Tag: importance and classification of angiosperms

Questions Related to importance and classification of angiosperms

The root pockets are present instead of root caps 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. Utricularia

  2. Eichhornia

  3. Hydrilla

  4. Limnophylla

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Correct Option: B
Explanation:

  • The root cap protects the growing tip of roots from soil and hard rock surface. 
  • As hydrophytes are generally aquatic plants, no such protection is needed for their roots. 
  • As a result of which root cap is absent in hydrophytes.
  • In given options all are aquatic plants but utricularia, hydrilla and Limnophylla are rooted submerged plants there root are present in soil.
  • Eichhornia is free floating aquatic plant and there root arr floating in water so they don't have the need of root cap they have root pockets.
  • Option B is correct here.

Which one lacks both roots and stomata?

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. Mesophytes

  3. Hygrophytes

  4. Halophytes

Show answer
Correct Option: A
Explanation:

Hydrophytes are water loving plants. Stomata are absent in submerged hydrophytic plants. But floating hydrophytes have stomata on upper surface. e.g., lotus. Exchange of gases occurs through general surface in submerged hydrophytes. Emergent hydrophytes possess special air storage parenchyma called aerenchyma. It makes their different parts light, spongy and flexible. It can also help in exchange of gases with the atmosphere through stomata present in emergent regions. Roots of hydrophytes are poorly developed or completely absent in Wolffia. 

Type of plants having adaptations to check transpiration 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. Xerophytes

  2. Lithophytes

  3. Halophytes

  4. Epiphytes

Show answer
Correct Option: A
Explanation:

Xerophytes are the plants of dry habitats, where the environment favours higher rate of transpiration than the rate of absorption. Xerophytes have various adaptations to check water loss and increase water absorption.

Lithophytes are plants that grow in or on rocks.
A halophyte is a plant that grows in waters of high salinity, coming into contact with saline water through its roots or by salt spray, such as in saline semi-deserts, mangrove swamps, marshes and sloughs and seashores. 
An epiphyte is a plant that grows harmlessly upon another plant (such as a tree) and derives its moisture and nutrients from the air, rain, and sometimes from debris accumulating around it.

Thus, the correct answer is option A.

One of the following is not true for hydrophytes.

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

  1. Vessels are usually absent.

  2. Trachieds are absent.

  3. Cuticle is poorly developed.

  4. Air chambers are well developed.

Show answer
Correct Option: B
Explanation:

In hydrophytes, generally xylem is poorly developed. Tracheids are developed but vessels are completely absent. Hydrophytes possess special air storage parenchyma called aerenchyma. Cuticle is poorly developed.

Excessive aerenchyma is characteristic of

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. Xerophytes

  3. Mesophytes

  4. Heliophytes

Show answer
Correct Option: A
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. 

Submerged hydrophytes exchange gases through

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

  1. Stomata

  2. Hydathodes

  3. Lenticels

  4. General surface

Show answer
Correct Option: D
Explanation:

Exchange of gases occurs through general surface in submerged hydrophytes. 

Totally submerged plants are the true water plants or hydrophytes. Because they are truly aquatic they have the greatest number of adaptations to life in water. The epidermal (outermost) layer shows very little, if any, sign of cuticle formation. All the surface cells appear to be able to absorb water, nutrients and dissolved gases directly from the surrounding water. 

Crystal sand found in Atropa cells is made of

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

  1. Calcium oxalate

  2. Calcium carbonate

  3. Silica

  4. Silica and iron

Show answer
Correct Option: A
Explanation:
  • Minerals crystals are found in plant cell walls in the form of calcium oxalate, carbonate or silica.
  • Calcium oxalate occurs in the form of a mass of crystals around a cellulosic core in few plants.
  • Crystal sand is the calcium oxalate deposition in cells in the form of powdery mass and is seen in Atropa.
  • So, the correct answer is 'Calcium oxalate'.

Raphides are formed of

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

  1. Calcium oxalate

  2. Calcium carbonate

  3. Sodium chloride

  4. Sodium carbonate

Show answer
Correct Option: A
Explanation:
  • Minerals crystals are found in plant cell walls in the form of calcium oxalate, carbonate or silica.
  • Calcium oxalate occurs in the form of a mass of crystals around a cellulosic core in few plants.
  • Calcium oxalate crystals occur in the form of needle-shaped in few plant cells and are called raphides.
  • Eg- Water hyacinth.
  • So, the correct answer is 'Calcium oxalate'.

Study of genetic composition of population in relation to habitat is called

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

  1. Genecology

  2. Genetics

  3. Eugenics

  4. Euthenics

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Correct Option: A
Explanation:
a) Genecology is a branch of ecology which studies genetic variation of species compared to their population distribution in a particular environment.
b) Genetics is the branch of zoology which deals with the mechanism of heredity. It deals with transmission of hereditary characters from parents to offspring. 
c) Eugenics is the branch of science which deals with the selection of desired heritable characteristics in order to improve future generations.
d) Euthenics is the science of improving the internal well-being of the human by improving the external factor of their environment. 
So, the correct answer is 'Genecology'.

______ has glandular hair.

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

  1. Calotropis

  2. Tobacco

  3. Lemon

  4. Yucca

Show answer
Correct Option: B
Explanation:

There are various defense mechanism seen in plants. These are thorns, spines, prickles, glandular hair, stinging hair, alkaloids, tannins, raphides, etc. Tobacco has glandular hair for its defense. Glandular hair with sticky substances protect it from outer agencies. Lemon has thorns to protect itself from its enemies. Yucca has pointed spines at the leaf ends to protect itself from enemies.
Calotropis is known as milkweeds because of the latex they produce. Thus, the correct answer is 'Tobacco.'