Reproduction In Plants

Plasticity is the ability of a plant to adapt morphologically and physiologically to environmental or internal cues.
Example: Heterophylly in cotton and coriander.

Assertion is incorrect — angiosperms undergo internal fertilization.
Reason is correct — in internal fertilization, the egg is formed and fertilized inside the female body.
Hence, only (R) is true.

Chargaff’s rules state A = T and G = C in DNA — discovered by Erwin Chargaff.

Homozygous parents have identical alleles and therefore produce one type of gamete.
Heterozygous parents produce more than one type of gamete, each carrying different alleles.

II) Correct — Volvox is a green alga that shows zygotic meiosis leading to haploid spores.
III) Correct — Cycas has siphonogamy, where the male gamete is carried through a pollen tube.
I) Incorrect — Bryophytes exhibit haplodiplontic, not diplontic or diplohaplontic life cycles.
IV) Incorrect — Mycorrhizal association is found in higher plants like Pinus, not typically in Cycas.