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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Vascular tissues in flowering plants develop from

(1) phellogen

(2) plerome

(3) periblem

(4) dermatogen

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For a critical study of secondary growth in plants, whic one of the following pairs is suitable:

(a) Sugarcane and sunflower

(b) Teak and pine

(c) Deodar and fern

(d) Wheat and maiden hair fern

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A common structural feature of vessel elements and sieve tube elements is :-
(a) thick secondary walls
(b) pores on lateral walls
(c) presence of P-protein
(d) enucleate condition

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