Parenchyma cells containing ergastic substances are called idioblasts. Tannin cells, cells filled with raphides, etc. constitute idioblast. An idioblast is an isolated plant cell that differs from neighboring tissues. It carries out storage of reserves.

Correct Option: B

Parenchyma cells containing ergastic substances are called idioblasts. Tannin cells, cells filled with raphides, etc. constitute idioblast. An idioblast is an isolated plant cell that differs from neighboring tissues. It carries out storage of reserves.

In citrus fruits such as oranges, the nuclear cells that surround the embryo start dividing and protrude into the embryo sac. These develop into embryos; thus resulting in the presence of more than one embryo inside each ovule. This condition is known as polyembryony.

Correct Option: C

In citrus fruits such as oranges, the nuclear cells that surround the embryo start dividing and protrude into the embryo sac. These develop into embryos; thus resulting in the presence of more than one embryo inside each ovule. This condition is known as polyembryony.

Prothallus is usually the gametophyte stage in the life of a fern or other pteridophyte. The prothallium develops from a germinating spore. It is a short-lived and inconspicuous heart-shaped structure.

Correct Option: A

Prothallus is usually the gametophyte stage in the life of a fern or other pteridophyte. The prothallium develops from a germinating spore. It is a short-lived and inconspicuous heart-shaped structure.

Root hairs are tubular-shaped tip-growing cells that arise from epidermal cells known as trichoblasts, behind the tips of young roots. Like all tip-growing cells, root hairs grow by the addition of cell wall precursors to the tip delivered by vesicles from the endomembrane system.

Correct Option: C

Root hairs are tubular-shaped tip-growing cells that arise from epidermal cells known as trichoblasts, behind the tips of young roots. Like all tip-growing cells, root hairs grow by the addition of cell wall precursors to the tip delivered by vesicles from the endomembrane system.

Unlike cells of animals and other eukaryotes, bacterial cells do not contain a nucleus and rarely harbour membrane-bound organelles. Bacteria are prokaryotes, which, by definition, are cells that don’t possess membrane-bound organelles. Mitochondria are membrane-bound organelles.

Correct Option: D

Unlike cells of animals and other eukaryotes, bacterial cells do not contain a nucleus and rarely harbour membrane-bound organelles. Bacteria are prokaryotes, which, by definition, are cells that don’t possess membrane-bound organelles. Mitochondria are membrane-bound organelles.