NEET BIOLOGY

Detailed explanation-1: -The companion cells contain nucleus and large number of ribosomes and mitochondria.

Detailed explanation-2: -Companion cells showed a dense cytoplasm and various small vacuoles. They also revealed their characteristic large nucleus and abundant mitochondria.

Detailed explanation-3: -Among other adaptations, companion cells therefore contain many mitochondria. This allows them to carry out cellular respiration at a high rate and, hence, release lots of energy.

Detailed explanation-4: -The companion cells have dense protoplasts which contain the typical organelles of plant cells, including chloroplasts and many ribosomes. The sieve elements and companion cells are interconnected by numerous branched plasmodesmata. The companion cells degenerate when the associated sieve elements cease to function.

Detailed explanation-5: -The companion cells are specialized parenchyma cells in the phloem tissues of the angiosperms. They are nucleated living cells with several ribosomes, plastids, and mitochondria. Their nuclei and nucleoli are relatively large (an indication of being metabolically active).