Tag: botany

Questions Related to botany

In dorsiventral leaf, more number of stomata

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Occur on both the layers of epidermis

  2. Occur on lower epidermis

  3. Occur in pits on the upper epidermis

  4. Do not occur on the epidermis

  5. Bryophytes

Show answer
Correct Option: B
Explanation:

In dorsiventral leaf, more number of stomata occur on lower epidermis and less number of stomata present on upper epidermis.

So, the correct option is ‘occur on lower epidermis'.

In a dorsiventral leaf, the location of xylem and phloem is

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Abaxial and adaxial respectively

  2. Adaxial and abaxial respectively

  3. Both are abaxial

  4. Both are adaxial

Show answer
Correct Option: B
Explanation:

in dorsiventral or dicot leaf, midirib or main vein represents the vascular bundles. In this, xylem is present towards upper epidermis and phloem present towards the lower epidermis. These are collateral, conjoint, closed the position of protoxylem and metaxylem is not specified clearly.

So, the correct answer is 'Adaxial and abaxial respectively'.

In dorsiventral leaves stomata occur

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. More on upper palisade containing surface and less on spongy parenchyma containing lower surfac

  2. Fewer on upper surface and more on lower surface

  3. Equally on both

  4. None of the two surfaces

Show answer
Correct Option: B
Explanation:

In dorsiventral leaves, less stomata are present in the upper epidermis and more stomata are present on the lower epidermis.

So, the correct option is ‘Fewer on upper surface and more on lower surface’.

Tetrarch bundles occur in

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Leaf of Cicer arietinum

  2. Leaf of Pisum sativum

  3. Root of Cicer arietinum

  4. Root of Zea mays

Show answer
Correct Option: C
Explanation:

Stele with four vascular bundles is called tetrarch stele. it is generally found in dicotyledons. In the vascular bundles xylem and phloem are on different raidii. So the vascular bundles are called radial vascular bundles. In the xylem protoxylem is faced towards the pericycle and metaxylem is faced towards the medulla.  eg:Cicer arietinum  roots. 

So, the correct option is 'Roots of Cicer arietinum.

The ecosystem services include.

botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

  1. Maintenance of biodiversity

  2. Pollination of crop

  3. Spiritual, cultural and aesthetic values

  4. All of these

Show answer
Correct Option: D
Explanation:

  • The ecosystem services include 
  • provisioning services such as food and water;
  • regulating services such as regulation of floods, drought, land degradation, and disease; 
  • supporting services such as soil formation and nutrient cycling;
  • and cultural services such as recreational, spiritual, religious and other non-material benefits.
So, the correct option is 'All of these'

Who confirmed communities with more species tend to be more stable than those with less species?

botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

  1. Alexander von Humboldt

  2. David Tilman

  3. Paul Ehrlich

  4. Edward Wilson

Show answer
Correct Option: B
Explanation:

Ecologists believe that the communities with more species tend to be more stable than those with less species.

Keystone species deserve protection because these 

botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

  1. are capable of surviving in harsh environmental conditions

  2. indicate presence of certain minerals in the soil

  3. have become rare due to overexploitation

  4. play an important role in supporting other species.

Show answer
Correct Option: D
Explanation:

Keystone species are those species which have significant and disproportionately large influence on the community structure and characteristic. It has often considered low abundance and biomass as compared to dominant species.

When two similar species live in the same area, they may evolve to become more different in order to ________________.

botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

  1. drive the other species to extinction

  2. reduce competition

  3. use up the other species resources

  4. reduce genetic variation

Show answer
Correct Option: B
Explanation:

According to the mechanism of resource partitioning (supported by Mac Arthur), if two species compete for the same resource, they could avoid competition by choosing, for instance, different times for feeding or different foraging patterns. Two species evolve to become different too reduce competition, so that species can co-exist. 

What are the important factors that bring about biological diversity?

botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

  1. Temperature

  2. Enviornment

  3. Climatic conditions

  4. All of the above

Show answer
Correct Option: D
Explanation:

The correct answer is 'all of the above'

Biological diversity occurs due to the differential adaptation of organisms to varying environmental factors such as differences in temperature and climate conditions. These various mechanisms applied for adapting create the vast biological diversity we see around the world. 
So the correct option is D.

Decomposers converts

botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

  1. Organic material into inorganic material

  2. Organic matter into carbon dioxide and nutrients

  3. Kill the soil microbes

  4. All

Show answer
Correct Option: B
Explanation:

Detritus is defined as dead and decaying organic matter that includes fallen leaves, dead plant parts and animals. It is the primary source of energy in the detritus food chain in which the microbes such as protozoans, bacteria and fungi help in the breaking down of the complex organic matter. They are called decomposers. Detritus food chain hence helps in soil replenishment by adding nutrients to the soil. They convert organic matter into carbon dioxide and nutrients. Thus the correct answer is option B.