Biology : Biological Classification

Based on cellular mechanisms there are two major types of regeneration found in the animals. Which one of the following is the correct example of the type mentioned?

• Morphallaxis - Regeneration of two transversely cut equal pieces of a Hydra into two small Hydras

• Epimorphosis - Replacement of old and dead erythrocytes by the new ones

• Morphallaxis - Healing up of a wound in the skin

• Epimorphosis - Regeneration of crushed and filtered out pieces of a Planaria into as many new Planarians

Myxomycetes are

• saprobes or parasites, having mycelia, asexual reproduction by fragmentation, sexual reproduction by fusion of gametes

• slimy mass of multinucleate protoplasm, having pseudopodia-like structures for engulfing food, reproduction through fragmentation or zoospores

• prokaryotic organisms, cellular or acellular, saprobes or autotrophic, reproduce by binary fission
  
  

• eukaryotic, single-celled or filamentous, saprobes or autotrophic, asexual reproduction by fusion of two cells or their nuclei.

Electroporation procedure involves

• fast passage of food through sieve pores in phloem elements with the help of electric stimulation

• opening of stomata! pores during night by artificial light

• making transient pores in the cell membrane to introduce gene constructs

• purification of saline water with the help of a membrane system

The bacteria Pseudomonas aeruginosa is useful because of its ability to

• transfer genes from one plant to another

• decompose a variety of organic compounds

• fix atmospheric nitrogen in the soil

• produce a wide variety of antibiotics

Assertion : The fungi are widespread in distribution and they even live on or inside other plants and animals.

Reason : Fungi are able to grow anywhere on land, water or on other organisms because they have a variety of pigments, including chlorophyll, carotenoids, fucooxanthin and phycoerythrin.

• If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false

Viroids have

• single stranded RNA not enclosed by protein coat

• single stranded DNA not enclosed by protein coat

• double stranded DNA enclosed by protein coat

• double stranded RNA enclosed by protein coat

How many sub-phyla are available in Tracheata, according to Tippo's classification of kingdom Plantae ?

• 4

• 6

• 8

• 10

The usage of binomial names, for plant species, was accepted by all after the publication of the works by :

• Hooker

• Linnaeus

• Bentham

• Darwin

Which of the following statement about viruses is correct ?

• Viruses are obligate parasites

• Viruses contain both RNA and DNA

• Nucleic acid of viruses is known as capsid

• Viruses possess their own metabolic system

The virus, that infects bacteria, are made up of:

• Protein only

• RNA and protein

• DNA and lipid

• DNA and protein