Question

In catkin, the flowers are?
A. Unisexual and sessile
B. Bisexual and sessile
C. Unisexual and pedicellate
D. Bisexual and pedicellate

Answer 1

Flower is also known as blossom and it is the reproductive structure of the plant. The biological function of a flower is for reproduction by facilitating the union of sperm with the egg. The flower colour attracts many birds and insects for pollination which is very important.

Complete answer: Unisexual and sessile: The unisexual means flowers which have an only male or female part and sessile being flowers who have no stalks. Example- Catkin.
Bisexual and sessile: The flowers that have both male and female parts in the same flower. An example is a spike.
Unisexual and pedicellate- The flowers that have stalk are called pedicellate. An example is oak.
Bisexual and pedicellate- the example is rose.
Hence the answer is option A, i.e., unisexual, and sessile.
Additional information:
Catkin bearing plants include many types of trees and shrubs such as willow, birch, sweet chestnut, etc. And many of these plants have only male flowers as catkin and female flowers are single like a cone in a few of the plants male and female flowers are borne on catkin. Catkin flowers are seen usually in the month of winter and they even can occur during December. A catkin is a spike in which all the flowers are of only one sex, either staminate or carpellate. The catkin is usually pendulous, and the petals and sepals are reduced to aid in wind pollination when the inflorescence as a whole is shed. An example of a catkin is found in oaks.

Note: Catkin inflorescence is a compact string-like structure and has only one single main axis on which unisexual subsessile flowers are borne the flowers are clustered in a spiral shape arrangement. This type of inflorescence can be seen on many trees, particularly trees of northern temperate regions.