A. When bulliform cells are flaccid, they make the leaves curl inwards to minimize water loss. B. In dicot leaves, the size of the vascular bundles is dependent on the size of the veins. C. The adaxial epidermis bears more stomata than the abaxial epidermis in dicot leaves. A b c (1) t f t (2) f f t (3) t t f (4) f t t
Answers
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many monocots.These cells are present on the adaxial or the upper surface of the leaf. They are generally present near the mid vein. These cells are large,empty and colourless.
The mechanism of working of bulliform cells can be explained as:
When the water supply is sufficient to the plant, the bulliform cells absorb water and due to the absorption of water, they become turgid . When they are turgid, the leaf straightens up and it is exposed . The leaf straightening permits the loss of the water . Whereas on the other hand, at the time of insufficient water supply, these cells lose water and become flaccid due to the loss of water . When they are flaccid during the water stress, they make the leaf curled inwards so that leaf is exposed less .The curling minimises water loss . Hence, the bulliform cells minimise the water loss during the unfavourable or stress conditions.
(source - Bulliform cells)
Transverse section of grass leaf (Poa praetense). During drought, many grass leaves close as the two sides of the blade fold up toward each other. Once adequate water is available, the leaves open again. When folded, the leaves are less exposed to sunlight, so they are heated less. This movement is due to water being absorbed or lost by very large epidermal cells, called bulliform cells. The bulliform cells (arrows) are located near the midrib. This species only has the two sets of bulliform cells, each set running the length of the midrib. In other species of grasses, there may be many sets of bulliform cells, allowing the leaf blade to curl or roll up rather than merely fold.
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Nadi M Dixit
Nadi M Dixit, Master's Biology & Mathematics, Indian Institute of Science Education and Research, Thiruvananthapuram (2019)
Answered Dec 24, 2016 · Author has 77 answers and 86.4k answer views
Bulliform cells are large colorless cells that are present close to the mid-vein in the upper surface of many monocot leaves. Bulliform cells play an important role in maintaining the structure of the leaf depending upon the availability of water.
When there is sufficient water available to the plant, the bulliform cells take in a lot of water and hence become turgid, enabling the leaf to stiffen up. This exposes the leaf to the sun and promotes transpiration. When the plant faces a scarcity of water, then the bulliform cells, due to the lack of water become flaccid and the leaf wilts, hence minimizing transpiration.
Source: Moore, R. et al. (1998) Botany. 2nd Ed. WCB/McGraw Hill. ISBN 0-697-28623-1
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Deepshi Sharma
Deepshi Sharma, Mbbs from Subharti University
Answered Dec 25, 2016
Bulliform cells are
Empty
Colourless
Large size
They are present in monocot leaves on the adaxial ( upper/ dorsal) surface.
Helps in curling of leaves to prevent water loss.
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Hey Dear,
◆ Answer -
(3) TTF
● Explanation -
(A) When bulliform cells are flaccid, they make the leaves curl inwards to minimize water loss.
- True
(B) In dicot leaves, the size of the vascular bundles is dependent on the size of the veins.
- True
(C) The adaxial epidermis bears more stomata than the abaxial epidermis in dicot leaves.
- False
Corrected statement :- the adaxial epidermis bears less stomata than the abaxial epidermis in dicot leaves.
Hope this was helpful..