replication.

Correct option: C
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Question 39
A
they require both RNA and DNA
B
they both need food molecules
C
they both require oxygen for respiration
D
both require the environment of a cell to replicate
Explanation
Viruses contain a protein coat that encloses a single type of nucleic acid, either RNA or DNA. They multiply only inside the living host cells and for this they take over the machinery of the host cell. They lack cell division and enzymes for protein synthesis. They do not have cell 01 ganclles like mitochondria, Golgi complex, lysosomes ribosomes etc. so they cannot live or reproduce separately.

Correct option: D
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Question 40
A
300 x 10 nm
B
300 x 5 nm
C
300 x 20 nm
D
700 x 30 nm
Explanation
TMV is rod shaped measuring 300 20 nm. It is made of RNA and proteins.

Correct option: C

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