Biology Questions

Nostoc is a prokaryote. Prokaryotic cells lack membrane bound organelles and well organized nucleus, that is nuclear envelope is absent in these cells.

The nuclear envelope, also known as the nuclear membrane, a bilayer membranes which surrounds the nucleus, and in eukaryotic cells it encases the genetic material.

Here from the above options, Algae is an Autotroph.

Autotrophs : 

An Autotroph is also called as Producer, is an organism that produces complex organic compounds from simple substances present in its surroundings, generally using energy from light or inorganic chemical reactions.

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.

The major glands of the endocrine system include the

pineal gland,

pituitary gland,

pancreas,

ovaries,

testes,

thyroid gland,

parathyroid gland,

hypothalamus and

adrenal glands.