[" 16.Gymmospesms are also called so t "],[" cubol spermato hy becouse they "],[" lack "],[" (i)cconbicms "],[" (2) thick walled trackieds "],[" (4) xylem flores."]

Read the following characteristics (I - IV) and identify the structure to which these features correspond I. Cortex is made up of several layers of thin walled parenchyma cells without any intercellular spaces. II Endoderm is made up of a single layer of barrel - shaped cells without any intercellular spaces. III . Few layers of thick - walled parenachymatous cell forms pericycle. IV. Pith is small or inconspicuous. V. Conjunctive tissue present , and 2 to 4 xylem and phloem patches.

Read the following characteristics (I - IV) and identify the structure to which these features correspond I. Cortex is made up of several layers of thin walled parenchyma cells without any intercellular spaces. II Endoderm is made up of a single layer of barrel - shaped cells without any intercellular spaces. III . Few layers of thick - walled parenachymatous cell forms pericycle. IV. Pith is small or inconspicuous. V. Conjunctive tissue present , and 2 to 4 xylem and phloem patches.

Which statements are true about heterocyst? (a) Thick cell wall is permeable to oxygen (b) it lacks PS-II, (c) PS-I remains active which generates ATP required to fix nitrogen. (1) All except (a) (2) All except (b) (3) All except (c) (4) All (a), (b) and (c)

The figure shows the cross-section of the outer wall of a house buit in a hill-resort to keep the house insulated from the freezing temperature of outside. The wall consists of teak wood of thickness L_(1) and brick of thickness (L_(2) = 5L_(1)) , sandwitching two layers of an unknown material with identical thermal conductivites and thickness. The thermal conductivity of teak wood is K_(1) and that of brick is (K_(2) = 5K) . Heat conducion through the wall has reached a steady state with the temperature of three surfaces being known. (T_(1) = 25^(@)C, T_(2) = 20^(@)C and T_(5) = - 20^(@)C) . Find the interface temperature T_(4) and T_(3) .

The figure shows the cross-section of the outer wall of a house buit in a hill-resort to keep the house insulated from the freezing temperature of outside. The wall consists of teak wood of thickness L_(1) and brick of thickness (L_(2) = 5L_(1)) , sandwitching two layers of an unknown material with identical thermal conductivites and thickness. The thermal conductivity of teak wood is K_(1) and that of brick is (K_(2) = 5K) . Heat conducion through the wall has reached a steady state with the temperature of three surfaces being known. (T_(1) = 25^(@)C, T_(2) = 20^(@)C and T_(5) = - 20^(@)C) . Find the interface temperature T_(4) and T_(3) .

What is the value of Van't Hoff's factor (i) for K_2SO_4 ?

The figure shows the cross-section of the outer wall of a house buit in a hill-resort to keep the house insulated from the freezing temperature of outside. The wall consists of teak wood of thickness L_(1) and brick of thickness (L_(2) = 5L_(1)) , sandwitching two layers of an unknown material with identical thermal conductivites and thickness. The thermal conductivity of teak wood is K_(1) and that of brick is (K_(2) = 5K_(1)) . Heat conducion through the wall has reached a steady state with the temperature of three surfaces being known. (T_(1) = 25^(@)C, T_(2) = 20^(@)C and T_(5) = - 20^(@)C) . Find the interface temperature T_(4) and T_(3) .

Read the following statements (i) Collenchyma contains lignin in its wall thickenings. (ii) Collenchyma occurs in only aerial parimary parts and s absent from the roots. (iii) Trichomes are multicellular epidermal outgrowths, which also contain some inner tissues. (iv) Xylem fibres often occur in metaxylem while they are absent or rare in protoxylem. which of these are correct? 1. (i), (ii) and (iii) 2. (i), (ii) and (iv) 3. (i) and (iii) 4. (ii) and (iv)

A thick cylindrical shell made of material of thermal conductivity k has inner and outer radii r and R respectively and its length is L. When the curved surface of the cylinder are lagged (i.e., given insulation cover) and one end is maintained at temperature T_(1) and the other end is maintained at T_(2)(lt T_(1)) , the heat current along the length of the cylinder is H. In another experiment the two ends are lagged and the inner wall and outer wall are maintained at T_(1) and T_(2) respectively. Find the radial heat flow in this case.

A train with cross - sectional are S_(t) is moving with speed v_(i) inside a long tunnel cross - sectional area S_(0)(S_(0) - 4S_(l)) . Assme that almost all the air (density rho ) in front of the train back between its sides and the wall of the tunel. Also the air flow with respect to the train is steady and laminar . Take the ambient pressure and that inside the train to be p_(0) . If the pressure in the region between the sides of the train and the tunnel wall is p , then p_(0) - p = (7)/(2N) rhov_(t)^(2) .Then value of N is ________