Tag: arrangement of leaves

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Questions Related to arrangement of leaves

Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

Read the following matches.

(i) Guava Spiral phyllotaxy
(ii) Ruscus Cladode
(iii) Opuntia Phylloclade's
(iv) Mustard Spiral phyllotaxy


Which of these are correct?

  1. (i), (ii) and (iii)

  2. (ii), (iii) and (iv)

  3. (i), (iii) and (iv)

  4. (i), (ii) and (iv)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

1) Guava- Opposite phyllotaxy

2) Ruscus- Cladode
3) Opuntia- Phylloclade
4) Mustard- Alternate/spiral phyllotaxy


So the correct option is " B) ii, iii, iv". 

Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

Reticulate venation is not seen in _________.

  1. Mango

  2. Maize

  3. Sunflower

  4. Hibiscus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In reticulate venation, the veins branch and unite forming a complicated network. All the veins are interconnected, like the strands of the net.
Leaves of dicot plants generally have reticulate venation. Maize is a monocot and hence shows only parallel venation.
So, the correct option is 'Maize'.
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

Veins are _________ strands on the lamina.

  1. Conducting

  2. Transpirational

  3. Exceptional

  4. Flattened
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Veins provide support for the leaf and transport both water and minerals (via xylem) and food energy (via phloem) through the leaf and on to the rest of the plant and hence are conducting in their function.

So, the correct option is 'Conducting'.

Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

Parallel venation is a characteristic feature of ..........

  1. Monocotyledon

  2. Dicotyledon

  3. Pteridophytes

  4. Bryophytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation


Parallel venation, in which veins run parallel to one another from base to the tips of the leaf. Reticulate venation in which veins are arranged in a net like a pattern on both sides.

Name of the organism  Type of venation
Monocotyledons Parallel
Dicotyledons Reticulate
Pteridophytes Reticulate 
Bryophytes The plant body is not differentiated into root, stem, leaves, lack vascular tissue( Xylem and phloem) and there are no veins i.e. .conducting lines, so venation is not present.

So, the correct option is ' Monocotyledonae '

Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

Leave grow due to presence of 

  1. Apical meristan

  2. Diffused meristem

  3. Intercalary meristem

  4. Mass meristem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The apical meristem, also known as the “growing tip,” is an undifferentiated meristematic tissue found in the buds and growing tips of roots in plants.
So the correct option is 'Apical meristem'.
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

If a leaf has more than one prominent vein it is said to be

  1. Unicostate

  2. Multicostate

  3. Pinnate

  4. Palmate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Venation in which the lamina has more than one equally prominent or principal veins is Multicostate reticulate venation
  • They give rise to lateral veins connected by reticulations of veinlets. 
  • Multicostate reticulate venation has two forms. Convergent and Divergent.
  • Hence, If a leaf has more than one prominent vein, it is  Multicostate.
  • So, the correct answer is 'Multicostate'.
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

The monocotyledons showing reticulate venation is

  1. Smilax

  2. Dioscorea

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Reticulate venation is found in dicot leaves, while in monocot. Reticulate venation is found in dicot leaves, while in monocot leaves venation is of parallel type.
  •  Monocot having reticulate venation, e.g., Smilax, Colocasia, Dioscorea.
  • Hence, The monocotyledons showing reticulate venation is Smilax and Dioscorea.
  • So, the correct answer is 'Both A and B
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

The monocotyledonous leaf shows which of the following venation?

  1. Pinnate reticulate

  2. Parallel

  3. Palmate reticulate

  4. Pinnate parallel
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Parallel venation refers to a pattern in the veins of a leaf where the secondary veins run parallel to each other off of a central, perpendicular primary vein. 
  • The best example for parallel venation is banana. Some of the monocotyledons like bajra, sorghum, maize, wheat, rice, grasses, coconut, palm and then dicots like mango also the examples of parallel venation.
  • Hence, The monocotyledonous leaf shows Parallel venation.
  • So, the correct answer is 'Parallel'.
Multiple choice botany leaf - external morphology venation arrangement of leaves morphology of leaf

Reticulate venation is observed mostly in

  1. Monocot plants

  2. Dicot plants

  3. Thallophytes

  4. Bryophytes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Venation is the arrangement of veins in a leaf. In reticulated venation, veins are interconnected and form a web-like network. There is a prominent vein called the midrib from which many small veins arise which finally form a net-like structure in the lamina. This kind of venation is seen in dicots. for example, mango.