CBSE
Multiple Choice QuestionsAssertion : Neurospora is commonly called water mould.
Reason : It belongs to basidomycetes fungi.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
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
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
Thermococcus, Methanococcus and Methanobacterium exemplify
bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
bacteria that contain a cytoskeleton and ribosomes
archaebacteria that contains protein homologous to eukaryotic core histones
archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
Assertion: The primary protenema of moss by death and decay of cells may break into fragments.
Reason: Each fragment gives rise to leafy gametophyte.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
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
Assertion: Protoplasmic continuity is maintained in perforated septum.
Reason: Usually a small pore remains in the centre of the septum.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Intermediate host is absent in the infection of
Plamosdium
Trypanosoma
Entamoeba
Filarial worm
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
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.
