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BIOLOGY Case study (4 Marks)

PART - 1 - Unit II : CH - 6 Anatomy of Flowering Plants · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 3 questions.

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Case study (4 Marks)

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3 questions · self-marked practice — reveal the answer and mark yourself.

Question 14 Marks
Explain the differences between dorsiventral leaf and isobilateral leaf.
Difference between the cortex of mono- cotyledon and dicotyledon stem:
Answer
Differences between dorsiventral leaf and isobilateral leaf:
Dorsiventral LeafIsobilateral Leaf
The number of stomata is more on the abaxial epidermis than the adaxial epidermis.
Mesophyll is differentiated into spongy and palisade parenchyma.Vascular bundles are large and vary in size as per the size of veins.
Bulliform cells are absent.		Almost equal number of stomata is present on the abaxial and adaxial surfaces.
Mesophyll layer is not differentiated into spongy and palisade.Vascular bundles are similar in size, only the bundles near the mid vein are vary.
Bulliform cells are present.
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Question 24 Marks
Write a note on bulliform cells. Write any three differences between exarch and endarch.
Answer
Bulliform Cells: In the leaves of some plants, especially monocotyledons, some upper epidermal cells are swollen. These are called bulliform cells. They store water and swell due to which the leaves open. As soon as these cells release water, the leaves fold and close. Example: Leaves of plants of Gramineae family.
ExarchEndarch
1. This condition is found in the vascular bundles of the root.Found in the stem.
2. In this, protoxylem is situated towards the outside and metaxylem is situated towards the inside.Protoxylem is situated towards the inside and metaxylem is situated towards the outside.
3. The development of cell progresses from outside to insideDevelopment progresses from inside to outside.
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Question 34 Marks
Write any four differences in the cortex of monocotyledon and dicotyledon stem.
Answer
S.No.Monocotyledon stemDicotyledon stem
1.These have the epidermis of sclerenchyma.These have usually parenchyma.
2.The cortex is absent, in its place there is paren- chyma ground tissue.The cortex is present, ground tissue absent.
3.Endodermis, pericycle, medullary rays and pith are absent.Endodermis, pericycle, medullary rays and pith are present.
4.Vascular bundles are scattered throughout the ground tissue.Vascular bundles are arranged in a ring inside the pericycle.
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