Question

define photosynthesis
18.4 Which of the following statement(s) is (are) true about excretion in human beings?

I. Kidneys are the primary excretory organs.

II. The bladder is muscular, so it is under nervous control.

III. Each kidney has large numbers of filtration units called nephrons.

IV. Urine is stored in the urethra until the urge of passing it out.

(a) I and II only (b) I and III



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Answer 1

Answer:

Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.

2, 3 and 4

in 1, not only kidneys are primary organs but also ureter and urinary bladder.