TLS Online TPP Program

#Question id: 12576


Estimates of current rates of extinction

#Unit 10. Ecological Principles
  1. Indicate that we  have reached a  state of  stable equilibrium  in  which  speciation and extinction rates are approximately equal.
  2. Suggest that one-half of all animal and plant species may be gone by the year 2100.
  3. Indicate that rates may be greater than the mass extinctions at the close of the Cretaceous period. 
  4. Indicate that only 1% of all of the species that have ever lived on Earth are still alive.
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TLS Online TPP Program

#Question id: 10923

#Unit 6. System Physiology – Plant

In the modification of translocation pathways, Interference with a translocation pathway by wounding or pruning can alter the patterns established by proximity and vascular connections. In the absence of direct connections between source and sink, vascular interconnections, called

TLS Online TPP Program

#Question id: 10924

#Unit 6. System Physiology – Plant

Due to damage exudation of sap from cut petioles or stems takes place they can be collected. However, quantities of collected sap are small, and the method is technically difficult. A preferable approach for collecting exuded sap is to use an

TLS Online TPP Program

#Question id: 11047

#Unit 6. System Physiology – Plant

As plants absorb water from the soil, they deplete the soil of water near the surface of the roots, This depletion due to

TLS Online TPP Program

#Question id: 11048

#Unit 6. System Physiology – Plant

In vascular plants, phloem is the living tissue that transports the soluble organic compound made during photosynthesis in the form of sugar, The phloem tissue is made up of cells called phloem elements. Which of the following given phloem elements are directly involved in translocation?

TLS Online TPP Program

#Question id: 11049

#Unit 6. System Physiology – Plant

Match the CORRECT combination of the phloem elements with its function.

PHLOEM ELEMENTSFUNCTIONS
P) sieve tube elementsi) for protection and strengthening of the tissue
Q) sieve cellsii) store and release food molecules
R) companion cellsiii) food translocation in angiosperm
S) Phloem parenchyma cells  iv) latex containing cells
T) Phloem fibers and sclereids v) help in flow of solute and show    high, activity metabolic 
U) laticifers vi) food translocation on gymnosperm

TLS Online TPP Program

#Question id: 11050

#Unit 6. System Physiology – Plant

Three dimensional reconstructions of Arabidopsis sieve plates using a staining technique that can be used to image entire plant organs and Open sieve pores are visible as well as callose plug are also visible which technique used to analyze