4. ਸਵਰਨਕਾਈਮਾ ਟਿਸ਼ੂ ਦੇ ਸੈੱਲ ਦੀਆਂ ਕੰਧਾਂ ਕਿਸ ਪਦਾਰਥ ਦੇ ਜਮਾਂ ਹੋਣ ਕਾਰਨ ਸੰਘਣੀਆਂ ਹੋ ਜਾਂਦੀਆਂ

Jo? The cell walls of sclerenchyma
tissue are thickened due to
deposition of which material?
सकलैरनकाईमा ऊतक(टिशु) की सैल दीवारें किस
पदार्थ के जम जाने के कारण मोटी हो जाती हैं?'

Lignin.

Explanation:

Lignin is a material whose deposition is responsible for the thickening of cell walls of sclerenchyma  tissue. Lignin is a organic material present in the cell of the cell. It is responsible for transport of water, provide support to the plant and provide resistance to various stresses. It is mostly present in the woody stem of the tree make the stem rigid and protected the stem against pathogens.

they had freedom from the government and from the affairs