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Question
In the embryos of a typical dicot and a grass, true homologous structures are:
In the embryos of a typical dicot and a grass, true homologous structures are:
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Solution
The correct option is D Cotyledons and scutellum
Embryo of a typical dicot
* Embryo of dicots is made up of two cotyledons and an embryonal axis that is divided into epicotyl and hypocotyl.
* Epicotyl is the region above the cotyledons and it gives rise to the shoot tip, known as plumule.
* Hypocotyl is the region below the cotyledons and it gives rise to the root tip known as the radicle and root cap.
Embryo of grass-monocot.
* Embryo of grass or monocots is made up of only one cotyledon called scutellum that lies laterally on the embryonal axis.
* Epicotyl bears a structure called coleoptile that consists of shoot tip and leaf primordia.
* Hypocotyl bears an undifferentiated structure called coleorhiza that covers the root tip- radicle and root cap.
Homologous structures
True homologous structures in the embryos of a typical dicot and a grass are cotyledons and scutellum, because the cotyledon is named scutellum in grass. Function of cotyledon and scutellum is to store reserve food.
Final answer
c. cotyledons and scutellum
Embryo of a typical dicot
* Embryo of dicots is made up of two cotyledons and an embryonal axis that is divided into epicotyl and hypocotyl.
* Epicotyl is the region above the cotyledons and it gives rise to the shoot tip, known as plumule.
* Hypocotyl is the region below the cotyledons and it gives rise to the root tip known as the radicle and root cap.
Embryo of grass-monocot.
* Embryo of grass or monocots is made up of only one cotyledon called scutellum that lies laterally on the embryonal axis.
* Epicotyl bears a structure called coleoptile that consists of shoot tip and leaf primordia.
* Hypocotyl bears an undifferentiated structure called coleorhiza that covers the root tip- radicle and root cap.
Homologous structures
True homologous structures in the embryos of a typical dicot and a grass are cotyledons and scutellum, because the cotyledon is named scutellum in grass. Function of cotyledon and scutellum is to store reserve food.
Final answer
c. cotyledons and scutellum
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