Question

Fruit of citrus is technically
(a)Hesperidium
(b)Pome
(c)Pepo
(d)Berry

Answer 1

Hint: Citrus fruits have endocarp with a sub-epidermal juicy hair. They have a spongy white mesocarp and leathery epicarp, with oil glands. It is fruit inside a separable rind with sectioned pulp. For citrus fruit the example is lemon.

Complete answer:
Hesperidium is a multi-chambered, seeded fleshy fruit produced from the multidisciplinary, synchronous, and superior ovary. The epicarp is thin and smooth, leathery, and glandular e.g., lemons and oranges.
Pome is a fruit developed from the thalamus.
Pepo is a berry with an edible mesocarp, endocarp, and placenta and a hard epicarp.
Berry is a fleshy, edible fruit with a pericarp.

Additional Information: The largest citrus fruit is the pomelo, sometimes called Chinese grapefruit, thick-skinned with a rind that is popular for cooking and marmalades.
A good example of a pepo is the watermelon, a berry with a hard, thick rind. Citrullus lanatus is a "yellow watermelon" triploid and seedless. Although it is sold as "seedless," the fleshy interior contains some seeds.
Although tomato is known as a "vegetable," it is technically a botanical fruit known as a berry. The bulk of a true berry’s inner tissue is soft and fleshy.
A fleshy fruit with thin skin and a stony endocarp seed within constitutes the drupe.

So, the correct answer is 'Hesperidium'.

Note: The name citrus derived from the Greek word for cedar, perhaps due to similar odors. Citrus fruits are known as agrumes, meaning roughly 'sour fruits." The majority of citrus fruits come from a small group of plants that are probably derived from about four species in Southeast Asia. Oranges, grapefruits, tangerines, limes, and lemons are the most common.