Question

A protistan which is commonly called plant and animal both
A. Navicula
B. Noctiluca
C. Vorticella
D. Euglena

Answer 1

Protistan is commonly called plant and animal both as it is linked with both the kingdoms of animals and plants. Its feeding is mixotrophic. When the light is accessible, it obtains food by photosynthesis, in the dark, it fascinates saprophytic food from the neighbouring water molecules.

Complete answer:
Let's first understand each option one by one.
Euglena-Euglena is a eukaryotic single-celled organism; it contains essential organelles found in more complex life forms. These protozoa are autotrophs, which means they can photosynthesize to produce their food, such as plants, and xeno bacteria can capture and absorb food.
When EuglenaEuglena acts as an autotrophic organism, it uses chloroplasts (which have a greenish tint) to produce sugars through photosynthesis.
Acting as a heterotrophic organism, EuglenaEuglena passes through food particles and is consumed through phagocytosis. In other words, it absorbs food through cell membranes. Due to this adaptation, many euglenoids are considered a mixed diet.
Most Euglena species have photosynthetic chloroplasts in their cell bodies, which, like plants, can feed them on their own. However, they can also eat heterotrophic animals such as animals. This is because EuglenaEuglena has animal and plant characteristics.
Navicular-Structurally, it can be divided into two parts - a silicon cell wall (called frustule) and protoplast. The cell wall consists of a pectin substance impregnated with silica. The cell wall consists of two overlapping parts called epithelium and mortgage. Epitheca remains on the mortgage as box protection. Navicula sp. is a boat-shaped diatom. Its name comes from the Latin word Navicula, which means "little ship" - referring to its recognizable shape.
Noctiluca-The body of Noctiluca is spherical, about 1.5 mm in diameter, gelatinous and transparent, covered with a thick membrane, protoplasm is highly vacuole and has sensitive fibres. There is a groove in the membrane which remains floating above it but marks the morphological side of the ventral. The mouth is elongated, and a soft flap called a mismatched tooth, which is a transverse flagellum, extends into the groove. Near the track are the nucleus, whip and mouth, all of which are called polar masses. From the polar group, the protoplasmic threads branch off, and anastomoses enter. Its central skin glows and produces a bluish-green glow at night, hence the name.
Vorticella-Vorticella is known as a bellflower. It grows on the stems of freshwater or marine plants and appears as a white border to the naked eye. Vorticella is solitary, but the form of Carchesium associated with it is colonial. The base of the handle or handle remains attached to the object of attachment and can contract. The handle is formed by an extension of the body, wrapped with cuticles and shrinking with the help of muonema. The bell has a thick patch. Disc-like structures pressed against the ground are called peristomes.
So, the correct answer is “Option D”.

Note:
Euglena obtains carbohydrate nutrients through photosynthesis and nitrogen nutrients through absorption from the environment. Euglenoids can glide and swim with their whips, or flow across the substrate in a wavy, deformed, shrinking motion called metabolism. The cytoplasm of EuglenaEuglena and other euglenoids contain many granules to store paramylon starch. Euglenoids perceive light using a red-pigmented eyespot, or stigma, and a paraflagellar body, which is located at the base of the emerging bull. Plant-like, animal-like and saprophytic diets can be found in EuglenaEuglena. However, his Holocaust diet is questionable. Euglenoid cells are covered by a pellicle made of braided and braided protein material that covers the cell in a spiral arrangement from top to back. Freshwater euglenoids have contractile vacuoles.