EVERYDAY SCIENCE

Detailed explanation-1: -Compared with cotyledons, true leaves of castor bean had higher NPQ values under salinity-alkalinity stress. This result suggests that true leaves have a stronger heat dissipation ability to better protect the photosynthetic apparatus.

Detailed explanation-2: -Cotyledons are known as “seed leaves” because they emerge and turn green as the seed germinates. Cotyledons provide nutrients to the plant embryo in order to germinate and sustain themselves as a photosynthetic creature. Thus, in the seed, cotyledons symbolize a pre-designed plant.

Detailed explanation-3: -Cotyledons are the first leaves produced by plants. Cotyledons are not considered true leaves and are sometimes referred to as “seed leaves, ” because they are actually part of the seed or embryo of the plant.

Detailed explanation-4: -The first two leaves differ from the later ones because they can originate from the cotyledons of the seed, which are the first green seed leaves, as in legumes-peas, beans etc.