Seive tubes are the constitutent of

The idea of residual powers in Indian constitution has been taken from the constitution of

The concept of Judicial Review in our Constitution has been taken from the Constitution of:

Assertion (A): Seive tubes are made up of sieve plates that help in conduction. Reason (R): Phloem parenchyma gives mechanical support.

Canal rays produced when hydrogen atoms are taken in the discharge tube constitutes

Canal rays produced when hydrogen atoms are taken in the discharge tube constitutes