Module: | Embryo, Seed, Fruit & Apomixis
Q96: Consider the following statements regarding the morphology of ruminate endosperm:
1. Ruminate endosperm is defined by an uneven, highly convoluted, or deeply ridged surface morphology, famously observed in the Areca nut (betel nut).
2. This specific rumination is structurally caused by the irregular, aggressive ingrowth of the seed coat or inner integument into the developing endosperm tissue.
3. The evolutionary purpose of this rumination is to actively prevent the embryo from accessing nutrients, locking the seed in permanent dormancy.
Which of the above statements is/are correct?
2. This specific rumination is structurally caused by the irregular, aggressive ingrowth of the seed coat or inner integument into the developing endosperm tissue.
3. The evolutionary purpose of this rumination is to actively prevent the embryo from accessing nutrients, locking the seed in permanent dormancy.
Which of the above statements is/are correct?
✅ Correct Answer: A
The correct option is A. Statements 1 and 2 are correct, but Statement 3 is a logical contradiction.
The endosperm generally forms a smooth, homogenous mass of nutritive tissue.
However, in about 32 angiosperm families (most classically represented by the Areca nut/betel nut in the Arecaceae family, and the nutmeg in Myristicaceae), the endosperm becomes deeply folded and chewed-looking.
This is termed ruminate endosperm.
Causally, this does not happen because the endosperm grows weirdly; it happens because the surrounding maternal tissues, specifically the inner integument or the seed coat, undergo irregular, active proliferation and physically push inwards, forcing the developing endosperm to mold around these intrusions.
Statement 3 is entirely false.
This structural rumination does not restrict the embryo.
On the contrary, by increasing the surface area of contact between the endosperm and the maternal seed coat, it actually facilitates more efficient nutrient absorption and structural integration during seed maturation.
The endosperm generally forms a smooth, homogenous mass of nutritive tissue.
However, in about 32 angiosperm families (most classically represented by the Areca nut/betel nut in the Arecaceae family, and the nutmeg in Myristicaceae), the endosperm becomes deeply folded and chewed-looking.
This is termed ruminate endosperm.
Causally, this does not happen because the endosperm grows weirdly; it happens because the surrounding maternal tissues, specifically the inner integument or the seed coat, undergo irregular, active proliferation and physically push inwards, forcing the developing endosperm to mold around these intrusions.
Statement 3 is entirely false.
This structural rumination does not restrict the embryo.
On the contrary, by increasing the surface area of contact between the endosperm and the maternal seed coat, it actually facilitates more efficient nutrient absorption and structural integration during seed maturation.