Choose the incorrect statement from the following:
(a) ozone is a molecule formed by three atoms of oxygen
(b) ozone shields the surface of the earth from ultraviolet radiations
(c) ozone is deadly poisonous.
(d) ozone gets decomposed by UV radiations

Why ozone hole forms over Antarctica? How will enhanced ultraviolet Radiations affect us?

Choose the incorrect statement about cockroaches from the following. (a) Antennae have sensory receptors that help in monitoring the environment. (b) The head is formed by the fusion of six segments and show great mobility in all directions and flexible neck . (c) The first pair of wings arise from the mesothorax and the second pair from the metathorax. (d) In males , the genital pouch or chamber lies at the hind end of abdomen bounded ventrally by 9th and 10th terga and dorsally by the 9th sternum.

Assertion : Ozone in the troposphere is a product of ultraviolet radiations acting on dioxygen molecules. Reason : Ozone is thermodynamically very stable.

Ozone layer protect us from the harmful effects of..........radiations.

Assertion : Ozone layer in the upper region of atmosphere protects earth from UV radiations of sun. Reason : Ozone is a powerful oxidising agent as compared to oxygen.

Choose the incorrect statement from the following : a . 12 pairs of ribs are present . b. Ribs dorsally articulate with sternum and ventrally with the vertebral column . c . Ribs are not bicephalic d. Ribs are attached with sternum with the help of hyaline cartilage.

Select the incorrect statement from the following. (a) Rhizobium multiply and colonises the surroundings of roots and gets attached to epidermal and root hair cell. (b) Successful infection of the root hair causes it to curl . (c) The nodule establishes a direct Vascular connection with the host . (d) Infection thread carries the bacteria to xylem and phloem .

How many are the incorrect statements from the followings: a) In museum insects are preserved in insect boxes after collecting and killing. b) Monkey, gorilla and gibbon are placed in class mammalia. c) In an order similar characters are more as compared to different genera included in a family. d) Three pairs of jointed legs are present in all chordates.

Find the incorrect statement from the following . (a) Tropical rain forests cover around 6 percent of earth's land surface. (b) Animals with migratory habits are badly affected by habitat loss and fragmentation. (c) Mammals and birds require small territories. (d) Amazon rain forest is being cut and cleared for soya bean cultivation or for conversion to grasslands for raising beef cattle

Why ozone hole forms over Antarctia ? How will enhanced UV radiation affect us ?