AP BIOLOGY

PLANTS

ROOTS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
These roots extend horizontally from taproots
A
taproots
B
lateral roots
C
adventitious roots
D
fibrous roots
Explanation: 

Detailed explanation-1: -Lateral roots, emerging from the pericycle (meristematic tissue), extend horizontally from the primary root (radicle) and over time makeup the iconic branching pattern of root systems.

Detailed explanation-2: -In a fibrous root system, the roots grow downwards into the soil, and also branch off sideways throughout the soil. This forms a mass of fine roots, with no distinct tap root, because the embryonic root dies back while the plant is still young and growing.

Detailed explanation-3: -…the taproot are produced smaller lateral roots (secondary roots) that grow horizontally or diagonally. These secondary roots further produce their own smaller lateral roots (tertiary roots). Thus, many orders of roots of descending size are produced from a single prominent root, the taproot.

Detailed explanation-4: -A taproot system, generally found in dicotyledons, is made up of a central, large root that is called the taproot. The taproot is larger in diamater than the lateral roots. Lateral roots, which originate from the pericycle, branch off from the taproot, and subsequent lateral roots can branch off other lateral roots.

Detailed explanation-5: -Lateral roots: Lateral roots grow outwards right under the soil surface. They absorb a lot of water and nutrients as well as anchoring the tree. Oblique/heart roots: Oblique roots, also known as heart roots, grow at a diagonal and have the same function as lateral roots.

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