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I have some ether in an exchange but when I searched it on etherscan.io it is showing
There are no matching entries
there I got to know exchanges have the balances on their own wallet address, but if my address(from exchange account) is not there on blockchain how I am able to send ether from outside my exchange account to the address?
By "exchange" I assume you mean a centralized exchange.
Exchanges do have real wallets. Whenever you deposit any asset to an exchange you send it to one of their (hot) wallets and after that the exchange's inner logic perhaps sends it somewhere further.
When trading inside an exchange it's all done inside the exchange's internal ledgers to minimize costs and delays. When you transfer assets out again the exchange sends them from a real wallet.
This is a good question.
The addresses from an exchange are handled in various different ways based on the internal decision of the exchange.
With some you'll find that the wallet address shown on your account on the exchange is similar to any other wallet address, and its transactions are viewable on etherscan.
With others, you might find that the address is a proxy for the exchange to maintain some sort of internal check's and balances (to avoid user sending incorrect tokens to the incorrect address)...
And multiple other ways that exchanges can and do handle deposits and withdrawals.
