Who gave Telome theory?
Zimmermann’s ‘theory’ was really a description of three fundamental steps — overtopping, planation, and webbing — for transforming a stem (a telome) into a laminated leaf blade by the fusion of lateral branch systems or telomes (Figure 1).
What is fertile Telome?
Meaning of Telome Theory: Functionally, telomes are of two types viz., fertile telome and sterile telome. If the ultimate branch is terminated by a sporangium then it is a fertile telome (Fig. 7.134), whereas those terminal branches without sporangia are called sterile (vegetative) telomes (Fig. 7.134).
What is Telome botany?
Definition of telome : a hypothetical plant structure in a theory of the evolution of leaves and sporophylls in vascular plants that consists of one of the vegetative or reproductive terminal branchlets of a dichotomously branched axis.
Who discovered Rhynia?
Description. Rhynia gwynne-vaughanii was first described as a new species by Robert Kidston and William H. Lang in 1917. The species is known only from the Rhynie chert in Aberdeenshire, Scotland, where it grew in the vicinity of a silica-rich hot spring.
What is a telome explain the steps involved in the origin of Megaphyllous leaves through telome theory?
According to the telome theory, megaphylls evolved from the three-dimensional lateral branches of early vascular land plants in a hypothetical series of three transformations; first, the formation of determinate lateral branches (overtopping); second, the development of ‘flattened’ branch systems (planation); and third …
What is a Apogamy in biology?
Apogamy is the development of a plant without the union of gametes. It involves the development of a sporophyte from a gametophyte without fertilization.
Do horsetails have Microphylls?
The clubmosses and horsetails have microphylls, as in all extant species there is only a single vascular trace in each leaf. These leaves are narrow because the width of the blade is limited by the distance water can efficiently diffuse cell-to-cell from the central vascular strand to the margin of the leaf.
What are the two species of Rhynia?
gwynne-vaughanii belongs in the vascular plants, while R. major belongs among the bryophytes. Accordingly, he transferred it to a new genus as Aglaophyton, leaving R. gwynne-vaughnii as the only species of Rhynia.
What is the class of Rhynia?
Rhyniopsida
Rhynia
| Rhynia Temporal range: | |
|---|---|
| Subdivision: | †Rhyniophytina |
| Class: | †Rhyniopsida |
| Order: | †Rhyniales |
| Family: | †Rhyniaceae |
What is the difference between apogamy and apomixis?
The key difference between apospory and apogamy is that in apospory, the gametophyte develops directly from the 2n sporophyte, while in apogamy, the embryo develops without undergoing fertilization. In apomixis a meiotic division is suppressed, and a single division produces diploid offspring.
What is empathy?
What Empathy Involves. Empathy involves the ability to emotionally understand what another person is experiencing. Essentially, it is putting you in someone else’s position and feeling what they must be feeling.
What is empatheia in Greek?
Greek empatheia, literally, passion, from empathēs emotional, from em- + pathos feelings, emotion — more at pathos : the understanding and sharing of the emotions and experiences of another person He has great empathy toward the poor. Test your vocabulary with our 10-question quiz!
Are you emotionally overwhelmed by empathy?
Empathy, after all, can be painful. An “empathy trap” occurs when we’re so focused on feeling what others are feeling that we neglect our own emotions and needs—and other people can take advantage of this. Doctors and caregivers are at particular risk of feeling emotionally overwhelmed by empathy.
What is the difference between empathy and fellow feeling?
empathy – understanding and entering into another’s feelings. fellow feeling, sympathy – sharing the feelings of others (especially feelings of sorrow or anguish) Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.