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What is the term for substances that trigger an allergic immune response?
The text defines it as: 'The substances to which such an immune response is produced are called allergens.'
Which of the following plant species, introduced as a contaminant, has become a significant cause of pollen allergy in India?
The section on Sexual Reproduction in Flowering Plants mentions: 'It may be mentioned that Parthenium or carrot grass that came into India as a contaminant with imported wheat, has become ubiquitous in occurrence and causes pollen allergy.'
How can the cause of an allergy be determined according to the text?
The text describes the process: 'For determining the cause of allergy, the patient is exposed to or injected with very small doses of possible allergens, and the reactions studied.'
Which of the following drugs quickly reduce the symptoms of allergy?
The text states: 'The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy.'
The ability of higher vertebrates to differentiate foreign organisms from self-cells is a basis for:
The section 'Auto Immunity' starts by saying: 'Memory-based acquired immunity evolved in higher vertebrates based on the ability to differentiate foreign organisms (e.g., pathogens) from self-cells.'
An auto-immune disease occurs when the body attacks which of the following?
The text explains: 'sometimes, due to genetic and other unknown reasons, the body attacks self-cells. This results in damage to the body and is called auto-immune disease.'
Which of the following statements about apomixis is INCORRECT?
The NCERT text states: 'Although seeds, in general are the products of fertilisation, a few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilisation, called apomixis.' Therefore, apomictic seeds are not generally a result of fertilization, but rather formed without it.
Polyembryony, the occurrence of more than one embryo in a seed, is observed in which of the following plants according to the provided text?
The text mentions: 'More often, as in many Citrus and Mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into the embryos. In such species each ovule contains many embryos. Occurrence of more than one embryo in a seed is referred to as polyembryony.'
In apomixis, what is the fate of the reduction division (meiosis) in the formation of the egg cell?
The NCERT text states: 'In some species, the diploid egg cell is formed without reduction division and develops into the embryo without fertilisation.' This indicates that reduction division is sometimes absent.
Which of the following events is bypassed in the formation of an apomictic seed?
Apomixis is defined as a 'special mechanism, to produce seeds without fertilisation'. All other options are generally outcomes or parts of seed development that can occur even in apomixis.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.