The plants dependent on insects for pollination attract insects by releasing …........
A. Sucrose
B. Fructose
C. Glucose
D. Galactose

Hint: Entomophily is essentially the type of pollination, wherein, pollen or spores are distributed by insects. Several insects are reported to be liable for the pollination of many plant species; particularly bees, wasps, flies, ants, and beetles.

Complete answer: A pollinator is an animal that displaces pollen from the male anther of a flower to the female sex organ of the plant i.e. the stigma of a flower.
1. This helps to bring about fertilization of the ovules within the flower by the male gametes.
2. Plants have evolved and adapted to several ways for attracting pollinators.
3. These methods include providing stimulus such as a strong odor, rewards such as pollen grains and nectar, mimicry, and so on.
4. Nectar is one of the most prominent substances secreted by flowers to attract insect pollinators.
5. It largely consists of a sugar-rich fluid (major part is composed of sucrose) produced by plants in typical nectar glands (known as nectarines).

So, the correct answer is option A. Sucrose.

Note: Many pollinators have evolved specialized structures and behaviors to help in plant pollination like the fur on the face of the black and white ruffed lemur or a bat.
Animal pollinated flowering plants produce pollen that's sticky and barbed in order to stick to the animal and thus be transferred to a new flower (cross-pollination) or a different flower of the same plant (self-pollination).