Which of the following trees shed their leaves once in a year?
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Why does a black board appears black in colour?
The exchange of materials between blood and interstitial fluid occurs only at the _____.
Sullage water is_______
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 _____________.
The innermost layer is the core with a radius of about ___________ km.
Limonitic ore is the ore of which metal?
Limonite is one of the two principal iron ores, the other being hematite, and has been mined for the production of iron.
Earth is also known as _______.
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