Tag: root modifications

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Questions Related to root modifications

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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)

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

Identify the correct pair of plants which produce pneumatophores : 

  1. Heritiera fomes and Dahlia bybrida

  2. Heritiera fomes and Ceriops roxburghiana

  3. Ceriops roxburghiana and Asparagus racemosus

  4. Tinospora cordifolia and Ipomoea batatus
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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 )

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

Most of the orchids are

  1. Epiphytes

  2. Parasites

  3. Saprophytes

  4. Hygophytes
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

The roots that possess haustoria are called

  1. Photosynthetic root

  2. Reproductive root

  3. Respiratory root

  4. Parasitic root
Reveal answer Fill a bubble to check yourself
D Correct answer
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.