ANIMAL REPRODUCTION AND DEVELOPMENT
ASEXUAL REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When they are inside a dying host organism
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When they are in an environment with harsh conditions
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When they are in an environment with favorable conditions
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When the existing organism is dying
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Detailed explanation-1: -In plants, spores are usually haploid and unicellular and are produced by meiosis in the sporangium of a diploid sporophyte. Under favourable conditions the spore can develop into a new organism using mitotic division, producing a multicellular gametophyte, which eventually goes on to produce gametes.
Detailed explanation-2: -Endospore formation is usually triggered by a lack of nutrients, and usually occurs in gram-positive bacteria. In endospore formation, the bacterium divides within its cell wall, and one side then engulfs the other. Endospores enable bacteria to lie dormant for extended periods, even centuries.
Detailed explanation-3: -Spore forming bacteria withstand extreme conditions of starvation, acidity, temperature, and desiccation by producing resistant forms called “spores.” Spores are unaffected by high-temperature treatment and can germinate under favorable conditions, which may subsequently cause problems.
Detailed explanation-4: -Which of the following is a characteristic of bacterial spores? They consist of a hard, thick-walled capsule, they represent a resting and protective stage, they are more resistant to heat, they usually cannot be killed by disinfectants.