Tag: identifying the plants

Quizzes (5) Questions (106)

Questions Related to identifying the plants

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

Lignification is associated with

  1. Xylem

  2. Phloem

  3. Parenchyma

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

Lignification is associated with xylem. The lignin strengthens the walls of the xylem and the spirals provide flexibility. The advantages of lignification are :

1. Strengthens/thickens the wall
2. Waterproofing
3. Improving adhesion of water molecules
4. Spiral pattern provides flexibility/stretching/movement
5. Prevents collapse of xylem
6. Water under tension/at low pressure/negative pressure
7. Reduces lateral loss of water through wall
8. Increases capillarity
9. Prevents stem breaking

So, the correct option is 'Xylem'.

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

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

  1. Ceratophyllum

  2. Hydrilla

  3. Vallisneria

  4. Azolla
Reveal answer Fill a bubble to check yourself
A Correct answer
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'
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Find the odd one from the following.

  1. Tamarind

  2. Peas

  3. Greengram

  4. Maize
Reveal answer Fill a bubble to check yourself
D Correct answer
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'
Multiple choice evs identifying the plants absorption of water from the soil root system the root system

Which among the following is a rootless plant?

  1. Nymphaea

  2. Sagittaria

  3. Ceratophyllum

  4. Vallisneria
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

There is maximum growth in root

  1. In the dark

  2. In the light

  3. At the root apex

  4. Just behind the root apex
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

DNA content of quiescent zone is

  1. High

  2. Low

  3. Very high

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

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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'

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

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

  1. Haustoria

  2. Mycorrhizal root

  3. Clinging root

  4. Adventitious root
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.