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Specialized cells for fixing atmospheric nitrogen in Nostoc are
Heterocysts are large sized, thick-walled specialised cells which occur in terminal, intercalary or lateral position in filamentous cyanobacteria,e.g., Nostoc. They have enzyme nitrogenase and specialised to perform biological nitrogen fixation
Which one of the following is true for fungi?
Fungi lack chlorophyll, hence, they do not prepare their food by photosynthesis. They can grow where organic material is available. So, they are heterotrophs that acquire their nutrient by absorption and store in the form of glycogen
Which of the following are likely to be present in deep seawater ?
Archaebactera live in some of the most harsh habitats such as extreme salty areas (halophiles), hot springs(thermoacidophiles) and marshy areas (methanogens)and in deep sea water
Which one of the following pairs is correctly matched ?
Tobacco Mosaic Virus (TMV) has
What is common about Trypanosoma, Noctiluca, Monocystis and Giardia ?
Malignant tertian malaria is due to
Virus envelope is known as:
Virus envelope is known as capsid. The capsid is composed of protein sub units called capsomere
Which one is the wrong pairing for the disease and its causal organism?
Late blight is caused by the fungus Phytophthora infestans. Late blight appears on potato or tomato leaves as pale green, water-soaked spots, often beginning at leaftips or edges.
In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea?
A domain of prokaryotic organisms containing the archaebacteria including the methanogens, which produce methane; the thermoacidophilic bacteria, which live in extremely hot and acidic environments, & thehalophilic bacteria, which can only function at high salt concentrations are abundant in the world’s oceans.