Tag: botany

Questions Related to botany

The process in which loss of water occurs in the form of water vapour is

botany breath and blood of life stomata and transpiration transport in organisms long distance transport of water different types of circulatory systems

  1. Respiration

  2. Guttation

  3. Transpiration

  4. Exosmosis

Show answer
Correct Option: C
Explanation:
Respiration  is a process in which living organisms produces energy, with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
Guttation is the loss of water in the form of water droplets from hydathodes (small pores) on the leaf margin of a plant.
Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.
The passage of material through a semi-permeable membrane from a region of higher to a region of lower concentration, especially the passage of water through a cell membrane into the surrounding medium, is called exosmosis. 
Thus, the correct answer is option (C). 

A leafy twig of mesophytic plant dipped in water would demonstrate 

botany breath and blood of life stomata and transpiration transport in organisms long distance transport of water different types of circulatory systems

  1. Photosynthesis

  2. Transpiration

  3. Respiration

  4. Gutttation

Show answer
Correct Option: B
Explanation:
Mesophytic plants are the plants which grow in the areas/lands which is not too dry not too wet.
When this type of plant is dipped in water (making hydrophytic) then it will demonstrate transpiration More will be the amount of water and more will be the transpiration rate.
Biochemical processes like photosynthesis, respiration and guttation do not depend upon the nature of land but transpiration depends upon the amount of water present in the soil.
So, the correct answer is 'Transpiration'.

The number of xylem bundles in monocot roots are:

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

  1. 1

  2. 2

  3. 4

  4. 8

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Correct Option: A

Monocotyledonous root differs from dicot root in which of the following internal features (a to d)?


a. Presence of parenchymatous pericycle
b. Absence of fewer xylem bundles
c. Presence of large and well-developed pith
d. Presence of parenchymatous cortex without intercellular spaces

Find out the correct option.

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

  1. a, c, & d

  2. b & d

  3. b & c

  4. a & d

Show answer
Correct Option: A

Read the  following statements and choose the correct option. 
a) Pith is large and well developed in roots of monocot plants.
b) Bundle sheath is  presents in dicot stem.
c) Water containing cavities are present within vascular bundles of monocot stem.

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

  1. Only (b) is incorrect

  2. Only (a) is incorrect

  3. Only (a) and (b) are correct

  4. All (a), (b) and (c) are correct

Show answer
Correct Option: A
Explanation:

 In dicot stem, bundle sheath is absent, while in monocot stem the bundle sheath is present as it surrounds the scattered vascular bundles. So the correct option is 'Only (b) is incorrect'.

A typical monocotyledonous root is characterized by 

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

  1. Usually more than six xylem bundles

  2. Large and well developed pith

  3. No secondary growth

  4. All of the above

Show answer
Correct Option: D
Explanation:
A typical monocotyledonous root can be characterized by :-
1) The xylem shows a polyarch condition where it forms numerous groups or bundles (usually 12 to 21).
2) The cambium is absent in all the stages and there is no secondary thickening in such roots.
3) The pith is large and well developed.
So, the correct answer is 'All of the above'.

Bundle sheath cells are similar to mesophyll cells in 
a. Having grana.
b. Having large number of chloroplasts
c. Being involved in $CO _2$ fixation
d. Being impervious to gaseous exchange
e. Their primary $CO _2$ fixation product.

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

  1. Only c& e

  2. Only c

  3. Only a,b& e

  4. Only a & d

Show answer
Correct Option: A

The character of monocot is

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

  1. Net-veined leaves

  2. Annual rings

  3. Seed with two masses of stored food

  4. Conducting strands scattered in ground tissue

Show answer
Correct Option: D
Explanation:

Net-veined leaves, annual rings and seed with two masses of stored food are characteristic features of dicots. 

In a monocotyledenos, the vascular bundles are not arranged in a circle but are usually scattered throughout the ground tissue. There is no clearly defined pith as there is in many dicotyledonous species. The vascular bundles of monocotylenous plants do not contain a layer of meristematic tissue (cambium) as the dicots do. Thus, no new cells can be formed inside the vascular bundles of monocots and their vascular bundles are termed as closed, whereas those of dicot plants are open. 

In monocots, root cap is formed by

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

  1. Dermatogen

  2. Calyptrogen

  3. Wound cambium

  4. Vascular cambium

Show answer
Correct Option: B
Explanation:

Dermatogen is the histogen or meristematic regions of root and stem which is produced by apical meristem and give rise to uniseriate epidermis by anticlinal divisions; option A is incorrect. Monocotyledons have one additional histogen along with dermatogens, periblem and plerome Calyptrogen being the fourth one that makes root cap. The vascular cambium, also called as wood cambium, has thin walled highly vacuolated cells of two types, the fusiform initials and the ray initials. The fusiform initials are the elongated cells that give rise to secondary xylem and secondary phloem. Ray initials are horizontally organized and produce vascular rays (medullary rays or ray parenchyma). 

Thus, the correct answer is option B.

Monocot root differs from dicot root in having

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

  1. Open vascular bundle

  2. Scattered vascular bundle

  3. Large pith

  4. No pit

Show answer
Correct Option: C
Explanation:

Pith is the innermost region of the root representing the central axis. It is composed of few loosely arranged parenchyma cells. Large pith is present in monocot roots. In dicot roots, pith is absent. Open vascular bundles are present in dicots. Scattered vascular bundles are present in moncot stem. Radial vascular bundles are present in both monocot and dicot roots.

Thus, the correct answer is option C.