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Q. No.The companion cells are specialised parenchymatous cells which are closely associated with the sieve tubes elements. The sieve tube elements and companion cells are connected through
1.
Perforations in their common walls
2.
Perforations in their end walls
3.
Pit fields between their common longitudinal walls
4.
Bordered pits in their oblique end plates
Subtopic: Complex Tissue: Phloem |
71%
Level 2: 60%+
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Identify the anatomical structure found in flowering plants on the basis of following features and select the correct option regarding this
1. Produces secondary tissues
2. Gradually obliterated due to secondary growth
3. Performs photosynthesis
4. Conducts water and minerals only
| (i) | First formed primary complex tissue |
| (ii) | Has living elements |
| (iii) | Narrow sieve tubes |
1. Produces secondary tissues
2. Gradually obliterated due to secondary growth
3. Performs photosynthesis
4. Conducts water and minerals only
Subtopic: Complex Tissue: Phloem |
Level 3: 35%-60%
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Dicot leaves are different from monocot leaves as in the former
| 1. | Guard cells are dumb-cell shaped |
| 2. | More stomata are present at abaxial surface as compared to adaxial surface |
| 3. | Trichomes are usually unicellular |
| 4. | Guard cells possess chloroplasts |
Subtopic: Dicot Leaf | Monocot Leaf |
77%
Level 2: 60%+
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Vascular bundles in wheat stems are
| 1. | Scattered and open |
| 2. | Conjoint and open |
| 3. | Radial and closed |
| 4. | Conjoint and closed |
Subtopic: Vascular Tissue System |
71%
Level 2: 60%+
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Read the features related to the anatomical structure of a plant exhibit double fertilization
That structure is
| (i) | It comprises a single layer |
| (ii) | It has barrel-shaped cells with no intercellar spaces |
| (iii) | It has Casparian strips |
| 1. | Epidermis of monocot leaf |
| 2. | Pericycle of dicot root |
| 3. | Endodermis of monocot root |
| 4. | Endodermis of Pinus root |
Subtopic: Anatomy of Root | Dicot Stem |
54%
Level 3: 35%-60%
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In all of the following cases monocot root is similar to dicot root, except
| 1. | Pericycle gives rise to lateral roots |
| 2. | Parenchymatous cells lie between the xylem and the phloem |
| 3. | Usually more than six (polyarch) xylem bundles |
| 4. | Exarch xylem |
Subtopic: Anatomy of Root |
84%
Level 1: 80%+
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Water-impermeable layer in dicot roots is
| 1. | Sclerenchymatous in nature |
| 2. | Innermost layer of cortex |
| 3. | Occupy the central portion |
| 4. | Present just below pericycle |
Subtopic: Anatomy of Root |
70%
Level 2: 60%+
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The transverse section of a plant shows following anatomical features
Identify the category of plants and its parts
| a. | Sclerenchymatous hypodermis |
| b. | Scattered vascular bundles with peripheral smaller than centrally located ones |
| c. | Water-containing cavities present within the vascular bundles |
Identify the category of plants and its parts
| 1. | Monocotyledonous stem |
| 2. | Dicotyledonous root |
| 3. | Monocotyledonous root |
| 4. | Dicotyledonous stem |
Subtopic: Dicot Stem |
80%
Level 1: 80%+
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The extrastelar cambium in dicot stem forms all of the following cells, except
| 1. | Epidermal cells |
| 2. | Cork cells |
| 3. | Cortical cells |
| 4. | Complementary cells |
Subtopic: Anatomy of Root |
53%
Level 3: 35%-60%
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Select correct statements with respect to bulliform cells
| a. | Modified abaxial epidermal cells |
| b. | Large, empty, colourless cells |
| c. | Photosynthetic contain chloroplast |
| d. | Make the leaves curl inwards during water stress conditions |
| e. | Help to minimise water loss |
| 1. | Only a, b and c |
| 2. | Only a, c and e |
| 3. | Only b , d and e |
| 4. | All a, b, c, d and e |
Subtopic: Dicot Leaf | Monocot Leaf |
78%
Level 2: 60%+
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