Question

Tertiary roots are
(A) Positively geotropic
(B) Negatively geotropic
(C) Plagiogeotropic
(D) Ageotropic

Answer 1

The major root develops horizontally into the soil. On the most important root, smaller lateral roots recognized as the secondary roots are formed. Tertiary roots are formed by way of secondary roots in turn. Such roots grow in one-of-a-kind instructions and assist to restore the plant securely in the soil.

Complete answer:
The tertiary root system consists of two or greater genetically and functionally different root groups, smaller than 0.6 mm in diameter, which have an effect on the performance observed in developed root systems.

The lateral roots are none different than roots that develop horizontally from the radical primary root and help to exactly anchor the plant in the soil. This branching is imperative for the absorption of water, promoting the uptake of nutrients. The secondary and tertiary roots incorporate lateral roots. Tertiary roots are viewed as the branches of the secondary roots. There is little or no geotropic sensitivity in some of the lateral organs. It is, therefore, referred to as being ageotropic.

An instance of such a plant: the Cycas of the coralloid root. The taproot is the primary root that grows from the embryo's radicle elongation and remains in the course of the plant's existence. This produces lateral or secondary roots that further wreck to form tertiary roots.

Hence, the correct answer is option ‘D’ i.e, autotrophic.

Note: The predominant root that persists as the main root at some stage in the life of a plant and grows straight downwards in the soil is the taproot. Other branches originate from the taproot, such as secondary roots, tertiary roots, rootlets, and so forth are examples of the taproot system. Most generally, the taproot system is present in dicots. Mangifera, Azadirachta, Gossypium, for instance, etc.