Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

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

  1. Ureides; Phloem

  2. Ureides; Xylem

  3. Amides; Phloem

  4. Amino adds; Xylem by
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Soybean and many other legumes fix atmospheric nitrogen into ureides (such as allantoin and allantoic acid) within the root nodules. These fixed nitrogen compounds are then exported to the shoot via the xylem vessels.

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

Find out the incorrect statements.

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

Lateral roots arise endogenously from the pericycle layer within the root, not exogenously. Therefore, the statement claiming lateral roots are exogenous in origin is incorrect, making it the right choice for the question asking for incorrect statements.

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.