Tag: life in water

Questions Related to life in water

Petioles are inflated in floating hydrophytes 

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Wolffia

  2. Eichhornia

  3. Salvinia

  4. Ceratophyllum

Show answer
Correct Option: B
Explanation:

The petiole is the stalk that attaches the leaf blade to the stem. Water hyacinth leaves in natural populations vary from being long and thin‐petioled to being short with inflated petioles. water hyacinth is a floating hydrophyte that has an inflated petiole which helps in keeping it on top of the water level thus allowing it not to sink. So the correct answer is ' Eichhornia or water hyacinth. '

A rooted floating leaved hydrophyte is

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Nymphaea

  2. Hydrilla

  3. Ceratophyllum

  4. Eichhornia

Show answer
Correct Option: A
Explanation:
Rooted Hydrophytes with Floating Leaves:
The roots of these type of hydrophytes are fixed in mud, but leaves have long
petioles which keep them floating on the water surface. Except leaves, the restof the plant body remains in water. Some examples are Nelumbo nucifera,
Nymphaea stellate (water lily), Trapa, Marsilea. 
So the correct answer is 'Nymphaea'. 

Which of the following is incorrect?

evs life in water aquatic plant adaptations pollination through water aquatic adaptation

  1. Herbarium houses dried, pressed and preserved plant specimens.

  2. John Ray developed key for the identification of animals.

  3. The category division is used instead of phylum in case of plants which comprises of fewer similar features.

  4. The set of methods used in classification based on evolutionary relationship is called phenetics.

Show answer
Correct Option: D
Explanation:

The statement- the set of methods used in classification based on evolutionary relationship is called phenetics is wrong.

Phenetics is an attempt to classify organisms based an overall similarity usually in morphology or other observable traits regardless of their phylogeny of evolutionary relation.

Plants adapted to grow in shade are

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Psammophytes

  2. Sciophytes

  3. Mesophytes

  4. Xerophytes

Show answer
Correct Option: B
Explanation:

Plants growing in bright light are called as sun plants or heliophytes, while plants growing in partial shade or low light intensity are called as shade plants or sciophytes. 

In sciophytes the stems are soft, slender with large internodes. Leaves are thin and large sized. The have bright green colour. Leaf cells are large. Cuticle is thin. Stomata are in level with surface. Palisade parenchyma is less developed. There is more vegetative growth as compared to flowering and fruiting
So, the correct answer is 'Sciophytes'

A succulent xerophyte is

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Capparis

  2. Calotropis

  3. Agave

  4. None of the above

Show answer
Correct Option: C
Explanation:

In succulent xerophyte, plants have fleshy organs, where water and mucilage are stored. Depending upon the organ, where succulence occurs, the succulents show chylocauly, i.e., fleshy stem, e.g., Opuntia, Euphorbia, Asparagus; chylophylly ie fleshy leaves, e.g., Agave, Aloe or chylorhizy, i.e., fleshy roots, e.g., Asparagus.

Mechanical tissue is best developed in

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Hydrophytes

  2. Halophytes

  3. Xerophytes

  4. Mesophytes

Show answer
Correct Option: C
Explanation:

Plants living in dry conditions are called as xerophytes. These plants show many morphological and structural adaptations to survive in dry conditions. In stem the mechanical tissue is well developed and also bark is well developed to retain water

The mechanical tissue is least developed in hydrophytes to avoid resistance to water current
So, the correct answer is 'Xerophytes'

Myrmecophily is an association between higher plant and.

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Bacteria

  2. Fungi

  3. Blue-green algae

  4. Ants

Show answer
Correct Option: D

The vegetation of Rajasthan is

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Arctic

  2. Alpine

  3. Deciduous

  4. Xerophytic

Show answer
Correct Option: D
Explanation:

Xerophytes are plants of dry habitats, where the environment favours higher rate of transpiration than the rate of absorption. 

In India various parts of Rajasthan and Gujarat show xerophytic plants. Jaisalmer district and surrounding areas of Rajasthan are true deserts.

Which one is not a trait of xerophytes?

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Thick cuticle

  2. Sunken stomata

  3. Aerenchyma

  4. Well developed mechanical tissue

Show answer
Correct Option: C
Explanation:

Hydrophytes possess special air storage parenchyma tissue, called as aerenchyma. It makes different parts of hydrophytes, light, spongy and flexible. It makes oxygen produced during photosynthesis, available to roots and other non photosynthetic regions. It can also help in exchange of gases with the atmosphere through stomata present in emerged regions of plants. Xerophytes show structural adaptations to discourage water loss through transpiration and increase water absorption. Such adaptations include thick cuticle, sunken stomata, well developed vascular tissue etc.

The waxy surface of floating leaves of the hydrophytes prevents

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Respiration

  2. Photosynthesis

  3. Transpiration

  4. Clogging of stomata

Show answer
Correct Option: D
Explanation:

Hydrophytes are water loving plants. The hydrophytes with floating leaves have large leaves, stomata and waxy coating on the upper surface. The waxy coating prevent wetting and clogging of stomata.