[A] Both (i) and (ii) Ozone is present in very low concentration in the lower atmosphere or troposphere. It is present in higher concentrations in the upper atmosphere or stratosphere. It is quite harmful when present in the lower atmosphere as it causes several diseases in humans. It is beneficialRead more
[A] Both (i) and (ii)
Ozone is present in very low concentration in the lower atmosphere or troposphere. It is present in higher concentrations in the upper atmosphere or stratosphere. It is quite harmful when present in the lower atmosphere as it causes several diseases in humans. It is beneficial when present in upper atmosphere as it shields the surface of the earth from the harmful ultraviolet radiations of the sun.
Select the incorrect statements regarding ozone gas:
[A] Both (i) and (ii) Ozone is present in very low concentration in the lower atmosphere or troposphere. It is present in higher concentrations in the upper atmosphere or stratosphere. It is quite harmful when present in the lower atmosphere as it causes several diseases in humans. It is beneficialRead more
[A] Both (i) and (ii)
See lessOzone is present in very low concentration in the lower atmosphere or troposphere. It is present in higher concentrations in the upper atmosphere or stratosphere. It is quite harmful when present in the lower atmosphere as it causes several diseases in humans. It is beneficial when present in upper atmosphere as it shields the surface of the earth from the harmful ultraviolet radiations of the sun.
The reactivity order of metals towards water is:
[B] Na > Ca > Zn > Fe > Al
[B] Na > Ca > Zn > Fe > Al
See lessWhich of these gases is released when metals react with water?
[C] Hydrogen
[C] Hydrogen
See less__________ always produces a diminished image of an object.
[A] A convex mirror A convex produces only virtual and diminished images of objects.
[A] A convex mirror
See lessA convex produces only virtual and diminished images of objects.
Choose the correct statement from the following:
a. Cleistogamous flowers always exhibit autogamy
a. Cleistogamous flowers always exhibit autogamy
See lessFrom the statements given below choose the option that are true for a typical female gametophyte of a flowering plant:
(c) i & ii
(c) i & ii
See lessFrom among the sets of terms given below, identify those that are associated with the gynoecium.
a. Stigma, ovule, embryo sac, placenta
a. Stigma, ovule, embryo sac, placenta
See lessThe outermost and innermost wall layers of microsporangium in an anther are respectively
d. Epidermis and tapetum
d. Epidermis and tapetum
See lessIn a typical complete, bisexual and hypogynous flower the arrangement of floral whorls on the thalamus from the outermost to the innermost is:
a. Calyx, corolla, androecium and gynoecium
a. Calyx, corolla, androecium and gynoecium
See less