EVERYDAY SCIENCE

Detailed explanation-1: -The air channels include a central canal (b), carinal canals (c), and vallecular canals (d) at the bottom of each groove. Size and shape of the air canals vary with species. This species has two forms (dimorphic). In the spring, an unbranched fertile shoot (e) emerges from the rhi-zome (f).

Detailed explanation-2: -In this region of the cortex the air spaces known as vallecular canals are also present Usually vallecular canals are found Page 2 opposite the furrows in the deeper tissue of the cortex. They are alternate to the vascular bundles. These canals are filled up with air. The endodermis is the last layer of the cortex.

Detailed explanation-3: -Answer. Explanation: vallecular canal (cortical canal) In Equisetum and some of its fossil relatives, one of a number of large, air-filled, intercellular channels running the length of each internode and positioned approximately between the vascular bundles. They lie outside and are larger than the carinal canals.

Detailed explanation-4: -noun. : one of the large intercellular passages of the cortical parenchyma alternating with the vascular bundles in the stems of plants of the genus Equisetum.

Detailed explanation-5: -The anatomy of Equisetum stems is characterized by the occurrence of vallecular and carinal canals. Previous studies on the carinal canals in several Equisetum species suggest that they convey water from one node to another.