Sullage water is_______
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In stems, the protoxylem lies towards the centre and the metaxylem lies towards the periphery of the organ. This type of primary xylem is called _____________.
Why does a black board appears black in colour?
The exchange of materials between blood and interstitial fluid occurs only at the _____.
The innermost layer is the core with a radius of about ___________ km.
"Tsunami" is the name given to which of the following?
Which of the following trees shed their leaves once in a year?
Earth is also known as _______.