Question:
Which one of the following is the correct description for a mature embryo sac?
Which one of the following is the correct description for a mature embryo sac?
Show Hint
Remember the 8-7 rule for angiosperms: 8 "N"uclei in 7 "C"ells.
Updated On: May 4, 2026
- 7 nuclei and 8 cells
- 8 nuclei and 8 cells
- 8 nuclei and 7 cells
- 7 nuclei and 7 cells
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Concept
The female gametophyte or embryo sac in angiosperms typically develops through a process called megasporogenesis and megagametogenesis.
Step 2: Meaning
A mature embryo sac is the structure within the ovule where fertilization occurs, containing the egg cell and associated nuclei.
Step 3: Analysis
During development, the functional megaspore undergoes three sequential mitotic divisions of the nucleus without immediate cytokinesis. This results in 8 nuclei. Eventually, cell walls are laid down around six of the nuclei, forming three cells at the micropylar end (egg apparatus) and three at the chalazal end (antipodals). The remaining two nuclei (polar nuclei) stay in a large single central cell.
Step 4: Conclusion
This distribution results in a structure that has 8 nuclei contained within 7 distinct cells. Final Answer: (C)
The female gametophyte or embryo sac in angiosperms typically develops through a process called megasporogenesis and megagametogenesis.
Step 2: Meaning
A mature embryo sac is the structure within the ovule where fertilization occurs, containing the egg cell and associated nuclei.
Step 3: Analysis
During development, the functional megaspore undergoes three sequential mitotic divisions of the nucleus without immediate cytokinesis. This results in 8 nuclei. Eventually, cell walls are laid down around six of the nuclei, forming three cells at the micropylar end (egg apparatus) and three at the chalazal end (antipodals). The remaining two nuclei (polar nuclei) stay in a large single central cell.
Step 4: Conclusion
This distribution results in a structure that has 8 nuclei contained within 7 distinct cells. Final Answer: (C)
Was this answer helpful?
0
0
Top TS EAMCET Biology Questions
- Arrange the following steps in the order of their occurance in the lytic cycle of a phage i) Maturation phase ii) Penetration phase iii) Attacinnenr iv) Release phase v) Biosynthesis The correct sequence is
- In gel electrophoresis, DNA molecules can be separated by forcing them to move towards the anode under an electr ic field through a matrix. This is because DNA fragments are positively charged. Which of the following is true?
- Which of the following has ATP-ase activity in flagella
- Match the following lists: The correct answer is
- Study the following lists : The correct answer is
View More Questions
Top TS EAMCET Questions
- A bag contains $5$ red balls, $3$ black balls and $4$ white balls are drawn at random. The probability that they are not of same colour is
- If $cosec\, \theta - \cot \theta = 2017$, then quadrant in which $\theta $ lies is
- If $a$ is a unit vector, then $| a \times \hat{ i }|^{2}+| a \times \hat{ j }|^{2}+| a \times \hat{ k }|^{2}=$
- $A$ straight line makes an intercept on the $Y$-axis twice as long as that on $X$-axis and is at a unit distance from the origin. Then the line is represented by the equations
- Let $S$ and $S'$ be the foci of an ellipse and B be one end of its minor axis. If $SBS'$ is an isosceles right angled triangle then the eccentricity of the ellipse is
View More Questions