What is the difference between Matrotrophy and Lecithotrophy?

In “lecithotrophy,” nutrients are provided by the yolk of the ovum, whereas in “matrotrophy,” nutrients are provided by some alternative means, such as a placenta (Wourms, 1981).

What is Matrotrophy in plants?

Matrotrophy is a form of maternal care during organism development, associated with live birth (viviparity), in which the embryo of an animal or flowering plant is supplied with additional nutrition from the mother (e.g. through a placenta).

What does Lecithotrophic mean?

lecithotrophy (uncountable) A form of development in which the embryo receives no nutrition other than the yolk originally contained within its egg.

What is the meaning of Oviparity?

Here, oviparity is defined as the oviposition of an embryo within a shelled egg requiring some period of embryonic development outside of the female’s reproductive tract (Guillette, 1993).

What animals are Lecithotrophic?

(1) Lecithotrophy is the simplest and the most ancestral mode of nutrition among internally-gestating elasmobranchs, found in various lineages. The dry intrauterine embryo loses organic weight during gestation. Some spiny dogfishes (Squaliformes) and electric rays (Torpediniformes) are typical examples of this mode.

What is planktonic larva?

Planktonic larval stage in life gives species a way to disperse. The larvae develop while adrift at sea, often going through many stages before reaching adult body form. Looking like something out of a Dr. Seuss book, the larvae often don’t resemble their adult form.

What is oviparity and example?

Oviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, most reptiles, and all pterosaurs, dinosaurs (including birds), and monotremes.

What is oviparity give an example?

Animals that reproduce by laying eggs are called oviparous animals. In these animals, the process of both fertilization and embryo development does not occur inside the mother. Birds and frogs are examples of oviparous animals.

What is the calyptra derived from?

archegonia
Calyptra is derived from archegonia. Calyptra is an enlarged archegonial venter that protects the capsule containing the embryonic sporophyte. The calyptra is usually lost before the spores are released from the capsule. The shape of the calyptra can be used for identification purposes.

What is Lecithotrophic?

Noun. lecithotrophy (uncountable) A form of development in which the embryo receives no nutrition other than the yolk originally contained within its egg.

What is pelagic larval?

Pelagic larvae can disperse large distances, colonize new territory, and move away from habitats that has become overcrowded or otherwise unsuitable. A long pelagic larval phase can help a species to break its parasite cycles. Pelagic larvae avoid benthic predators.

What is a planktonic culture?

Planktonic bacteria are free-living bacteria. They are the populations that grow in the familiar test tube and flask cultures in the microbiology laboratory. The opposite mode of growth is the adherent, or sessile, type of growth. Planktonic bacteria have been recognized for centuries.

What is the meaning of planktonic?

: the passively floating or weakly swimming usually minute animal and plant life of a body of water.

What is meant by oviparity?

What is difference between oviparity and ovoviviparity?

The key difference between oviparity, ovoviviparity and viviparity is that oviparity is the trait of laying eggs, while ovoviviparity is the development of embryos inside eggs that are retained within the mother’s body until they are ready to hatch, and viviparity is giving birth to young ones directly.

What is the description of oviparity?

oviparity, expulsion of undeveloped eggs rather than live young. The eggs may have been fertilized before release, as in birds and some reptiles, or are to be fertilized externally, as in amphibians and many lower forms.

What is the meaning of calyptra?

Definition of calyptra : a hoodlike structure in a plant especially : haploid tissue forming a membranous hood over the capsule in a moss.

What does calyptra mean?

What is the meaning of matrotrophic?

matrotrophic Applied to a mode of embryo development in which the source of nourishment is not limited to the yolk, but is supplemented by nourishment derived from the mother. See also PLACENTOTROPHIC. Compare LECITHOTROPHIC. Source for information on matrotrophic: A Dictionary of Zoology dictionary. matrotrophic | Encyclopedia.com

Why is matrotrophy important in plants?

In plants, matrotrophy is considered a critical evolutionary development preceding the origin of embryophytes and therefore essential to the evolution of land plants. Matrotrophy is facilitated by cytological and ultrastructural modifications on one or both sides of the generational junction, a region called the placenta.

What is culture according to anthropologists?

There are, so I understand, something like a hundred different definitions of culture used by anthropologists. The word ‘culture’ comes from the Latin cultus, which means ‘care’, and from the French colere which means ‘to till’ as in ’till the ground’.

What exactly is culture?

This is the definition of culture usually found in Anthropology textbooks: Culture is “that complex whole that which includes knowledge, belief, art, morals, law, customs, and any other capabilities and habit acquired by man as a member of society.” Whew! What a mouthful.

https://www.youtube.com/watch?v=_n1gukabN_c