Tag: botany

Questions Related to botany

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.

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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

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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.'

Dry scales of onion possess in their cells

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

  1. Raphides

  2. Prismatic crystals

  3. Sphaeraphides

  4. Crystal sand

Show answer
Correct Option: B
Explanation:

A. Calcium oxalate crystals occur in the form of needle-shaped in few plant cells and are called raphides.

  • Eg- Water hyacinth.

B. Calcium oxalate in the form of rod-like or cubicle shaped in few plant cells and are called prismatic crystals.

  • Eg- dry scales of onions.

C. Calcium oxalate crystals occur in the form of star-shape in plant cells and are called sphaeraphides.

  • Eg- phylloclades of Colocasia.

D. Calcium oxalate is deposited in the leaves within the vacuoles during early developmental stages in plants is called crystal sand. Eg- Beet root

So, the correct answer is 'Prismatic crystals'.

Which one of the following plant species is NOT a sand binder in the semi arid region?

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

  1. Salvadora indica

  2. Calotropis procera

  3. Saccharum munja

  4. Saccharum spontaneum

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Correct Option: A

Which one of the following is an example of a plant adapted to highly saline coastal conditions?

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

  1. Sonneratia acida

  2. Anaardium occidentale

  3. Taxus baccata

  4. Gnetum gemon

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Correct Option: A