Identify the option where the difference between the vascular bundles of Dicot and Monocot stem is not correctly mentioned:

 

Dicot stem

Monocot stem

1.

Collateral and open

Collateral and closed

2.

Arranged in a ring

Scattered

3.

Larger toward the center

Of uniform size

4.

Phloem parenchyma present

Phloem parenchyma absent

Subtopic:  Dicot Stem | Monocot Stem |
 82%
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Identify the option where the difference between the anantomy of Dicot and Monocot root is not correctly mentioned:

Dicot root

Monocot root

1.

Xylem bundles

Numerous

Vary between 2 and 6

2.

Pith

Small/absent

Large/well developed

3.

Pericycle

Gives rise to lateral roots, cambium and cork cambium

Gives rise to lateral roots only

4.

Cambium

Appears later as a secondary meristem

Altogether absent

Subtopic:  Anatomy of Root |
 76%
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In the given diagram:

1. the lighter outer area is the heart wood or alburnum and is mechanically strong, resistant to decay, and less easily penetrated by wood-preservative chemicals

2. the lighter outer area is the Sapwood or alburnum and is involved in transport of water and minerals to the crown of the tree

3. the darker inner area is the heart wood or duramen and is involved in transport of water and minerals to the crown of the tree

4. the darker inner area is the sap wood or duramen and is mechanically strong, resistant to decay, and less easily penetrated by wood-preservative chemicals

Subtopic:  Types of Wood (OLD NCERT) |
 81%

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The following diagram shows the anatomy of the root of an epiphytic orchid. The function of the structure marked X is:

  

1. Photosynthesis
2. Storage
3. Protective
4. Repair and healing

Subtopic:  Anatomy of Root |
 60%

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The balloon like structures seen in vessels in the given diagram are called as:

1. Tyloses
2. Hydathodes
3. P proteins
4. Lenticells

Subtopic:  Complex Tissue: Xylem |
 79%

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In the given diagram showing the anatomy of a tree trunk, what are A, B, C and D respectively?

  

1. Secondary xylem, Secondary phloem, Periderm, Bark
2. Secondary phloem, Secondary xylem, Periderm, Bark
3. Secondary xylem, Secondary phloem, Phellem, Periderm
4. Secondary phloem, Secondary xylem, Phellem, Periderm

Subtopic:  Activity of Cork Cambium |
 62%

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In the section of a monocot leaf shown in the given diagram, what would be true for the structures labeled X?

 

1. They regulate the opening and closing of the stomata in the adaxial surface of the leaves
2. Due to presence of lignin in their walls they provide support to the leaf surface in windy conditions
3. They are involved in folding and unfolding of leaf tissue to control light intensity and reduce overall water loss
4. They are abnormal cells produced during healing of the adaxial surface after injury and are common portals of entry of viruses into the plants

Subtopic:  Monocot Leaf |
 57%

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In the given diagram if xylem is represented by 1, the companion cells will be represented by:

  

1. 2
2. 3
3. 4
4. 5

Subtopic:  Complex Tissue: Phloem |

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A nail is driven in the trunk of a young tree, about 4 meters tall, at a height of about 2 meters from the ground. In a few years the tree grows to a height of 20 meters. What would be the height of the nail from the ground now?

1.2 meters2.10 meters
3.12 meters4.18 meters

Subtopic:  Activity of Cork Cambium |
 56%

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What type of vessels are you most likely to see in metaxylem of a stem?

1. 

2. 

3. 

4. 

Subtopic:  Complex Tissue: Xylem |

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