Q13 of 31 Page 1

(a) Name the different gases contained in the flask used as an experimental setup by S.L. Miller.

(b) On the basis of composition of gases in this experiment, what was the condition in the flask?


(c) Write the conclusion drawn from this experiment.

(a) The gases are Methane (CH4), Ammonia (NH3), water vapours (H2O) and hydrogen (H2).


(b) The condition of the flask was anaerobic or anoxygenic.


(c) Life originated from pro-existing non-living organic molecules and that formation of life was preceded by chemical evolution.


More from this chapter

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11

Draw the diagram of microsporangium of an angiosperm and label any four parts. State the function of its innermost wall layer.

 12

Give reason:

(a) A liverwort plant is unable to complete its life cycle in a dry environment.


(b) Number of male gametes produced is much more than the female gametes produced.


(c) Organisms exhibiting external fertilization show great synchrony between the sexes and release a large number of gametes into surrounding medium.

 14

When a snapdragon plant bearing pink colour flower was selfed, it was found that, 69 plants were having red coloured flowers. What would be the number of plants bearing pink flower and white flower? Show with the help of Punnett square. Identity the principle of inheritance involved in this experiment.

 15

Refer to the figure given below and answer the questions that follow:


(a) Explain the process by which Tasmanian wolf evolved.


(b) Name the process that has resulted in evolution of wolf and Tasmanian wolf.


(c) Compare and contrast the two animals shown?