Description : What is bioluminescence?
Last Answer : A: Bioluminescence is the production and emission of light by living organisms, often used for communication, camouflage, or predation.
Description : Match the entries given in Column A with the appropriate ones in Column B. `{:("Column A","Column B"),(A."Air",(" ")a."Bioluminescence"),(B."Pure wate
Last Answer : Match the entries given in Column A with the appropriate ones in Column B. `{:("Column A","Column B" ... "Glow warm",(" ")d."Heterogeneous medium"):}`
Description : Planaria possesses high capacity of (a) metamorphosis (b) regeneration (c) alternation of generation (d) bioluminescence.
Last Answer : (b) regeneration
Description : Match the following columns and select the correct option. Column-I Column-II (A) Gregarious, polyphagous pest (i) Asterias (B) Adult with radial symmetry and larva with bilateral symmetry (ii) Scorpion (C) Book lungs (iii) Ctenoplana ... ) (iii) (c) (iii) (ii) (i) (iv) (d) (ii) (i) (iii) (iv)
Last Answer : (b) (iv) (i) (ii) (iii)
Description : The ability of Vibrio fischerito produce bioluminescence chemicals only when a certain population density has been reached is an example of A.Liebig's law of the minimum B.Shelford's law of tolerance C.quorum sensing D.Heisenberg's principle of uncertainty
Last Answer : C.quorum sensing
Description : Many living organisms exhibit the unique property of producing visible light. The compound that is oxidized with subsequent light emission is usually referred to as luciferin. What is the enzyme which catalyzes the reaction known as?
Last Answer : ANSWER: Luciferase
Description : What term describes one organism eaing another organism?
Last Answer : Feel Free to Answer
Description : What term best describes where an organism lives is it nichehabitatcommuntityhome?
Last Answer : What is the answer ?
Description : Which term describes an organism ability to maintain a stable internal environment?
Last Answer : locomotion
Description : Which one of the followings is/are correct definition of Habitat? (1) A complex of several types of communities (2) Natural environment of a living organism (3) The place where one would ... environment of a living organism and the place where one would go find the particular living organism.
Last Answer : (4) Natural environment of a living organism and the place where one would go find the particular living organism. Explanation: Habitat is generally defined as the natural environment ... an area of uniform environmental conditions associated with a particular community of plants and animals
Description : When a natural predator (living being) is applied on the other pathogen organism to control them, this process is called (a) artificial control (b) confusion technique (c) biological control (d) genetic engineering.
Last Answer : (c) biological control
Description : Which one of the followings is/ are correct definition of Habitat? (1) A complex of several types of communities (2) Natural environment of a living organism (3) The place where one would ... environment of a living organism and the place where one would go find the particular living organism.
Last Answer : Natural environment of a living organism and the place where one would go find the particular living organism.
Description : The blueness of the sky is mainly due to -------? A. The scattering of sunlight by air molecules (Answer) B. The presence of water vapor C. Absorption of blue light by the air D. Emission of blue light by the atmosphere
Last Answer : A. The scattering of sunlight by air molecules (Answer)
Description : What describes a worm that breaks down the bodies of dead organism?
Last Answer : maggotDetrivore
Description : Which one of the following terms describes not only the physical space occupied by an organism, but also its functional role in the community of organisms? (1) Eco-niche (2) Ecosystem (3) Ecotone (4) Habitat
Last Answer : (2) Ecosystem Explanation: An ecosystem is a community of living organisms in conjunction with the nonliving components of their environthent, interacting as a system. The nature of the organisms-the ... individuals are capable of carrying out, and the relative efficiency with which they do so.
Description : Which one of the following terms describes not only the physical space occupied by an organism, but also its functional role in the community of organisms ? (1) Eco-niche (2) Ecosystem (3) Ecozone (4) Habitat
Last Answer : Ecosystem
Description : What term describes the normal part of cell development where the cell no longer divides in the cell cycle and chooses to undergo natural cell death?
Last Answer : apoptosis
Description : What term describes the natural waviness of wool fiber?
Last Answer : Crimp
Description : Which term is defined as the emission of energy from subatomic particles?
Last Answer : Radiation
Description : Emission of light in the visible region after absorbing certain electromagnetic radia- tions is called?
Last Answer : Photoluminescence
Description : Absorption of light of one wave length by a substance and the re-emission of light of greater wavelength is called?
Last Answer : Fluorescence
Description : When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in - (1) Raman spectra (2) Absorption spectra (3) Emission spectra (4) Fluorescence
Last Answer : (3) Emission spectra Explanation: When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it ... to the energy the electron has released at each stage °fits fall back to its original state.
Description : The mercury and sodium street lamps light up because of – (1) Atomic emission (2) Atomic absorption (3) Electron emission (4) Electron absorption
Last Answer : (1) Atomic emission Explanation: The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter ... energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
Description : The sky appears blue because of – (1) Atmospheric water vapour (2) Scattering of light (3) Reflection on sea water (4) Emission of blue wavelength by the sun
Last Answer : (2) Scattering of light Explanation: The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is ... reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
Description : Stars appear twinkling because of ______ of light. (1) Reflection (2) Scattering (3) Emission (4) Absorption
Last Answer : (2) Scattering Explanation: The stars' light must travel through the Earth's multi-layered atmosphere, and as it does so it is refracted (bent) multiple times and in random directions. The phenomenon of ... star wink as though it is in motion. It is this action that our eyes translate as twinkling.
Description : LED stands for _________ A. Low Emission Display B. Liquid Emitting Display C. Less Emitting Diode D. Light Emitting Diode
Last Answer : D. Light Emitting Diode
Description : The first laser emitted a. Pulses of 694 nm red light b. A continuous red beam c. Pulses of white light from a helical flashlamp d. Spontaneous emission
Last Answer : a. Pulses of 694 nm red light
Description : Which of the following contributes to the broadening of laser emission bandwidth? a. Doppler shift of moving atoms and molecules b. Amplification within the laser medium c. Coherence of the laser light d. Optical pumping of the laser transition
Last Answer : a. Doppler shift of moving atoms and molecules
Description : Laser light is ______ emission. a. Coherent b. Stimulated c. Spontaneous d. Coherent and stimulated
Last Answer : d. Coherent and stimulated
Description : A photochemical reaction is (A) Accompanied with emission of light (B) Catalysed by light (C) Initiated by light (D) All (A), (B) & (C)
Last Answer : (C) Initiated by light
Description : A photochemical reaction is __________ light. (A) Initiated by (B) Accompanied with emission of (C) Catalysed by (D) Used to convert heat energy into
Last Answer : (A) Initiated by
Description : A pn-junction diode emits light by spontaneous emission ∙ A. LED ∙ B. APD ∙ C. PIN
Last Answer : A. LED
Description : They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser). ∙ A. Theodore Maiman ∙ B. KC Kao and GA Bockham ∙ C. Charles Townes and Arthur Schawlow ∙ D. Kapron, Keck and Maurer
Last Answer : C. Charles Townes and Arthur Schawlow
Description : ____ is a light that can be coherent ∙ a. Spontaneous emission ∙ b. Monochromatic and in-phase ∙ c. Narrow beam divergence ∙ d. Monochromatic
Last Answer : ∙ b. Monochromatic and in-phase
Description : The first laser emitted ∙ a. Pulses of 694 nm red light ∙ b. A continuous red beam ∙ c. Pulses of white light from a helical flash lamp ∙ d. Spontaneous emission
Last Answer : ∙ a. Pulses of 694 nm red light
Description : Which of the following contributes to the broadening of laser emission bandwidth? ∙ a. Doppler shift of moving atoms and molecules ∙ b. Amplification within the laser medium ∙ c. Coherence of the laser light ∙ d. Optical pumping of the laser transition
Last Answer : Doppler shift of moving atoms and molecules
Description : Laser light is ______ emission. ∙ a. Coherent ∙ b. Stimulated ∙ c. Spontaneous ∙ d. Coherent and stimulated
Last Answer : ∙ d. Coherent and stimulated
Description : LASER stands for: a. Light Amplification by Simulated Emission of Radiation b. Light Amplification by Stimulated Emission of Radiation c. Light Amplification by Simulated Emitted Rays d. Light Amplification by Stimulated Emitted Rays
Last Answer : b. Light Amplification by Stimulated Emission of Radiation
Description : They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser).
Last Answer : Charles Townes and Arthur Schawlow
Description : Laser is the acronym for a) Light Amplification by Stimulated Emission of Radiation b) Light Amplification by Spontaneous Emission of Radiation c) Light Amplified by Stimulated Emission of Radiation d) Light Amplification by Standard Emission of Radiation
Last Answer : a) Light Amplification by Stimulated Emission of Radiation
Description : The emission of number of photo electrons depends upon a) The colour of the body b) The frequency of incident light c) The intensity of light d) All of the above
Last Answer : c) The intensity of light
Description : Light waves can cause photoelectric emission in a) Metals b) Alkali metals c) Insulators d) None of the above
Last Answer : c) Insulators
Description : When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in (1) Raman spectra (2) Absorption spectra (3) Emission spectra (4) Fluorescence
Last Answer : Emission spectra
Description : The mercury and sodium street lamps light up because of : (1) Atomic emission (2) Atomic absorption (3) Electron emission (4) Electron absorption
Last Answer : Atomic emission
Description : Stars appear twinkling because of ......... of light. (1) Reflection (2) Scattering (3) Emission (4) Absorption
Last Answer : Scattering
Description : Differentiate between spontaneous and stimulated emission of light with diagram.
Last Answer : Spontaneous emission Stimulated emission Excited atoms comes to ground state on its own accord Excited atoms comes to ground state after interaction with incident photon. Radiations are in random ... Number of photons emitted are less Number of photons emitted are more
Last Answer : The principle of emission of electrons from a metal surface, under the influence of light is known as Photo electric emission.
Description : What term describes a test that scientists use to answer a question?
Last Answer : Experiment
Description : What term describes a educated guess of the answer to a problem?
Description : Which of the following is the basic characteristic of a living organism? (a) Ability to move (b) Ability to reproduce (c) Ability to eat (d) Ability to breathe
Last Answer : Ans:(b)