Biology
The kidneys are stimulated to produce renin

When the pH of the urine decreases
By a decrease in the blood pressure
When the specific gravity of urine rises above 1.10
When the peritubular capillaries are dilated

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Biology
Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with

all gymnosperms, except conifers
only angiosperms
angiosperms and all gymnosperms except conifers
only conifers

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