Multiple Choice QuestionsWhich one of the following natural polymers is found both in insects and fungi?
Pectin
Chitin
Cellulose
Suberin
Which one of the following antibiotics kills bacterial cells by inhibiting the polymerisation of peptidoglycan?
Aminoglycosides
Fluoroquinolones
Quinines
Penicillins
Which one of the following organisms is not used as a biocontrol agent?
Bacillus sphaericus
Trichoderma viride
Bacillus thuringiensis
Bacillus subtilis
Which one of the following insecticides is of plant origin?
Ecdysone
Rotenone
Parathion
Malathion
B.
Rotenone
Rotenone is an odourless, colourless crystalline ketonic chemical compound used as a broad- spectrum insecticide, piscicide and pesticide. It occurs naturally in the seeds and stems of several plants, such as the jicama vine plant and the roots of several members of Fabaceae.
Ecdysone is a steroidal prohormone of the major insect molting hormone 20-hydroxyecdysone, which is secreted from the prothoracic glands. Insect molting hormones (ecdysone and its homologues) are generally called ecdysteroids.
Parathion is a highly toxic cholinesterase inhibitor that is used as an acaricide and as an insecticide.
Malathion is an insecticide in the chemical family known as organophosphates.
Curdling of milk in small intestine occurs due to the action of
trypsin
erypsin
rennin
chymotrypsin
A simple technology has been developed in India for plant breeders and farmers to use two plants as biofertilizers for growing rice. These are
Azotobacter and Rhizobium
Chlorella and Spirulina
Azolla and nitrogen fixing blue-green algae
Riccia and Marchantia
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