5. Which one of the following natural sources contains Oxalic acid? 1 (A) Tomato
(B) Tamarind
(C) Ant sting
(D) Nettle sting
OR
The acid produced in our stomach during digestion of food is 1
(A) Hydrochloric acid
(B) Oxalic acid
(C) Lactic acid
(D) Acetic acid
6. Copper utensils slowly lose their shiny brown surface and gain a green coat on prolonged exposure to atmospheric air. This is due to the formation of a coating of 1
(A) Copper sulphate
(B) Copper carbonate
(C) Cupric oxide
(D) Cuprous oxide
7. Which one of the following statements is true about the position of metals in the activity series of metals? 1
(A) Copper is below hydrogen but above lead.
(B) Iron is below lead and zinc.
(C) Zinc is below magnesium but above aluminum.
(D) Magnesium is below calcium but above aluminium.
8. CH4 + Cl2  Sunlight CH3Cl + HCl the above reaction is an example of 1
(A) Displacement reaction
(B) Addition reaction
(C) Substitution reaction
(D) Double displacement reaction
9. The stamen contains 1
(A) stigma
(B) Pollen grain
(C) Sepal
(D) Ovule
OR
Seeds are called products of sexual reproduction because they 1
(A) Give rise to new plants.
(B) Are formed by fusion of gametes.
(C) Are formed by the fusion of pollen tubes.
(D) Can survive for a longer period.
10. Consider the following ecosystems: 1
I. Ponds II. Forests III. Aquariums IV. Crop fields Out of these, the natural ecosystems are
(A) I, II and III
(B) II, III and IV
(C) I and II only
(D) I, II and IV
OR
What will happen if the deer are missing in the following food chain? 1
Grass  Deer  Tiger
(A) The population of tigers will increase.
(B) The amount of grass will decrease.
(C) The tigers will die.
(D) The tigers will start eating grass.
11. Which of the following are the aims of watershed management? 1
I. Soil and water conservation
II. Decrease the biomass production
III. Mitigation of droughts and floods IV. Increase the life of the downstream dams and reservoirs
(A) II and III only
(B) I, III and IV
(C) III and IV only
(D) I, II and IV
12. If vast tracts of forests are cleared and a single species of plant is
Cultivated, then this practice will promote 1
(A) Biodiversity in the area.
(B) Monoculture in the area.
(C) Soil fertility.
(D) Preservation of the natural ecosystem
13. Assertion (A): Plant hormones are chemicals produced in plants which
Help to coordinate growth, development and response to
Stimulus and environment.
Reason (R): Abscisic acid is a plant hormone that promotes cell division. 1
14. Assertion (A): Amoeba always produces two daughter amoebae while
Plasmodium divides into many daughter cells.
Reason (R): Amoeba undergoes binary fission while Plasmodium
Undergoes multiple fission.