NEET 2024 question paper with solutions

Statement A claims Vallisneria flowers are colourful and produce nectar. Vallisneria is actually water-pollinated (hydrophilous), so, like most such plants, its flowers are small and inconspicuous with no need to attract animals — this makes A false.

Statement B says water lily flowers are not pollinated by water. Water lilies are large and colourful because they rely on insects, not water, for pollination — this makes B true.

Statement C says pollen in most water-pollinated species is protected from wetting. Many hydrophilous plants have pollen with special coverings (like mucilage) that keep it from getting waterlogged and sinking — this makes C true.

Statement D says pollen grains of some hydrophytes are long and ribbon-like. This is seen in plants like Zostera, where the elongated shape helps the pollen travel efficiently through water currents — this makes D true.

Statement E says pollen in some hydrophytes is carried passively inside water. This is true for hydrophytes that release pollen directly into water, letting currents transport it rather than relying on any pollinator — this makes E true.

So the correct statements are B, C, D, and E.

Hence, the answer is Option D: B, C, D and E only.

Recall the source of Cocaine — it is derived from the coca plant, Erythroxylum coca, so A → III.

Recall the source of Heroin — it is derived from the opium poppy, Papaver somniferum, so B → IV.

Recall the use of Morphine — although also derived from Papaver somniferum, it is specifically known as an effective sedative used in surgery, so C → I.

Recall the source of Marijuana — it is derived from the plant Cannabis sativa, so D → II.

Hence, the correct matching is A-III, B-IV, C-I, D-II (Option D).

Key idea: a bare piece of DNA carrying only the gene of interest, with no origin of replication of its own, cannot copy itself independently inside a foreign cell.

This immediately rules out statement A (independent multiplication) and statement E (ability to replicate on its own), since both require an independent origin of replication that this DNA lacks.

For the gene of interest to survive and be passed on, it typically needs to get integrated into the genome of the recipient organism — this matches statement B.

Once integrated, the alien gene becomes physically joined to the host chromosome, so it will multiply along with the host DNA and be inherited in every future generation of that cell — this matches statement C.

Statement D, which says the DNA is not an integral part of the chromosome, contradicts the successful outcome described in B and C, so it does not fit here.

Hence, the correct combination is B and C only, so the correct answer is C.