Tag: root modifications

Questions Related to root modifications

In many plants the tap root becomes swollen and assume various forms. Match the following.

Plant Type of Root
A. Carrot 1. Conical
B. Mirabilis  2. Fusiform
C. Radish 3. Napiform
D. Turnip 4. Tuberous
botany root - external morphology root system in plants modifications of root root modifications

  1. A - 1, B - 4, C - 2, D - 3

  2. A - 2, B - 3, C - 1, D - 4

  3. A - 4, B - 1, C - 3, D - 2

  4. A - 3, B - 2, C - 1, D - 4

Show answer
Correct Option: A
Explanation:

1.The conical fleshy tap root resembles a cone, that is, the thickest towards base and gradually tapering towards the apex, e.g., Carrot (Daucus carota) 2.The fusiform fleshy root is like a spindle, that is, thickest roughly in the middle and narrow towards both its base and apex, e.g., Radish (Raphanus sativus). 3.The napiform fleshy root is very thick at the base and is almost spherical. It suddenly thins out towards the apex (top-like), e.g., Turnip (Brassica rapa ) 4.The tuberous roots are those thickened tap roots which do not assume any definite form, e.g., Mirabilis jalapa (Four O’ Clock). So, the correct option is A. (A - 1, B - 4, C - 2, D - 3)

Identify the correct pair of plants which produce pneumatophores : 

botany root - external morphology root system in plants modifications of root root modifications

  1. Heritiera fomes and Dahlia bybrida

  2. Heritiera fomes and Ceriops roxburghiana

  3. Ceriops roxburghiana and Asparagus racemosus

  4. Tinospora cordifolia and Ipomoea batatus

Show answer
Correct Option: B
Explanation:

Answer is option B i.e. "Heritiera fomes and Ceriops roxburghiana"
Pneumatophores (breathing roots) are modification of root that assist in respiration whenever there is water lodging near root. They are found in halophytes (plants which grow in saline conditions) and mangroves. In mangrove families like Heritiera fomes and Ceriops roxburghiana, pnematophores acts as an organ of gaseous exchange.

A partial (stem or root) parasitic plant is one which

botany root - external morphology root system in plants modifications of root root modifications

  1. Draws food from host only at certain times

  2. Takes both water and nutrients from host plant

  3. Takes only water from host plant

  4. Uses the host just for support

Show answer
Correct Option: B
Explanation:

Partial parasitic plants have chlorophyll which helps them to produce organic substances they require. They depend on the host for water and minerals, sometimes few chemical substances required for their growth. So, the correct option is B. ( Takes both water and nutrients from host plant )

Lateral roots in dicots are endogenous in origin and they are formed by:-

botany root - external morphology root system in plants modifications of root root modifications

  1. A tissue which give rise to root cap

  2. A tissue which gives rise to cork cambium

  3. A tissue which also works as water checkdam

  4. A tissue which forms the primary vascular bundles

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Correct Option: A

Most of the orchids are

botany root - external morphology root system in plants modifications of root root modifications

  1. Epiphytes

  2. Parasites

  3. Saprophytes

  4. Hygophytes

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Correct Option: A
Explanation:

Most orchids are epiphytes as they have epiphytic roots. Epiphytes are plants that grow anchored to other plants. They are non-parasitic. Epiphytic roots are adventitious roots found in the epiphytes. These roots are present in the air and absorb the moisture and nutrients from the air. Since epiphytic plants do not have roots in the soil, they are called as air plants. Epiphytic roots of orchids grow on the surface of other plants for getting shelter.

Thus, the correct answer is option A.

Identify the correct statement for monocotyledonous root

botany root - external morphology root system in plants modifications of root root modifications

  1. pith is large and well developed

  2. No secondary growth

  3. polyarch condition

  4. All of the above

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Correct Option: A

Soyabean root exports fixed nitrogen as _____ by _____  (respectively).

botany root - external morphology root system in plants modifications of root root modifications

  1. Ureides; Phloem

  2. Ureides; Xylem

  3. Amides; Phloem

  4. Amino adds; Xylem by

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Correct Option: A

Find out the incorrect statements.

botany root - external morphology root system in plants modifications of root root modifications

  1. Secondary and tertiary roots of tap root are borne in acropetal succession

  2. Lateral roots arising from the primary root is exogenous in origin

  3. Primary root is the direct prolongation of radicle

  4. Root hairs are meant for water and mineral absorption

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Correct Option: A

Groundnut, Bean and Alfalfa are members of the group

botany root - external morphology root system in plants modifications of root root modifications

  1. Cruciferae

  2. Leguminosae

  3. Malvaceae

  4. Solanaceae

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Correct Option: B
Explanation:

Groundnut, Bean and Alfalfa, all the three are legumes and thus the members of the family Leguminosae.

The roots that possess haustoria are called

botany root - external morphology root system in plants modifications of root root modifications

  1. Photosynthetic root

  2. Reproductive root

  3. Respiratory root

  4. Parasitic root

Show answer
Correct Option: D
Explanation:

A haustoria is a root-like structure or a structure that grows into or around another structure to absorb water or nutrients. The root of a parasitic plant that penetrates the host's tissue and draws nutrients from it.