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Question

In the embryos of a typical dicot and a grass, true homologous structures are:

A
Hypocotyl and radicle.
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B
Coleoptile and scutellum
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C
Coleorhiza and coleoptile
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D
Cotyledons and scutellum
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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


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