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Question #47527
The Question
A researcher applies colchicine to the apical meristem of a diploid angiosperm, successfully inducing tetraploidy in the developing floral branches. This tetraploid female flower is then pollinated by pollen from a normal diploid plant of the same species. Which of the following represents the correct ploidy levels of the resulting zygote, primary endosperm nucleus (PEN), and antipodal cells, respectively?
Options
- A.
3n, 5n, 2n
- B.
4n, 6n, 4n
- C.
3n, 4n, 2n
- D.
3n, 5n, 4n
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Gymnosperm Pollination Geometry|Plasma Proteins and Osmotic Pressure|Micropylar Fluid
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse the ploidy of gametophytic cells (like antipodals) with the surrounding maternal sporophytic tissue (nucellus/integuments).
While the maternal tissue is 4n, the embryo sac cells are products of meiosis and are therefore 2n.
Furthermore, calculating PEN requires adding two polar nuclei and one male gamete (2n + 2n + n = 5n).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Plant Kingdom - Class 11 |
| Concept | Gymnosperm Pollination Geometry |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |