The given special structure is seen mainly in:

 

1. Grasses
2. Aquatic plants
3. Xerophytic plants
4. Mangroves

Subtopic:  Vascular Tissue System |

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What would be true for both companion cells and albuminous cells?
I. They are derived from same mother cell as their associated cells.
II. Both contain a nucleus.
III. Both die when their associated cells die.

1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III

Subtopic:  Complex Tissue: Phloem |

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The given diagram shows the central core of root in a certain plant. P is phloem and protoxylem elements and V is metaxylem. What is correct for structures indicated by arrows?

1. They show aerenchyma essential for aeration of root cells
2. They show cells in the roots that contain chloroplast
3. They show cells lack the characteristic radial and inner tangential wall thickening which is common to endodermal cells
4. They show cells that store resins and oils in the roots

Subtopic:  Complex Tissue: Xylem | Complex Tissue: Phloem |
 63%

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In the transverse section of a monocot root given below, identify A, B, C and D:

 

A B C D
1. Epidermis Exodermis Endodermis Pericycle
2. Exodermis Epidermis Endodermis Pericycle
3. Epidermis Exodermis Pericyle Endodermis
4. Exodermis Epidermis Pericyle Endodermis
Subtopic:  Anatomy of Root |
 63%
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Identify the correct statement regarding A and B [types of concentric vascular bundles] in the given diagram:

1. A is Amphivasal and found in Dracaena while B is amphicribal and found in Selaginella
2. A is Amphivasal and found in Selaginella while B is amphicribal and found in Dracaena
3. A is Amphicribal and found in Dracaena while B is amphivasal and found in Selaginella
4. A is Amphicribal and found in Selaginella while B is amphivasal and found in Dracaena

Subtopic:  Vascular Tissue System |

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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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