BIOGEOCHEMICAL CYCLES
94. How is the biosphere made as a dynamic and stable system?
THE WATER CYCLE
95. How is the rain caused?
96. What is known as the water cycle?
97. What are the sources of human usage of water?
98. How do rivers help the marine organisms?
THE NITROGEN CYCLE
99. Nitrogen gas makes up ------------- of our atmosphere.
100. Nitrogen is a part of many molecules that supply ------------, ----------------- and some ---------.
101. Nitrogen is found in biological compounds like -------------- and -----------------.
102. All these life-forms could use nitrogen directly from the atmosphere. True or False?
103. What are 'nitrogen-fixing' bacteria?
104. Where are they found?
105. What is the result of the convertion of nitrogen during lightning?
106. Plants generally take up nitrates and nitrites and convert them into ----------------- which are used to make ---------------.
107. Describe the nitrogen cycle.
THE CARBON CYCLE
108. What are the forms in which carbon is found on the earth?
109. Carbon molecules contain --------, ---------, ---------------, -------------- and ----------------.
110. The ----------------- and ------------------- of various animals are formed from carbonate salts.
111. How is carbon incorporated into life-forms?
112. How does utilisation of glucose help the living things?
113. How is glucose converted to carbondioxide?
114. Write notes on the process of combustion.
115. How has industrial revolution affected the percentage of carbon dioxide?
THE GREENHOUSE EFFECT
116. Why is temperature inside a glass enclosure much higher than the surroundings?
117. How can tropical plants be kept warm during colder climates?
118. Describe the greenhouse effect.
119. Carbon dioxide is one of the greenhouse gases. True or False?
120. What is global warming? What are its consequences?
THE OXYGEN CYCLE
121. Oxygen is a very abundant element on our earth. True or False?
122. Oxygen is found in the ------------ form in the atmosphere to the extent of ------------ percent.
123. Oxygen exists in the combined form in the ------------------- and in the air in the form of -------------.
124. How is oxygen found in the crust?
125. What are the biological molecules for which oxygen is an essential component?
126. Name the three processes that use up oxygen in the atmosphere.
127. How is oxygen returned to the atmosphere?
128. Describe oxygen cycle.
129. What are poisoned by oxygen?
OZONE LAYER
130. Elemental oxygen is found in the form of a ------------ molecule.
131. In the upper area of the atmosphere a molecule containing ----------- atoms of oxygen is found.
132. What is O3 otherwise called?
133. What is the difference between Oxygen and Ozone?
134. What is the most essential function of Ozone?
135. Why is the ozone layer getting depleted?
136. What are the consequences of the reduction of the ozone layer over earth?
94. How is the biosphere made as a dynamic and stable system?
THE WATER CYCLE
95. How is the rain caused?
96. What is known as the water cycle?
97. What are the sources of human usage of water?
98. How do rivers help the marine organisms?
THE NITROGEN CYCLE
99. Nitrogen gas makes up ------------- of our atmosphere.
100. Nitrogen is a part of many molecules that supply ------------, ----------------- and some ---------.
101. Nitrogen is found in biological compounds like -------------- and -----------------.
102. All these life-forms could use nitrogen directly from the atmosphere. True or False?
103. What are 'nitrogen-fixing' bacteria?
104. Where are they found?
105. What is the result of the convertion of nitrogen during lightning?
106. Plants generally take up nitrates and nitrites and convert them into ----------------- which are used to make ---------------.
107. Describe the nitrogen cycle.
THE CARBON CYCLE
108. What are the forms in which carbon is found on the earth?
109. Carbon molecules contain --------, ---------, ---------------, -------------- and ----------------.
110. The ----------------- and ------------------- of various animals are formed from carbonate salts.
111. How is carbon incorporated into life-forms?
112. How does utilisation of glucose help the living things?
113. How is glucose converted to carbondioxide?
114. Write notes on the process of combustion.
115. How has industrial revolution affected the percentage of carbon dioxide?
THE GREENHOUSE EFFECT
116. Why is temperature inside a glass enclosure much higher than the surroundings?
117. How can tropical plants be kept warm during colder climates?
118. Describe the greenhouse effect.
119. Carbon dioxide is one of the greenhouse gases. True or False?
120. What is global warming? What are its consequences?
THE OXYGEN CYCLE
121. Oxygen is a very abundant element on our earth. True or False?
122. Oxygen is found in the ------------ form in the atmosphere to the extent of ------------ percent.
123. Oxygen exists in the combined form in the ------------------- and in the air in the form of -------------.
124. How is oxygen found in the crust?
125. What are the biological molecules for which oxygen is an essential component?
126. Name the three processes that use up oxygen in the atmosphere.
127. How is oxygen returned to the atmosphere?
128. Describe oxygen cycle.
129. What are poisoned by oxygen?
OZONE LAYER
130. Elemental oxygen is found in the form of a ------------ molecule.
131. In the upper area of the atmosphere a molecule containing ----------- atoms of oxygen is found.
132. What is O3 otherwise called?
133. What is the difference between Oxygen and Ozone?
134. What is the most essential function of Ozone?
135. Why is the ozone layer getting depleted?
136. What are the consequences of the reduction of the ozone layer over earth?
No comments:
Post a Comment