Question

Arrange the following sentence given below in the correct sequence describing the process of sexual reproduction in a flowering plant.
P: Fertilisation takes place
Q: Pollen grains are released
R: A fruit with seeds develop
S: The stigma receives pollen grains
T: Pollen tubes grow towards the ovules
Options
A. Q → S → P → T → R
B. Q → S → T → P → R
C. R → Q → S → P → T
D. T → Q → S → P → R

Answer 1

Hint:- Sexual reproduction in flowering plants takes place by the involvement of both male and female gametes which further forms zygote after fusion. The process of pollen grains getting deposited on stigma is known as pollination. Pollen grains are called male gametophytes carrying male gametes which stick to the stigma and travel inside the ovule where the female gamete is present, and their fusion takes place.

Complete step-by-step solution:-
In sexual reproduction the pollen grains are transferred to the stigma in three different types of process or we can say three different types of pollination occur, those are autogamy, geitonogamy and xenogamy. Pollen grains are released by anthers and get sticks to the upper part of the carpel called stigma hence the stigma receives the pollen grains and pollination takes place. After the pollination is completed the journey of pollen grain starts from stigma to carpel towards the ovule for the fusion. Once the pollen grain reaches inside the ovule fertilisation takes place and the male gametophyte or pollen grain fuses with female gamete or egg as a result zygote and endosperm are formed. After fertilisation, the ovule develops into seed and the ovary develops into fruit. Hence the sequence of above mentioned process of reproduction in flowering plants goes with the option (B) Q → S → T → P → R.

Note:- Autogamy is the term referring to the pollination in which pollen grain of flower sticks with the stigma of the same flower, self-pollination.
Geitonogamy refers to the pollination in which pollen grain of a flower sticks with the stigma of another flower of the same plant.
Xenogamy refers to the pollination in which pollen grain of a flower from different plants sticks with stigma of flowers from different plants which are even genetically different.