Question

If the diploid number of an angiospermic plant is 24, the number of chromosomes in pollen grains, endosperm and integument will be:
A) 12,36,12
B) 12,24,36
C) 12,12,36
D) 12,36,24

Answer 1

Hint:Angiosperms have small pollen grains that spread genetic information from flower to flower. They include flowers who produce seeds which are enclosed within a carpel. Examples of angiospermic plants include grassed, shrubs, etc.

Complete answer:
Let’s discuss given options and find the correct answer
Each of the 3 haploid nuclei within the germinated spore grain should contain twelve chromosomes, and every of the eight nuclei among the embryo sac contain twelve chromosomes.
Pollen grains : The pollen grains are haploid in nature, therefore,
$\begin{align}
  &\Rightarrow 2n=24 \\
 &\Rightarrow n=\dfrac{24}{2}=12 \\
\end{align}$
Endosperm : Endosperm is polyploid, so it's going to have 3n chromosomes.
$\begin{align}
  &\Rightarrow n=12 \\
 & \Rightarrow 3n=3\times 12=36 \\
\end{align}$
Integument : Integument is diploid in nature, therefore, it is going to have 2n chromosomes,
$\begin{align}
  &\Rightarrow n=12 \\
 & \Rightarrow 2n=2\times 12=24 \\
\end{align}$

Hence the correct answer is option ‘D’ 12, 36, 24.

Additional information: The carpel is known as the female reproductive organ of the angiosperms. It is also known as a pistol and together with all the female parts it is known as gynoecium.

Note:
i) Angiosperms have male sex organs referred to as stamens. Stamen is also known as microsporophyll and consists of two parts - anther and filament.
ii) Filament - It's a long and slender stalk like structure
iii) Anther - It is a lobed structure present in filament and can be monothecous or dithecous