What are the similarities and difference among the 3 life spans of vascular seeded plants?

What are the similarities and difference among the 3 life spans of vascular seeded plants?
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If l1 and l2 are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w1 and w2acting on strips parallel to l2 and l1 is (A) w1/w2 = l2/l1 (B) w1/w2 = (l2/l1)² (C) w1/w2 = (l2/l1)3 (D) w1/w2 = (l2/l1)

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Long and short spans of a two way slab are ly and lx and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. According to Rankine Grashoff theory (A) (wx /wy ) = (ly /lx ) (B) (wx/wy) = (ly/lx)² (C) (wx /wy ) = (ly /lx )4 (D) None of these

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The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept (A) 0.7 (B) 0.8 (C) 0.9 (D) 0.6

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When the slab is supported on all the four edges and the ratio of long span to short span is small, bending takes place along both the spans, such a slab is known as (a) Slab spanning in one direction (b) One way slab. (c) Slab spanning in two direction. (d) Two-way slab.

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