Environmental Science and Ecology - Mock Test 5

Question 41

Green house effect refers to

A) cooling of earth B) trapping of UV rays C) production of cereals D) warming of earth

---

No Details

Question 42

Which of the following is the use of lichens in case of pollution

A) They treat the polluted water B) They act as bioindicators of pollution C) They promote pollution D) Lichens are not related with pollution

---

No Details

Question 43

Which one of the following organisms is used as indicator of water quality

A) Chlorella B) Azospirillum C) Escherichia D) Beggiatoa

---

No Details

Question 44

How does carbon monoxide, a poisonous gas emitted by automobiles, prevent transport of oxygen into the body tissues

A) By destroying the haemoglobin B) By forming a stable compound with haemoglobin C) By obstructing the reaction of oxygen with haemoglobin D) By changing oxygen into carbon dioxide

---

No Details

Question 45

Formation of ozone hole is maximum over

A) India B) Europe C) Antarctica D) Africa

---

No Details

Question 46

In coming years, skin related disorders will be more common due to

A) pollutants in air B) use of detergents C) water pollution D) depletion of ozone layer

---

No Details

Question 47

When huge amount of sewage is dumped into a river, its BOD, will

A) increase B) decrease C) sharply decrease D) remain unchanged

---

No Details

Question 48

The Taj mahal is threatened due to the effect of

A) oxygen B) hydrogen C) chlorine D) sulphur dioxide

---

No Details

Question 49

Fish die in water bodies polluted by sewage due to

A) pathogens B) clogging of gills by silt C) reduction in oxygen D) foul smell

---

No Details

Question 50

Drawback of DDT as pesticide is

A) it becomes ineffective after sometime B) it is less effective than others C) it is not easily/rapidly degraded in nature D) its high cost

---

No Details