Is a pinnularia an autotroph?

1. Is Pinnularia a Heterotroph or Autotroph?
2. What are the characteristics of Pinnularia?
3. What is raphe Pinnularia?
4. Are Apicomplexans heterotrophic or autotrophic?
5. Is Giardia heterotrophic or autotrophic?
6. How do Chlamydomonas reproduce?
7. What is Gongrosira stage?
8. What is the function of Auxospore?
9. What is Oogamous type of reproduction?
10. What are the important morphology of diatoms?
11. What is an Epitheca?
12. Does asexual reproduction happen fast or slow?
13. Is Apicomplexans a Mixotrophic?
14. Are Apicomplexans unicellular or multicellular?

Is Pinnularia a Heterotroph or Autotroph?

Kingdom Protista includes all the unicellular eukaryotes. They are predominantly aquatic organisms with most of them being marine. They include both autotrophs as well as heterotrophs. Gonyaulax, Euglena, Amoeba and Pinnularia all belong to kingdom Protista, all are unicellular and eukaryotic organisms.

What are the characteristics of Pinnularia?

Pinnularia are elongated elliptical unicellular organisms. Their cell walls are composed chiefly of pectic substances on a rigid silica framework. Their walls are composed of two halves called thecae (or less formally, valves.) These halves overlap like a Petri dish and its cover.

What is raphe Pinnularia?

The raphe is wedge shaped in transverse section. It has circular thickening called central nodules in the centre. Similar thickening also present at the outer ends of raphe. These are called polar nodules. These nodules open to the external aqueous medium.

Are Apicomplexans heterotrophic or autotrophic?

The Apicomplexa (Telosporea, Sporozoa) are parasitic. 1 heterotrophic protists that form uniformly banana-shaped uninucleate stages. Apicomplexans move by gliding motion, and at least one stage is characterized by apical secretory organelles releasing their content through a microtubule-anchored ring.

Is Giardia heterotrophic or autotrophic?

Several major groups (not necessarily a taxonomic breakdown): 1 - Protozoa - use cilia, flagella, or pseudopodia to move around. - most are heterotrophs, but some autotrophs are also in this group. - examples are amoebas, paramecium, euglena, even some diseases like malaria, sleeping sickness and giardia.

How do Chlamydomonas reproduce?

Chlamydomonas sexually reproduces through the involvement of two gametes: Isogamy: Both of the gametes that are produced are similar in shape, size and structure. These are morphologically similar but physiologically different. Also, Isogamy is most common in sexually reproducing Chlamydomonas.

What is Gongrosira stage?

Each part develops cysts or hypnospores. This stage of Vaucheria is called Gongrosira stage as it resembles the alga Gongrosira. The cyst ruptures in favourable conditions and protoplast comes out by amoeboid movement. This protoplast become spherical and secretes new wall. It germinates to form new filament.

What is the function of Auxospore?

Auxospores typically play a role in growth processes, sexual reproduction or dormancy. Auxospores are involved in re-establishing the normal size in diatoms are successive mitotic cell divisions leads to a decrease in cell size.

What is Oogamous type of reproduction?

Oogamy is a extreme form of anisogamy where the gametes differ in both size and form. In oogamy the large female gamete (also known as ovum) is immobile, while the small male gamete (also known as sperm) is mobile. Oogamy is a common form of anisogamy, almost all animals and land plants being oogamous.

What are the important morphology of diatoms?

Diatoms have two distinct shapes: a few (centric diatoms) are radially symmetric, while most (pennate diatoms) are broadly bilaterally symmetric. A unique feature of diatom anatomy is that they are surrounded by a cell wall made of silica (hydrated silicon dioxide), called a frustule.

What is an Epitheca?

Definition of epitheca

1 : an external calcareous layer investing the lower portion of the theca of many corals. 2 : the outer or upper half or valve of the diatom frustule — compare hypotheca.

Does asexual reproduction happen fast or slow?

Asexual reproduction can be very rapid. This is an advantage for many organisms. It allows them to crowd out other organisms that reproduce more slowly. Bacteria, for example, may divide several times per hour.

Is Apicomplexans a Mixotrophic?

Apicomplexans are evolutionarily derived from mixotrophic algae, a realization that first came with sequencing a plastid genome in Plasmodium and localizing it into a cryptic, non-photosynthetic organelle called 'the apicoplast' (Gardner et al., 1991; McFadden et al., 1996; Wilson et al., 1996).

Are Apicomplexans unicellular or multicellular?

The Apicomplexa are unicellular and spore-forming. All species are obligate endoparasites of animals, except Nephromyces, a symbiont in marine animals, originally classified as a chytrid fungus. Motile structures such as flagella or pseudopods are present only in certain gamete stages.