Question

Assertion: In some flowers like lily, perianth is a term used when calyx and corolla are not distinct.
Reason: Calyx and corolla are the reproductive organs.
(a) Both assertion and reason are correct and reason is the correct explanation for assertion.
(b) Both assertion and reason are correct but reason is not the correct explanation for assertion.
(c) Assertion is correct but reason is incorrect
(d) Both assertion and reason are incorrect

Answer 1

Hint: A perianth is the non-reproductive part of a flower. The perianth forms an envelope-like structure around the reproductive parts of the flower.

Complete Answer:
The envelope-like structure of the perianth consists of the calyx and the corolla. The perianth is a sterile, tube-like structure that surrounds the female reproductive parts of mosses and liverworts.
The perianth is of two types in flowering plants. The perianth is classified as dichlamydeous or heterochlamydeous when the calyx and corolla are clearly and visibly separated. The perianth is also classified as homochlamydeous when the calyx and corolla are indistinguishable from each other.
The calyx which is also known as sepals is a part of flowering plants called angiosperms. The calyx usually performs the function of protecting the flower located in the bud. The calyx also acts as a support to the petals when they are in full bloom.
The calyx is the outermost whorl of the flower of an angiosperm. The sepals are collectively known as the calyx.
The corolla which is also known as the petals of a flower are a type of modified leaves that surround the reproductive parts of the flower. The corolla is usually bright in colour and is differently shaped to attract pollinators towards the flower.

Therefore the assertion is correct but the reason is correct. Hence, the correct answer is option (c) Assertion is correct but reason is incorrect.

Note:
The sepals and petals in a homochlamydeous perianth are collectively referred to as tepals.
Most flowering plants have no use for the calyx after flowering and it becomes a vestigial part of the plant.
The petals are collectively known as the corolla.