Question

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by
A. Bat
B. Water
C. Bee
D. Wind

Answer 1

Hint:The word, Pollination is defined as transfer of pollen from a male part of a plant to a female part of a plant, that later enables fertilisation and the production of seeds. Pollinating agents can be animals like insects, birds, and bats; water; wind; and also can be plants in case of self-pollination within a closed flower. It's important to note that pollination often occurs within species and it can produce hybrid offspring in nature.

Complete answer:
As we already know, Pollination in flowering plants is referred as the transfer of a pollen grain which have male gametophyte, to a flower’s stigma which is receptive surface of the female reproductive organ, where it germinates and grow throughout the style, and reach ovule and it gets fertilized to produce a seed
Keep in mind, A pollinator is the agent that transfers the pollen to stigma. They range from physical agents, especially the wind (anemophily), or biotic agents like insects, birds, bats and other animals (pollination by insects is termed as entomophily ,by bats as chiropterophily and by birds as ornithophily).
So, in short, remember that Wind pollinated flowers consist of a single ovule in the ovary and the flowers are packed into an inflorescence. Pollen which are lightweight and non-sticky easily disperse from anther to stigma of the flower by wind. In the case of corn cob the pollens are being packed in inflorescence.

Additional information:
Key point is, Pollination do not necessarily always result in fertilization of the ovules in the flower's ovary. Self-compatibility is needed if self-pollination is to be fruitful.

Therefore, the correct answer is option D.

Note:- Remember always, when pollination is carried out by birds, it is termed as "Ornithophily." Hummingbirds, sunbirds, honeycreepers, spiderhunters, and honeyeaters are the most common species of birds which pollinate.