Tag: the root system

Questions Related to the root system

Among the following, which plant is completely devoid of roots?

evs identifying the plants absorption of water from the soil root system the root system

  1. Ceratophyllum

  2. Hydrilla

  3. Vallisneria

  4. Azolla

Show answer
Correct Option: A
Explanation:
Ceratophyllum is the aquatic angiosperm and may be branched with a single branch per node. Lacks roots, but some time leaves are modified as rhizoids to anchor the plant.
So the correct option is 'Certophyllum'

Find the odd one from the following.

evs identifying the plants absorption of water from the soil root system the root system

  1. Tamarind

  2. Peas

  3. Greengram

  4. Maize

Show answer
Correct Option: D
Explanation:
On the basis of various morphological characters like the number of cotyledons, roots system, and type of venation angiosperms divide into two categories 
Dicots that posses two cotyledons and are characterized by a taproot system with reticulate venation while monocots have one cotyledon with the fibrous root system and normally contain parallel venation.
On the basis of above information tamarind, peas and green gram are dicots while maize is a single monocot.
So the correct option is 'Maize'

Which among the following is a rootless plant?

evs identifying the plants absorption of water from the soil root system the root system

  1. Nymphaea

  2. Sagittaria

  3. Ceratophyllum

  4. Vallisneria

Show answer
Correct Option: C
Explanation:

Nymphaea, Sagittaria, Ceratophyllum and Vallesneria are hydrophytes, which grow in water. Nymphea, Sagittaria and Vallisnaria are rooted hydrophytes, while Ceratophyllum is a submerged floating hydrophyte. 

It remains completely under water but is not rooted in mud. Ceratophyllum is a cosmopolitan genus of flowering plants, commonly found in ponds, marshes, and quiet streams in tropical and in temperate regions. 

Quiescent centre is found in plants at

evs identifying the plants absorption of water from the soil root system the root system

  1. Root tip

  2. Cambium

  3. Shoot tip

  4. Leaf tip

Show answer
Correct Option: A
Explanation:

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

There is maximum growth in root

evs identifying the plants absorption of water from the soil root system the root system

  1. In the dark

  2. In the light

  3. At the root apex

  4. Just behind the root apex

Show answer
Correct Option: D
Explanation:

The region of fastest growth is behind the root tip because it consists meristematic cell that has the ability to divide. It is 4-8 mm long portion behind the tip. This region is called as root elongation region.

Which of the following plant parts can respire even in the absence of oxygen?

evs identifying the plants absorption of water from the soil root system the root system

  1. Seeds

  2. Roots

  3. Stems

  4. Leaves

Show answer
Correct Option: B
Explanation:

When oxygen levels fall too low, the root cells respire anaerobically, producing ethanol (seedling only). Some marshy roots also respire anaerobically.

Thus, the correct answer is option B.

DNA content of quiescent zone is

evs identifying the plants absorption of water from the soil root system the root system

  1. High

  2. Low

  3. Very high

  4. Balanced

Show answer
Correct Option: B
Explanation:

The quiescent center is a small group of cells with low mitotic activity (no cell division). Quiescent center are to be found at the tips of growing roots, in the root meristem and are surrounded by groups of dividing cells.
Thus, the correct answer is option B.

In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order.

evs identifying the plants absorption of water from the soil root system the root system

  1. Cell division, cell enlargement, cell maturation, root cap

  2. Cell division, cell maturation, cell enlargement, root cap

  3. Root cap, cell division, cell enlargement, cell maturation

  4. Root cap, cell division, cell maturation, cell enlargement

Show answer
Correct Option: C
Explanation:

The four zones from the root tip are root cap, cell division, cell enlargement, cell maturation. Each zone has primary meristematic tissues with different functions. Root cap has parenchyma at tip. Zone of cell division has apical meristem, where the cells divide every 12-36 hours. Zone of elongation or enlargement, where cells get longer. Zone of maturation, which become specific cell types like epidermal cells and cortex.

So, the correct answer is 'Root cap, cell division, cell enlargement, cell maturation'

In Monotropa, the special type of root which absorbs nourishment is the 

evs identifying the plants absorption of water from the soil root system the root system

  1. Haustoria

  2. Mycorrhizal root

  3. Clinging root

  4. Adventitious root

Show answer
Correct Option: B
Explanation:

  1. Haustoria is the specialized structure present in parasitic  plant or fungus that absorbs water and nutrients. For example, Cuscuta.
  2. Mycorrhizal roots are formed by the symbiotic association of plant roots and fungus and helps in nutrient absorption. For example, Monotropa.
  3. Clinging roots are many short branch like adventitious roots arise from nodes. For example, Piper betel.
  4. Adventitious roots are the roots that develop from any part of plant other than radicle. For example, banyan tree
So the correct option is 'Mycorrhizal root'.

Which is the plant with edible root?

evs identifying the plants absorption of water from the soil root system the root system

  1. Carrot

  2. Tapioca

  3. Turnip

  4. All of the above

Show answer
Correct Option: D
Explanation:

In some plants, root get modified for storage and are of mainly four types:-

A)Conical roots -Roots get swollen at the base and tapers gradually the apex giving a shape of the cone.
Ex- carrot.
B)Fusiform roots -Swollen at middle and narrow toward its both ends.
Ex- radish.
C)Napiform roots-Globular or spherical shape. the basal portion is much swollen which suddenly tapers towards the apex giving the apex a top shaped appearance.
Ex- turnip and beet.
D)Tuberous roots -These are adventitious roots swollen without any definite shape.
Ex- sweet potato and tapioca.
So the correct option is 'All of the above'