Following are the borrowed features of Indian constitution from different countries.

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From U.K.
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Nominal Head – President (like Queen)
Cabinet System of Ministers
Post of PM
Parliamentary Type of Govt.
Bicameral Parliament
Lower House more powerful
Council of Ministers responsible to Lowe House
Speaker in Lok Sabha

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From U.S.
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Written Constitution
Executive head of state known as President and his being the Supreme Commander of the Armed Forces
Vice- President as the ex-officio Chairman of Rajya Sabha
Fundamental Rights
Supreme Court
Provision of States
Independence of Judiciary and judicial review
Preamble
Removal of Supreme court and High court Judges

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From USSR
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Fundamental Duties
Five year Plan

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From AUSTRALIA
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Concurrent list
Language of the preamble
Provision regarding trade, commerce and intercourse

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From JAPAN
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Law on which the Supreme Court function

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From WEIMAR CONSTITUION OF GERMANY
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Suspension of Fundamental Rights during the emergency

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From CANADA
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Scheme of federation with a strong centre
Distribution of powers between centre and the states and placing. Residuary Powers with the centre

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From IRELAND
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Concept of Directive Principles of States Policy(Ireland borrowed it from SPAIN)
Method of election of President
Nomination of members in the Rajya Sabha by the President