In land plants, the guard cells differ from other epidermal cells in having:-

(a) mitochondria
(b) endoplasmic reticulum
(c) chloroplasts
(d) cytoskeleton

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The cork cambium, cork and secondary cortex are collectively called

(a) phellogen (b) periderm

(c) phellem   (d) phelloderm

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The chief water conducting elements of xylem in gymnosperms are

(a) vessels

(b) fibres

(c) transfusion tissue

(d) tracheids

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Which one of the following is not a lateral meristem?

(a) Cork cambium

(b) Interfascicular cambium

(c) Phellogen

(d) Intercalary meristem

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Heartwood differs from sapwood in 

(a) presence of rays and fibres

(b) absence of vessels and parenchyma

(c) having dead and non-conducting elements

(d) being susceptible to pests and pathogens

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The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

(a) maturing (b) elongating

(c) widening (d) differentiating

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In barley stem, vascular bundles are

(1) open and scattered

(2) closed and scattered

(3) open and in a ring

(4) closed and radial

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Guard cells help in ?
(a) protection against grazing
(b) transpiration
(c) guttation
(d) fighting against infection

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Palisade parenchyma is absent in leaves of :-

(a) Sorghum
(b) mustard
(c) soybean
(d) gram

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Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of

(a) xerophytes
(b) mesophytes
(c) epiphytes
(d) hydrophytes

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