Practice free Biological Classification (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
One of the major components of cell wall of most fungi is
Chitin is the major component of the cell walls of most fungi. It is a long-chain polymer of a N-acetylglucosamine, a derivative of glucose. Chitin provides structural integrity and rigidity to the fungal cell wall.
Which of the following statements is wrong for viroids?
Viroids are infectious, non-protein-coding, highly structured with samll circular RNA's, which have the ability ot replicate autonomously. These contain RNA of low molecular weight and induce diseases in higher plants.
The most abundant prokaryotes helpful to human in making curd from milk and in production of antibiotics are the ones categorized as
Heterotrophic bacteria are the most abundant prokaryotes helpful to humans in making curd from milk (like Lactobacillus) and in the production of antibiotics (like Streptomyces).
The cyanobacteria are also referred to as
Cyanobacteria, also known as blue-green algae, are a group of photosynthetic bacteria that are capable of performing oxygenic photosynthesis. They are prokaryotic organisms and are often found in aquatic environments.
Which one single organism or the pair of organisms is correctly assigned to its or their named taxonomic group?
Yeast or saccharomyces cerevisiae is a fungus of class-Ascomycetes. Saccharomyces sp. are widely used in baking and brewing industries. Paramecium and Plasmodium belong to kingdom-Protista, Penicillium belongs to kingdom-fungi. Lichen is a composite organism formed from the symbiotic association of algae and fungi.
Nostoc and Anabaena are examples of cyanobacteria or blue-green algae.
Organisms called Methanogens are most abundant in a
Methanogens are present in the gut of several ruminants animals such as cows and buffaloes and they are responsible for the production of methane (biogas) from the dung of these animals. Thus, they are most abundant in a cattle yard.
Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups called
Thermophiles live in very hot places, typically form 60º to 80ºC. Many thermophiles (some eubacteria and archaebacteria) are autotrophs and have metabolisms based on sulphur. Some thermophilic archaebacteria form the basis of food webs around deep-sea thermal vents, where they must withstand extreme temperature and pressures. Archaebacteria can grow in higly acidic (pH = 0.7) and very basic (pH = 11) environments.
Consider the following four measures (A-D) that could be taken to successfully grow chick pea in an area where bacterial blight disease is common
(A) spray with Bordeaux mixture
(B) control of the insect vector of the disease pathogen
(C) use of only disease-free seeds
(D) use of varieties resistant to the disease
Which two of the above measures can control the disease?
Bacterial blight of chick pea (Cicer arietinum) is caused by bacterium Xanthomonas campestris. The ejected tissues collapse and are digested by bacteria. Rapid spread of bacterial infection occurs through vascular strand. The stems and leaves of infected plant give blighted or burnt up appearance. Control measures include rogueing; 3-year crop rotation, disease free seeds, spray of copper fungicides and antibiotics besides showing disease resistant varieties.
Bordeaux mixture is most common fungicide. It was first discovered by Millardet in 1882 at university of BOrdeaux France to control downy mildew of grapes. It is prepared by mixing copper sulphate, lime and water in the ration of 4 : 4 : 50
Bacterial leaf blight of rice is caused by a species of
Disease Causing organism
Leaf blight of rice –Xanthomonas oryzae
Red strip of sugarcane – Pseudomonas rubrilineans
Fire blight of apple – Erwinia amylovora
Early blight of potato – Alternaria solani.
Cell wall is absent in
True or rigid cell wall is absent in mycoplasma, but their cytoplasm is surrounded by a tri-laminar (triple layered), highly elastic cell membrane of about 10 nm in thickness.
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