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What is the primary role of mycorrhizae in plant interaction?
The NCERT text mentions, 'the mycorrhizae are associations between fungi and the roots of higher plants. The fungi help the plant in the absorption of essential nutrients from the soil while the plant in turn provides the fungi with energy-yielding carbohydrates.'
In which ecological interaction does one species benefit, while the other is harmed?
The summary states 'predation and parasitism (one benefits and the other suffers)'. This translates to one species benefiting and the other being harmed.
The interaction between species where both suffer damage is known as:
As per the NCERT summary, 'competition (both species suffer)' is the definition of this interaction.
The process where predators help keep prey populations under control, preventing them from achieving very high densities that could lead to ecosystem instability, is a significant ecological role of predation. This is highlighted by the example of:
The NCERT states, 'The prickly pear cactus introduced into Australia in the early 1920’s caused havoc... Finally, the invasive cactus was brought under control only after a cactus-feeding predator (a moth) from its natural habitat was introduced into the country.'
Which of the following is characterized by one species being harmed, while the other remains unaffected?
The NCERT summary defines 'amensalism (one is harmed, other unaffected)'.
In the context of population interactions, assigning a '+' sign for beneficial, '-' for detrimental, and '0' for neutral, which interaction correctly represents $(+, 0)$?
The NCERT states, 'Commensalism (one benefits and the other is unaffected)', which corresponds to a $(+, 0)$ interaction.
Brood parasitism, where the parasitic bird lays its eggs in the nest of its host and lets the host incubate them, is exemplified by the interaction between:
The NCERT describes, 'brood parasitism in action' in the context of 'the movements of the cuckoo (koel) and the crow in your neighborhood park during the breeding season'.
In an ecological community, why is it considered inconceivable for a single species to exist in isolation without interacting with other species?
The NCERT states, 'Even a plant species, which makes its own food, cannot survive alone; it needs soil microbes to break down the organic matter in soil and return the inorganic nutrients for absorption. And then, how will the plant manage pollination without an animal agent?'
Which of the following represents the general formula for diazonium salts?
According to the NCERT text, 'The diazonium salts have the general formula $ ext{R} ext{N}_2^+ ext{X}^-$ where R stands for an aryl group and $ ext{X}^-$ ion may be $ ext{Cl}^-$, $ ext{Br}^-$, $ ext{HSO}_4^-$, $ ext{BF}_4^-$, etc.'
Which of the following is NOT a common anion found in diazonium salts?
The NCERT text states that the $ ext{X}^-$ ion in diazonium salts 'may be $ ext{Cl}^-$, $ ext{Br}^-$, $ ext{HSO}_4^-$, $ ext{BF}_4^-$, etc.' $ ext{OH}^-$ is not listed as a common anion in the general formula, although it can replace the diazo group in a reaction.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.