NEET2026BiologyChapterActual
Identify the incorrect statement regarding the structure of a typical mature angiosperm embryo sac.
Options
- ASix of the eight nuclei in the mature embryo sac are surrounded by cell walls and organised into distinct cell
- BThree cells are grouped together at the chalazal end of the embryo sac and constitute the egg apparatus.
- CThe synergids possess special cellular thickenings at their micropylar tip called the filiform apparatus.
- DThe large central cell is situated below the egg apparatus and contains two polar nuclei.
Correct answer
B. Three cells are grouped together at the chalazal end of the embryo sac and constitute the egg apparatus.
Step-by-step solution
In a typical mature angiosperm embryo sac, three cells are grouped together at the micropylar end to constitute the egg apparatus, which consists of two synergids and one egg cell. The three cells located at the chalazal end are called antipodals. Therefore, the statement that the egg apparatus is at the chalazal end is incorrect. Answer: Three cells are grouped together at the chalazal end of the embryo sac and constitute the egg apparatus.