Home
Class 11
BIOLOGY
The most recent theory, according to whi...

The most recent theory, according to which the metazons had a polyphyletic origin from different unicellular groups is given by

A

Woodruff

B

Preston

C

Greenberg

D

Witcherman

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • CLASSIFICATION OF LIVING ORGANISMS

    SANTRA PUBLICATION|Exercise FILL IN THE BLANKS|126 Videos
  • CLASSIFICATION OF LIVING ORGANISMS

    SANTRA PUBLICATION|Exercise TRUE OR FALSE|126 Videos
  • CLASSIFICATION OF LIVING ORGANISMS

    SANTRA PUBLICATION|Exercise NCERT QUESTIONS|37 Videos
  • CHEMICAL CONSTITUENTS OF LIVING CELLS: BIOMOLECULES

    SANTRA PUBLICATION|Exercise NCERT Questions|15 Videos
  • DIGESTION AND ABSORPTION

    SANTRA PUBLICATION|Exercise NCERT QUESTIONS|9 Videos

Similar Questions

Explore conceptually related problems

Which of the following is not correct? (a) Robert Brown discovered the cell. (b) Schleiden and Schwann formulated the cell theory. (c) Virchow explained that cells are formed from pre-existing cells. (d) A unicellular organism carries out its life activities within a single cell.

According to the Neo-Darwinian theory, which of the following is responsible for the origin of new species

Einstein established the idea of photons on the basis of Planck's quantum theory. According to his idea, the light of frequency f or wavelength lamda is infact a stream of photons. The rest mass of each photon is zero and velocity is equal to the velocity of light (c) = 3 xx 10^(8) m.s^(-1) . Energy, E = hf, where h = Planck's constant = 6.625 xx 10^(-34)J.s . Each photon has a momentum p = (hf)/(c) , although its rest mass is zero. The number of photons increase when the intensity of incident light increases and vice-versa. On the other hand, according to de Broglie any stream of moving particles may be represented by progressive waves. The wavelength of the wave (de Broglie wavelength) is lamda = (h)/(p) , where p is the momentum of the particle. When a particle having charge e is accelerated with a potential difference of V, the kinetic energy gained by the particle is K= eV. Thus as the applied potential difference is increased, the kinetic energy of the particle and hence the momentum increase resulting in a decrease in the de Broglie wavelength. Given, charge of electron, e = 1.6 xx 10^(-19)C and mass = 9.1 xx 10^(-31) kg . Two stationary electrons are accelerated with potential difference V_(1) and V_(2) respectively such that V_(1) : V_(2) = n . The ratio of their de Broglie wavelength

[A]: Protostele is most simple primitive type of stele. [R]: According to Histogen theory there are three distinct apical layers which give rise to distinct tissue system of the body.

Li exhibits certain properties which are different from that of other group-1 elements. Explain.

Given:1 - Natural selection, 2 - variations and their inheritance ,3 - survival of the fittest, 4 - struggle for existence.According to Darwin in,which of the following represent the correct sequence of the events in the origin of the new sepecies?

Given : 1 = Natural selection , 2 = Variations and their inheritance , 3 = Survival of the fittest , 4 = struggle for existence According the Darwinism, which of the following represents the correct squence of events in the origin of new species ?

Electron in a hydrogen atom undergoes transition from n_1 to n_2 , where n_1 and n_2 are the principal quantum numbers of two given states. According to Bohr's theory , if the time period of the electron in the initial state be eight times that in the final state , the possible values of n_1 and n_2 will be, respectively

Prove that the locus of the center of a circle, which intercepts a chord of given length 2a on the axis of x and passes through a given point on the axis of y distant b from the origin, is a parabola.