AP BIOLOGY

Detailed explanation-1: -After the cuticle we find the true tissues of the root, starting on the outside of the cross-section to the inside we find: epidermis, cortex, endodermis with Casparian strips, and the stele or vascular cylinder which is composed of pericycle, xylem and phloem (Figure 2.3. 2).

Detailed explanation-2: -The plant body of bryophytes are thallus-like and attached to a substratum by root-like structures called rhizoids. they do not have true root. Rhizoids does the function of anchoring the plant body to the substrate. Q.

Detailed explanation-3: -Roots are the main organ used by plants to absorb water and nutrients from the soil. Roots also transport water and nutrients from the soil to other parts of the plant. Roots anchor a plant to the ground and can give stability and support to the above-ground shoot system.

Detailed explanation-4: -Primary structure of monocot root Endodermis has barrel-shaped parenchyma without intercellular spaces. Casparian strips are little present but passage cells are absent. Pericycle gives lateral roots only, secondary growth is absent. Vascular bundles are radial; Xylem is an exarch, bundles more than six.