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George Palade (1953) observed ribosomes as dense particles under the electron microscope. What characteristic of ribosomes made them stand out in his observations?
The NCERT text states: 'Ribosomes are the granular structures first observed under the electron microscope as dense particles by George Palade (1953).'
Which of the following describes the interaction where one species benefits and the other is negatively affected?
According to the NCERT text, 'In both parasitism and predation only one species benefits (parasite and predator, respectively) and the interaction is detrimental to the other species (host and prey, respectively).' Therefore, parasitism fits this description.
Which of the following is a key characteristic of endoparasites compared to ectoparasites, as mentioned in the NCERT text?
The NCERT states, 'Their morphological and anatomical features are greatly simplified while emphasising their reproductive potential.' This highlights the simplification of their physical structures due to extreme specialization as endoparasites.
Brood parasitism is a fascinating example of parasitism where:
The NCERT text explicitly defines brood parasitism: 'Brood parasitism in birds is a fascinating example of parasitism in which the parasitic bird lays its eggs in the nest of its host and lets the host incubate them.'
Which of the following protozoans is a notorious malarial parasite known for its infectious spore-like stage?
Under Sporozoans, the NCERT states, 'The most notorious is Plasmodium (malarial parasite) which causes malaria, a disease which has a staggering effect on human population.'
A parasitic fungus responsible for white spots on mustard leaves belongs to which kingdom?
The NCERT text mentions, 'White spots seen on mustard leaves are due to a parasitic fungus.' The fungi constitute a unique kingdom of heterotrophic organisms.
In the context of the statement 'one organism is benefited, other is affected,' which option best explains parasitism?
The summary explicitly states, 'predation and parasitism (one benefits and the other suffers).' Therefore, 'one organism is benefited, and the other is harmed' accurately describes parasitism.
Which of the following is an example of an endoparasite that lives inside the host's body at different sites (e.g., liver, kidney, lungs, red blood cells)?
The NCERT defines endoparasites as 'those that live inside the host body at different sites (liver, kidney, lungs, red blood cells, etc.).' Plasmodium (malarial parasite) is an example of such and is explicitly mentioned as living in the red blood cells, causing malaria.
The close living arrangement between interacting species is a common characteristic shared by which of the following interactions?
The NCERT states, 'Predation, parasitism and commensalism share a common characteristic – the interacting species live closely together.'
Cuscuta is described as a parasitic plant because it:
The NCERT text mentions, 'Cuscuta, a parasitic plant without chlorophyll and leaves in the course of evolution. It derives its nutrition from the host plant which it parasitises.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.