Cell The Unit Of Life

Sieve tube elements lose their nucleus but retain cytoplasm for transporting nutrients. Tracheid, a type of xylem cell, loses its cytoplasm and nucleus to facilitate water transport. Tapetum is a nutritive tissue in anthers which can be multinucleated.Synergids are haploid cells in the embryo sac of angiosperms formed by mitotic division.

Here’s the matching at a glance:Succinate dehydrogenase (P) is a component of Complex II of the mitochondrial ETC, embedded in theinner mitochondrial membrane⇒ iiPyruvate dehydrogenase (Q) operates in themitochondrial matrix⇒ iiiLactate dehydrogenase (R) functions in thecytoplasm⇒ iChloroplast (and cyanobacterial) ATP synthase (S) is located on thethylakoid membrane⇒ ivSo the correct set is$ $which corresponds toOption A.

The classification of chromosomes asmetacentric, sub-metacentric, acrocentric, andtelocentricis based on theposition of the centromere.✅Correct Answer: Option A — CentromereExplanation:Metacentric: Centromere is in the middle; both arms are equal.Sub-metacentric: Centromere is slightly off-center; arms are unequal.Acrocentric: Centromere is near one end; one arm is very short.Telocentric: Centromere is at the terminal end; effectively one arm.