Look at the diagram below. ray 1 from the sun moves through air and falls on the surface of a lake. ray 2 is a ray which travels from the surface of the lake at the point ray 1 strikes the lake, and moves towards air. ray 1 and ray 2 make the same angle with the surface of the lake. ray 1 bends towards the vertical when it enters the lake as ray 3 which statement is correct about ray 3? ray 3 is the part of ray 1 which is reflected. ray 3 is the part of ray 1 which is refracted. the part of ray 1 which is absorbed by the lake is represented by ray 3. the angle ray 3 makes with the lake equals the angle ray 1 makes with the lake.

Plants grown in full sunlight produced more biomass, tillers and leaves, and allocated a larger proportion of their total production to roots than plants grown in shade. Thus, shading reduces the rate of growth, number of tillers, and ability to replace leaf area lost to herbivory for B. tectorum.

The shade-tolerant plants are capable of photosynthesis using light at such wavelengths. Shade-tolerant plants are thus adapted to be efficient energy-users. In simple terms, shade-tolerant plants grow broader, thinner leaves to catch more sunlight relative to the cost of producing the leaf.

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