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Lenticels

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Select true statements :- (a) Lenticels are absent in woody climbers and leaves (b) Lenticles occur in most woody trees (c) The spring wood is lighter in colour and has a lower density (d) The sap wood also called as duramen

Which of the following statements are incorrect? (i). Secondary growth usually occurs in monocotyledons. (ii). Bark refers to all tissues interior to vascular cambium. (iii). Lenticels permit the exchange of gases between the outer atmosphere and the internal tissue of the stem. (iv). Annual rings give an estimate of the age of the tree.

State true(T) or false(F) to the given statements and select the correct option. ( a ) Annual rings are distinct in plants growing in temperate regions. ( b ) Lenticels occur in most woody trees and permit the exchange of gases. ( c ) Due to stelar secondary growth, central cylinder of wood surrounded by secondary phloem is formed. ( d ) The cells of endodermis opposite to protoxylem divide to give rise vascular cambium in dicot roots.

Choose between the two options to answer the question specified in the brackets for the following: An example is illustrated below : Example : Corolla or Calyx (Which is the outer whorl ?) Answer : Calyx (i) Blood in the renal artery or renal vein (Which one has more urea ?) (ii) Perilymph or endolymph (Which one surrounds the organ of Corti ?) (iii) Lenticels or stomata (Which one remains open always?) (iv) Sclerotic layer or choroid layer (Which one forms the Iris?) (v) Blood in the pulmonary artery or pulmonary vein (Which one contains less oxyhaemoglobin?)

Lenticel and its complementary cells are developed through the activity of

Given diagram shows - (a) Lenticel facilitating the air exchange (b) Hydathode showing gaseous vapour exchange (c) Fungus reproducing by spore formation (d) Alga reproducing by spore formation

Match column I withcolun II and select the correct option from the given codes. {:("Column I","Column II"),(A." Bulliform cells",(i)." Regulate opening and closing of stomata"),(B." Guard cells",(ii)." Aerating pores in the bark of plant"),(C." Lenticels",(iii)." Rolling in and out leaves"),(D." Subsidiary cells",(iv)." Accessory cells"):}

Match column I withcolun II and select the correct option from the given codes. {:("Column I","Column II"),(A." Bulliform cells",(i)." Regulate opening and closing of stomata"),(B." Guard cells",(ii)." Aerating pores in the bark of plant"),(C." Lenticels",(iii)." Rolling in and out leaves"),(D." Subsidiary cells",(iv)." Accessory cells"):}

The function of the lenticel is

Main function of lenticel is