Tag: morphology of the root

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Questions Related to morphology of the root

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

Aerial absorptive roots occur in

  1. Epiphytes

  2. Mesophytes

  3. Hydrophytes

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

The adventitious roots found in the epiphytes are known as the epiphytic root. These roots hang freely in the air and absorb the moisture from the air by a special type of tissue called as velamen. Epiphytic plants are sometimes called as air plants because they do not have roots in the soil. For example, Vanda.

Hence, the correct option is A.

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

Root pocket occurs in

  1. Maize

  2. Pandanus

  3. Banyan

  4. Water hyacinth
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Root pockets are basically root caps but have lost there utility due to non-use. This is because the roots of the plants that hang freely in water have no friction or resistance from the soil particles to overcome. So, root pockets are vestigial (non-functional) root caps. Once removed, there are not regenerated. Found only in floating aquatic plants like Pistia, water hyacinth and Trapa
So, the correct answer is 'Water hyacinth'
Multiple choice botany root - external morphology morphology of the root root system in plants root

Passage cells are found in

  1. Dicot stem

  2. Aerial root

  3. Monocot root

  4. Monocot stem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Passage cells are endodermal cells of older monocot roots, which have retained thin walls and casparian strips. They are not suberized and waterproof. They allow symplastic flow of solutes, such as calcium and magnesium into the stele.

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

A root hair is formed by

  1. Epidermal cell

  2. Endodermal cell

  3. Cortical cell

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Root hairs are tubular extensions of the epidermis that greatly increase the surface area of the root. They are found only in the region of maturation of the root. 
The function of root hairs is to collect water and mineral nutrients present in the soil and take this solution up through the roots to the rest of the plant.
Multiple choice botany root - external morphology morphology of the root root system in plants root

Cuticle is absent in ____________.

  1. Mesophytes

  2. Young roots

  3. Mature stems

  4. Leaves
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The thick waxy layer covers the surface of aerial organs is termed as Cuticle. It is composed of a waxy substance called cutin. It is thin in mesophytes and extremely thick in xerophytes. The cuticle is absent in hydrophytes and underground organs and young roots. Other three options the bearing Cuticle.

So, the correct option is 'Young roots'.

The correct option is B.

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

Quiescent centre is found in

  1. Stem tip

  2. Root tip

  3. Leaf tip

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A quiescent centre is a small group of cells with low mitotic activity (no cell division). Quiescent centre is to be found at the tips of growing roots, in the root meristem and are surrounded by groups of dividing cells.
So, the correct answer is 'Root tip'.

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

The root cap is not used in absorption of water due to

  1. Presence of root hairs

  2. Absence of root hairs

  3. Its presence in elongation zone

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The external protective layer in dicot root is called as epiblema or piliferous layer. The cells of epidermis extend into unicellular root hairs. In the root cap there is no root hair present. In absence of root hairs water absorption is not possible. So, the correct answer is option B.

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

The layer of cells outside the phloem meant for giving rise to the root branches is called as

  1. Cambium

  2. Carpus

  3. Endodermis

  4. Pericycle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The vascular cylinder is interior to the endodermis and is surrounded by the pericycle, a layer of cells that gives rise to branch roots. 
Pericycle is the region consisting of one or more layers of cells, found external to central cylinder (stele). Pericycle is composed of parenchyma cells or sclerenchyma cells or both. Lateral branches and phellogen arise from pericycle.