Which one gives the most valid and recent explanation for stomatal movements?

(a) Transpiration

(b) Potassium influx and efflux

(c) Starch hydrolysis

(d) Guard cell photosynthesis

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You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

(a) Secondary xylem
(b) Secondary phloem
(c) Protoxylem
(d) Cortical cells

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Interfascicular cambium develops from the cells of ?
(a) medullary rays
(b) xylem parenchyma
(c) endodermis
(d) pericycle

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Lenticels are involved in

(a) transpiration

(b) gaseous exchange

(c) food transport

(d) photosynthesis

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Age of a tree can be estimated by?

(a) its height and girth
(b) biomass
(c) number of annual rings
(d) diameter of its heartwood

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The common bottle cork is a product of

(1) Dermatogens

(2) phellogen

(3) xylem

(4) vascular cambium

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Companion cells are closely associate4d with

(1) sieve elements

(2) vessel elements

(3) trichomes

(4) guard cells

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Closed vascular bundles lack

(1) ground tissue

(2) conjunctive tissue

(3) cambium

(4) pith

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Water containing cavities in vascular bundles are found in

(a) sunflower

(b) maize

(c) Cycas

(d) Pinus

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Ground tissues includes

(a) All tissues except epidermis and vascular bundles

(b) Epidermis and cortex

(c) All tissues internal to endodermis

(d) All tissues external to endodermis

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