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Parenchyma, collenchyma, and sclerenchyma are cells of vascular tissue.

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Important Questions on Organisation in Living Things

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Cortex is the region found between:
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Conjunctive tissue is present between i and ii in iii.
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Cortex is the region found between
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The stomatal pore is guarded by two kidney shaped guard cells. Name the epidermal cells surrounding the guard cells. How does a guard cell differ from an epidermal cell? Use a diagram to illustrate your answer.
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I. Usually cortex of stem is formed during the secondary growth of the stem.
II. It is a couple of layer thick.
III. It is made up of thin-walled rectangular cells.
Select the incorrect statements.
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Well-developed pith is found in
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Conjunctive tissue is made up of
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What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.
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From the following options, choose the false one regarding the statements given with respect to the diagram.

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(i) 'L' is the collenchymatous hypodermis that provides mechanical strength and flexibility to young dicot stems.
(ii) 'M' is the innermost layer of the cortex which usually possesses Casparian strips.
(iii) 'N' is the parenchymatous pericycle that synthesizes food.
(iv) 'O' is xylem which is exarch with respect to the positions of protoxylem and metaxylem.

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Identify the plants (from the list i - vi) which possess the given type of guard cells (as shown in the diagram) in their leaves.
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(i) Grass
(ii) Tomato
(iii) Banana
(iv) Brinjal
(v) Soybean
(vi) Lily
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Study carefully the following statements and select the incorrect one(s).
(i) Lateral roots develop from pericycle.
(ii) Endodermis is the innermost layer of cortex.
(iii) Sapwood is the central, dark-coloured, non-conducting part of secondary xylem.
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Assertion: Water and mineral uptake by root hairs from the soil occurs through apoplast until it reaches endodermis.
Reason    : Casparian strips in endodermis are suberized.
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Given figures (P and Q) represent the stomatal apparatus of dicot and monocot leaves respectively. Select the option which correctly labels A, B, and C.

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Monocot root differs from dicot root in
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Read the following statements and select the correct option.
Statement 1 Anatomically, all the tissues present on the inner side of endodermis such as pericycle, vascular bundles and pith constitute the stele.
Statement 2 Eustele is the stele in which vascular bundles are arranged in the form of a ring as present in dicot stems.
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Why a large number of stomata are present at the lower surface of the dicotyledonous leaves in the terrestrial plants?
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Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}