Given below are two statements One is labelled as Assertion (A) and the other is labelled as Reason(R).Assertion (A) A typical unfertilized, angiospermembryo sac at maturity is 8 nucleate and 7-celled.Reason (R) The egg apparatus has 2 polar nuclei.In the light of the above statements, choose thecorrect answer from the options given below
Answer
Mature Angiosperm Embryo Sac
Assertion (A): True
A mature angiosperm embryo sac is 8-nucleate and 7-celled, consisting of:
- 3 antipodal cells
- 2 synergids
- 1 egg cell
- 1 central cell with 2 polar nuclei
Reason (R): False
The egg apparatus includes 1 egg cell and 2 synergids — it does not contain the 2 polar nuclei. The polar nuclei are located in the central cell.
The statement is scientifically correct, but it may be considered “false” in the context of reasoning because it doesn’t explain the assertion directly.
Component Summary
| Component | Number | Location | Function |
|---|---|---|---|
| Egg Cell | 1 | Micropylar end | Fuses with male gamete to form zygote |
| Synergids | 2 | Micropylar end | Help guide the pollen tube |
| Antipodal Cells | 3 | Chalazal end | Often degenerate; unclear function |
| Central Cell | 1 | Center | Contains 2 polar nuclei → endosperm formation |
| Total | 7 cells, 8 nuclei | — | — |