Phloem in gymnosperms lacks:

1. Both sieve tubes and companion cells 

2. Albuminous cells and sieve cells

3. Sieve tubes only

4. Companion cells only

Subtopic:  Complex Tissue: Phloem |
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Which of the statements given below is not true about the formation of Annual Rings in trees?
 

1. Annual rings are not prominent in trees of temperate regions.
2. Annual rings are a combination of spring wood and autumn wood produced in a year.
3. Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively.
4. Activity of cambium depends upon variation in climate.
Subtopic:  Types of Wood (OLD NCERT) |
 75%
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Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :

1. Tyloses in vessels

2. Closure of stomata 

3. Flaccidity of bulliform cells

4. Shrinkage of air spaces in spongy mesophyll

Subtopic:  Monocot Leaf |
 81%
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In pteridophytes, phloem is without:

1. bast fibers

2. sieve tubes

3. companion cells

4. sieve cells

Subtopic:  Complex Tissue: Phloem |
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Angular collenchyma occurs in:

1. Salvia

2. Helianthus

3. Althaea

4. Cucurbita

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
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Wound healing is due to:

1. Ventral meristem

2. secondary meristem

3. Primary meristem

4. All of these

Subtopic:  Meristematic Tissue:Classification (OLD NCERT) |
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The interxylary phloem is found in the stem of:  

1. Cucurbita

2. Salvia

3. Calotropis

4. None of these

Subtopic:  Complex Tissue: Phloem |
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The structures present in the roots to absorb water and minerals is:

1. Epidermal extensions

2. Hypodermis

3. Endodermis

4. Epidermal appendages

Subtopic:  Epidermal Tissue System |
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Which of the following is an epidermal cell containing chloroplast?

1. Stomata

2. Hydathode

3. Guard cell

4. None of these

Subtopic:  Epidermal Tissue System |
 73%
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In the sieve elements, which one of the following is the most likely function of P-proteins?

1. Depletion of callose on sieve plates

2. Providing energy for active translocation

3. Autolytic enzymes

4. Sealing off mechanism on wounding

Subtopic:  Complex Tissue: Phloem |
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