The Tenth Schedule of the Indian Constitution, added by the Constitution (Fifty-Second Amendment) Act, 1985, is commonly known as the anti-defection law. It lays down the process for disqualification of legislators who defect from their political parties, ensuring political stability and discouraging opportunistic shifts in allegiance.

The other options:

• Seventy-Fourth Amendment: Related to urban local governance.
• Twelfth Schedule: Deals with the functions of municipalities.
• Forty-Second Amendment: Known for introducing several changes, including the term "socialist" and "secular" in the Preamble, but not anti-defection.

• Sangrur and Barnala: These districts share a boundary as Barnala was carved out of Sangrur.
• Gurdaspur and Hoshiarpur: These districts share a boundary.
• Ferozepur and Mansa: These districts do not touch each other, as Moga and Bathinda lie between them.
• Fazilka and Sri Muktsar Sahib: These districts share a boundary.

The State Tree of Punjab is Shisham (Dalbergia sissoo), also known as Indian Rosewood. This tree is valued for its strong and durable timber and holds cultural and ecological significance in Punjab.

To compare the sizes:

• Decimetre: 0.1 metres
• Kilometre: 1,000 metres
• Nautical mile: 1,852 metres
• Yard: 0.9144 metres

Among these, the nautical mile is the largest unit, used primarily in maritime and aviation navigation.

Alveoli are tiny air sacs located in the lungs, where the exchange of oxygen and carbon dioxide takes place. They are essential for the respiratory system, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled during breathing.