Home
Class 12
BIOLOGY
Which of the following is incorrect abou...

Which of the following is incorrect about ozone ?
i. The bad ozone is found in the upper part of atmosphere
ii. Thickness is measured in terms of Dobson units
iii. Ozone gas is formed by action on UV rays on molecular oxygen
iv. Ophthalmic problems may increase with ozone depletion

A

iii only

B

i and iv

C

i ii and iii

D

i only

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement about ozone is incorrect, let's analyze each statement one by one: 1. **Statement i**: "The bad ozone is found in the upper part of atmosphere." - This statement is incorrect. The "bad ozone," which is harmful to health and the environment, is primarily found in the troposphere (the lower part of the atmosphere). In contrast, the "good ozone" is found in the stratosphere (the upper part of the atmosphere) and helps to protect life on Earth by absorbing harmful UV radiation. 2. **Statement ii**: "Thickness is measured in terms of Dobson units." - This statement is correct. The thickness of the ozone layer is indeed measured in Dobson units, which quantify the amount of ozone present in a column of the atmosphere. 3. **Statement iii**: "Ozone gas is formed by action on UV rays on molecular oxygen." - This statement is also correct. Ozone (O3) is formed when ultraviolet (UV) light interacts with molecular oxygen (O2), causing it to split into individual oxygen atoms which can then combine with O2 to form ozone. 4. **Statement iv**: "Ophthalmic problems may increase with ozone depletion." - This statement is correct as well. Ozone depletion leads to increased UV radiation reaching the Earth's surface, which can cause various ophthalmic issues, such as cataracts and other eye problems. Based on this analysis, the only incorrect statement is the first one. **Final Answer**: The incorrect statement about ozone is **i**.
Promotional Banner

Similar Questions

Explore conceptually related problems

How many of the following statements are correct ? 1. Good ozone is found in the stratosphere. 2. UV radiation having a lower wavelength than UV -B is almost completely absorbed by the Earth's atmosphere. 3. UV - B causes snow blindness and cataract. 4. dB is a unit to measure the thickness of ozone.

Which of the following statements about conducting system of the heart is INCORRECT ? I. Mass of nodal tissue seen in the lower-left corner of the right atrium is the sinoatrial node. II. The nodal musculature can generate action potentials only in response to external stimuli . III. The number of action potential that could be generated in a minute varies at different parts of the nodal system . IV. The SAN can generate the maximum number of action potential , i.e., 80-85 min^(-1)

Which of the following statements about the molecular arrangement of actin and mysin In myofibre is/are incorrect ? (i) Each actin (thin filament) is made of 2F (filamentous) actins. (ii) F-actin is the polymer of G (globular) actin. (iii) 2F0actins are twisted into a helix. (iv) Two strands of tropomyosin (protein) lie in the grooves of F-actin. (v) Troponin molecules (complex proteins) are distributed at regular intervals on the tropomyosin. (vi) Troponin forms the head of the myosin molecule. (vii) The myosin is a polymerised protein.

Stratosphere contains a stable layer of ozone molecules which absorbs UV radiation from the sun. The presence of ozone in atmosphere serves, as a shield to protect living organism on earth from the harmful effects of the solar ultraviolet radiation. The ultraviolet radiation are known to cause skin cancer. Ozone is formed in stratosphere by the following photochemical reactions. O_(2)(g)overset(UV)rarrO(g)+O(g) O(g)+O_(2)(g)overset(UV)hArrO_(3)(g) Ozone is thormodhynamically unstable and ecomposes to molecular oxygen. Thus a dynamic equilibrium exits between the production and decomposition of ozone molecules. The air pollutant which are responsible to deplete the ozone layer is

Stratosphere contains a stable layer of ozone molecules which absorbs UV radiation from the sun. The presence of ozone in atmosphere serves, as a shield to protect living organism on earth from the harmful effects of the solar ultraviolet radiation. The ultraviolet radiation are known to cause skin cancer. Ozone is formed in stratosphere by the following photochemical reactions. O_(2)(g)overset(UV)rarrO(g)+O(g) O(g)+O_(2)(g)overset(UV)hArrO_(3)(g) Ozone is thormodhynamically unstable and ecomposes to molecular oxygen. Thus a dynamic equilibrium exits between the production and decomposition of ozone molecules. Maximum quantity of ozone is present in

Stratosphere contains a stable layer of ozone molecules which absorbs UV radiation from the sun. The presence of ozone in atmosphere serves, as a shield to protect living organism on earth from the harmful effects of the solar ultraviolet radiation. The ultraviolet radiation are known to cause skin cancer. Ozone is formed in stratosphere by the following photochemical reactions. O_(2)(g)overset(UV)rarrO(g)+O(g) O(g)+O_(2)(g)overset(UV)hArrO_(3)(g) Ozone is thormodhynamically unstable and ecomposes to molecular oxygen. Thus a dynamic equilibrium exits between the production and decomposition of ozone molecules. Earth is protected from UV radiation by

Read the following statements carefully and select the incorrect ones. (i) Development of the fertile top-soil takes centuries, but it can be easily removed due to human activites such as over-cultivation, unrestricted grazing, etc. (ii) Waterlogging results in soil salinity. (iii) UV rays are responsible for degradation of ozone shield in atmosphere. (iv) Ozone present in troposphere acts as a shield abosrbing UV radiations coming from the Sun. (v) Global warming can be controlled by increasing the use of fossil fuels.

Consider the following statements : (i) Zirconium - alizarins due is used for testing fluoride ions is water (ii) Ozone layer is present in mesosphere (iii) the poisonous gas present in the exhaust fumes of automobiles is Co (iv) Taj Mahal is affected by CO_(2) gas The correct statement are

Which of the following statements is INCORRECT? I. Human kidneys can produce urine nearly six times more concentrated than the initial filtrate formed. II. An increase in body fluid volume can switch on the osmoreceptors and stimulate ADH. III. Substance like glucose, amino acids, Na^+ , etc., in the filtrate, are reabsorbed actively by the renal tubule whereas the nitrogenous wastes are absorbed by passive transport IV. Each kidney has nearly one million complex tubular structures called nephrons which are the functional units.

Given below is a representation of a type of pollution. Study the picture and answer the questions : (i) Name the type of pollution shown in the picture. (ii) Name one source of this pollution. (iii) How does this pollution affect human health ? (iv) Write one measure to reduce this pollution. (v) State one gaseous compound that leads to the depletion of the ozone layer and creates'Ozone holes'.