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The Monarch butterfly's defense against its predators is an example of:
The text explains, 'The Monarch butterfly is highly distasteful to its predator (bird) because of a special chemical present in its body. Interestingly, the butterfly acquires this chemical during its caterpillar stage by feeding on a poisonous weed.'
The weed Calotropis growing in abandoned fields produces highly poisonous cardiac glycosides. This is an example of a plant's defense against:
The context states, 'Many plants produce and store chemicals that make the herbivore sick when they are eaten... The plant produces highly poisonous cardiac glycosides and that is why you never see any cattle or goats browsing on this plant.' This clearly indicates a defense against herbivory.
In a broad ecological context, how are herbivory and predation related?
The text mentions, 'Although animals eating plants are categorised separately as herbivores, they are, in a broad ecological context, not very different from predators.' And later, 'For plants, herbivores are the predators.'
Biological control methods for agricultural pests often rely on the principle of:
The text states, 'Biological control methods adopted in agricultural pest control are based on the ability of the predator to regulate prey population.' This is exemplified by the control of the prickly pear cactus by a moth.
Which interaction is characterized by one species benefiting and the other being harmed?
The table and text clearly define predation as an interaction where '+' (benefit) and '-' (harm) occur. '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).'
The statement 'All animals depend on plants (directly or indirectly) for their food needs' suggests that:
The statement highlights the foundational role of plants (producers) in fueling ecosystems. Animals (consumers) derive their energy either directly from plants (herbivores) or indirectly by consuming other animals that ate plants (carnivores). This places plants as the base of the food chain.
Which of the following statements correctly defines a carbohydrate according to chemical properties?
The NCERT text states: 'Chemically, the carbohydrates may be defined as optically active polyhydroxy aldehydes or ketones or the compounds which produce such units on hydrolysis.' This definition aligns with option o1.
Acetic acid (CH$_3$COOH) has the molecular formula C$_2$(H$_2$O)$_2$. Why is it NOT classified as a carbohydrate, despite fitting the general formula C$_x$(H$_2$O)$_y$?
The NCERT text mentions acetic acid (CH$_3$COOH) fits the formula C$_2$(H$_2$O)$_2$ but is 'not a carbohydrate.' The chemical definition of carbohydrates states they are 'optically active polyhydroxy aldehydes or ketones or the compounds which produce such units on hydrolysis.' Acetic acid is a carboxylic acid, not a polyhydroxy aldehyde or ketone, and it does not yield such units on hydrolysis.
Which of the following is an example of a monosaccharide?
The NCERT text classifies carbohydrates into monosaccharides, oligosaccharides, and polysaccharides. Under monosaccharides, it lists 'Some common examples are glucose, fructose, ribose, etc.' Sucrose and lactose are listed as disaccharides (a type of oligosaccharide), and starch is a polysaccharide.
What is the primary characteristic that differentiates oligosaccharides from monosaccharides?
The NCERT text states: 'A carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone is called a monosaccharide.' For oligosaccharides, it says: 'Carbohydrates that yield two to ten monosaccharide units, on hydrolysis, are called oligosaccharides.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.