Least distinct annual rings are present in regions like

(A)tropical areas

(B)desert

(C)coastal areas

(D)All of the above

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Secondary growth in extra stelar region is due to

(A)Phellogen

(B)Cork cambium

(C)Extrastelar cambium

(D)All of these

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Cork cambium is derived from the

(A)hypodermis

(B)outer layer of the cortex

(C)endodermis

(D)Both A and B

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Cork cambium gives rise

(A)cork

(B)phelloderm

(C)phellem

(D)All of the above

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Periderm comprises of

(A)Phellem

(B)phellogen

(C)phelloderm

(D)All of these

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The dead cells which are formed towards the epidermis by cork cambium are called as

(A)cork

(B)phellem

(C)phelloderm

(D)Both A and B

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The chloroplast containing parenchymatous cells which are formed towards the innersideby cork cambium are called as

(A)secondary cortex

(B)phelloderm

(C)phellem

(D)Both A and B

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Which one is true for phellogen

(A)thick layer cells

(B)narrow, thin walled and nearly rectangular cells

(C)gives rise to phellem and phelloderm

(D)All of the above

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Incorrect match is

(A)Phellogen  = cork cambium

(B)Phellem = Cork

(C)Phelloderm=cortex

(D)Phelloderm=Secondary cortex

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In plants the replacement of the outer cortical and epidermal layers when they are broken are because of the

(A)Cork cambium

(B)vascular cambium

(C)Phellogen

(D)Both A and C

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