Tag: adaptive features

Questions Related to adaptive features

Phreatophytes are xerophytes with roots

  1. Spread along the soil surface

  2. Well spread in the soil

  3. Very deep reaching ground water fringe

  4. Very deep but well above ground water


Correct Option: C
Explanation:

A phreatophyte is a deep-rooted plant that obtains a significant portion of the water that it needs from the phreatic zone (zone of saturation) or the capillary fringe above the phreatic zone. Phreatophytes are plants that are supplied with surface water and often have their roots constantly in touch with moisture. These plants have very deep roots that are able to reach the water table. So the correct answer is ' Very deep reaching ground water fringe'. 

In xerophytic leaf, the stomata are situated 

  1. On both surface

  2. On upper surface

  3. On lower surface

  4. Absend from both surfaces


Correct Option: C
Explanation:

The xerophytic plants are the plants present in the desert and other dry environments. The rate of transpiration is high in xerophytic plants due to high temperatures. In order to minimize the rate of transpiration, they have sunken stomata.

Thus, the correct answer is option (C),

Lamina is reduced in

  1. Xerophytes

  2. Mesophytes

  3. Hydrophytes

  4. Climbers


Correct Option: A
Explanation:

Lamina is reduced in xerophytic plants. In xerophytes, the petiole is modified into expanded green structure which carries out photosynthesis in case of reduced lamina.  For example, in Australian acacia.

Thus, the correct answer is 'Xerophytes.'

Which one is a exclusive xerophytic adaptation?

  1. Absence of stomata

  2. Long tap root system

  3. Stipular leaves

  4. Spines


Correct Option: B

Which of the following is not a character of xerophytes?

  1. Thick cuticle

  2. Well developed mechanical tissue

  3. Well developed conducting tissues

  4. Spongy parenchyma


Correct Option: D
Explanation:

Xerophytes are the plants that survive in an environment having little supply of water or moisture. To survive with limited water supply they have anatomical modifications such as-

1) The epidermis is covered with thick cuticle to prevent water loss by transpiration.
2) Waxy coating is present on leaves and stem to prevent transpiration losses and stomata are generally confined on the lower surface of the epidermis of leaves.
3) Mechanical and vascular tissues are well developed.
4) The xerophytes have abundant palisade parenchyma and limited spongy parenchyma.
So, the correct answer is 'Spongy parenchyma'.

Deep roots occur in

  1. Perennial nonsucculent xerophytes

  2. Perennial succulent xerophytes

  3. Annual xerophytes

  4. Ephemeral xerophytes


Correct Option: A
Explanation:

In non-succulent Perennial have extensive root systems, roots penetrate deep into the soil and establish contact with sub-soil water. 

  • Some trees have deep, extensive root systems that anchor them to hillsides. Shrubs service berry is a deep-rooted deciduous shrub or small tree that grows best in well-drained, slightly acidic, moist soil. Ground covers, Vetiver Grass.
So, the correct option is 'Perennial non succulent xerophytes'