Lfsc Gr 11 Vrl Prep For Nov Exam 2026 P2 Q1 — Transcript

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1. 0:00uh paper two November exam
2. 0:02uh grade 11. This is question one.
3. 0:06So,
4. 0:08sorry a bit, colleagues.
5. 0:10Uh when we look here, the first slide
6. 0:12here explains the outline of our paper
7. 0:15uh of of our question one. Um
8. 0:18so, here are the correct ways to answer.
9. 0:20I know most of our learners and um
10. 0:23know these correct ways to answer but
11. 0:26but there are some of our learners who
12. 0:28are still answering wrong here
13. 0:31uh in question one. So, 1.1 is our
14. 0:33multiple choice.
15. 0:36Uh on multiple choice, we only have to
16. 0:38write
17. 0:39uh for an example 1.1.2D.
18. 0:42If the answer is D, you just write D.
19. 0:45Uh it's incorrect to write 1.1.2D
20. 0:48or A. So, that's that's incorrect even
21. 0:51if you started with D, which is the
22. 0:52correct one. We don't mark the first one
23. 0:55correct. That is incorrect. And then
24. 0:561.2,
25. 0:58those are our biological terms. And in
26. 1:00our biological terms,
27. 1:02that's where we find our descriptions.
28. 1:05We No, there's no descriptions. Uh we
29. 1:07you only write the biological term um
30. 1:10expected from you there. We'll say 1.2.1
31. 1:13uh species. That's an example. And then
32. 1:151.3,
33. 1:17that that is our matching column. The
34. 1:18matching column,
35. 1:20uh you have to answer as per the
36. 1:22instructions of the matching column. You
37. 1:24write A only, B only, both A and B, or
38. 1:28none if the answer is none.
39. 1:30Uh you don't have to to write um A, B,
40. 1:35or A or B, or A and B. That is uh
41. 1:39incorrect. You answer as per the
42. 1:40instruction always. We started in grade
43. 1:4310
44. 1:44uh showing you how to answer the
45. 1:46multiple choice. Now in grade 11, you
46. 1:47must be up to date on how to answer
47. 1:49this. And 1.4 and 1.5 1.4, 1.5, and 1.6
48. 1:54uh our data type of questions. There are
49. 1:57no descriptions required. There you just
50. 1:59have to label, to give
51. 2:01the labels and all those
52. 2:03like as maybe we see has said.
53. 2:06So,
54. 2:07when we move to our first slide here, on
55. 2:11this slide I'm having terminology
56. 2:14and there are the descriptions. So, this
57. 2:16terminology and descriptions will cover
58. 2:20our 1.1, 1.2, and 1.3. So, learners must
59. 2:25make sure that they know all of these
60. 2:27descriptions.
61. 2:29Know that prokaryotes are organisms
62. 2:31without a nucleus, eukaryotes are
63. 2:33organisms with a true nucleus. So, and
64. 2:36unicellular organisms are those that are
65. 2:38made up of one cells. A cellular or
66. 2:42organism, an example is a virus because
67. 2:45it is not made up of any cell. It is a
68. 2:48cellular because it is it is not made up
69. 2:51of any cell. So, an example there would
70. 2:53be our
71. 2:55a virus. And then
72. 2:57pollination, transfer of pollen grains
73. 3:00from the anther
74. 3:01to the stigma.
75. 3:03So, and then species and population,
76. 3:08like it was discussed in grade 10,
77. 3:10organisms with similar characteristics
78. 3:12they interbreed and produce fertile
79. 3:14offspring. Those are species. The
80. 3:16population
81. 3:17are organisms of the same species living
82. 3:19in the same habitat at the same time.
83. 3:22So, here I should have written time.
84. 3:25Sorry for that. And then biodiversity,
85. 3:27different living organisms on earth. We
86. 3:30have a pathogen,
87. 3:33a disease causing microorganism. An
88. 3:34example can be
89. 3:36bacteria there. And endoderm, mesoderm,
90. 3:40and ectoderm, these are our embryonic
91. 3:43layers. So, you have to know which one
92. 3:45is the inner layer, endoderm, the middle
93. 3:47layer, mesoderm, and the outer layer is
94. 3:50our ectoderm.
95. 3:53And then
96. 3:54when we move on to the
97. 3:56to the third slide, we also continue
98. 3:59with our terminology
99. 4:01because it covers a lot of marks in
100. 4:02section A.
101. 4:04Uh
102. 4:04you have to know the organisms that are
103. 4:07sessile or sedentary. These organisms
104. 4:10are those that are attached to the rocks
105. 4:13or remains attached to to rocks or
106. 4:16substances for their lifetime. And then
107. 4:19the age and the pyramid
108. 4:21a diagram that shows the distribution of
109. 4:23age and gender of a population,
110. 4:26immigration and emigration.
111. 4:29So, you have to know both of them. One
112. 4:32of them will be asked. Movement of
113. 4:34individuals in a habitat, that's in me
114. 4:37and then in me you move out of a
115. 4:39habitat. And then life expectancy, the
116. 4:42average number of years a person is
117. 4:44expected to live. And intraspecific
118. 4:47competition and intraspecific
119. 4:49competition, those are two types of
120. 4:51competition. Inter is different species
121. 4:55competition between different species,
122. 4:56intra between uh species of uh I mean
123. 4:59organisms of the same species. Let's say
124. 5:02uh two cats are fighting or two dogs are
125. 5:05fighting for for food they that is intra
126. 5:08cuz the dogs are of the same species.
127. 5:11And then thallus plants are plants
128. 5:14uh
129. 5:15without true roots and stems. I made a
130. 5:17mistake there. And then asexual
131. 5:19reproduction, the type of reproduction
132. 5:22where gametes are not involved. And then
133. 5:24developed and developing country, please
134. 5:27know the difference between a developed
135. 5:29country. In a developed country, there
136. 5:31is high expanding old age population,
137. 5:35meaning people grow to their uh oldest
138. 5:38age. They can even reach 90s while
139. 5:41healthy cuz they they are adequate uh
140. 5:44health facilities and they are very
141. 5:47literate, but in our country
142. 5:50which is still trying to develop, we
143. 5:52have a low old age population,
144. 5:55inadequate health facilities, and low
145. 5:59literacy. So, that is the difference
146. 6:02between developing and developed
147. 6:04countries.
148. 6:06As we move on,
149. 6:08okay, as we move on,
150. 6:12now we are getting to our data response
151. 6:15questions. The first um
152. 6:18uh question there will be based on the
153. 6:20greenhouse effect.
154. 6:21Here is the effect of the greenhouse
155. 6:23effect. It leads to an to increased
156. 6:26temperatures on Earth. So, if uh you're
157. 6:29asked about what is the the effect of
158. 6:31the greenhouse effect, about what um
159. 6:35uh
160. 6:35what is the greenhouse effect? It uh it
161. 6:37is increased temperatures on Earth. So,
162. 6:42here is the greenhouse uh effect trip uh
163. 6:45diagram there. Here it shows the radiant
164. 6:48energy from the sun
165. 6:50uh
166. 6:51it uh getting to
167. 6:53the Earth's surface, and here are the
168. 6:55greenhouse gases. Those gases will block
169. 6:58that um radiant energy from uh escaping
170. 7:02and moving uh into the atmosphere. So,
171. 7:05the the what are those gases? Learners
172. 7:07must know these gases, uh the greenhouse
173. 7:09gases. The first gas is water vapor,
174. 7:13and then the second one is carbon
175. 7:14dioxide. The third one is methane. The
176. 7:17fourth one is ozone, and the fifth one
177. 7:19is nitrous oxide. So, please know
178. 7:24uh these gases. If you are given some of
179. 7:27the gases and you're asked of other
180. 7:29gases, you'll have to mention some of
181. 7:31these gases. And then here I'm having
182. 7:34the human activities that increase uh
183. 7:37the greenhouse gases. So, I I chose few
184. 7:40of the gases there. Uh we have uh
185. 7:43methane. The spelling is wrong there.
186. 7:45Sorry for that. So, the landfill sites
187. 7:47will release methane
188. 7:49when we call in those uh when you throw
189. 7:52rubbish dumping sites will will release
190. 7:55our methane. And then,
191. 7:57um number two is carbon dioxide. Carbon
192. 7:59dioxide will be released when we burn
193. 8:01fossil fuels and when we cut trees,
194. 8:03deforestation, and also from our
195. 8:06landfill sites. So, carbon dioxide has
196. 8:08more of those uh sources. And then,
197. 8:11number three, we have our water vapor.
198. 8:14So, uh water vapor comes from
199. 8:17transpiration, um lost water lost in the
200. 8:20form of vapor from plants, and also
201. 8:22evaporation from our water bodies. So,
202. 8:26these are the
203. 8:27um
204. 8:29so uh sources of those gases, the human
205. 8:31activities that we do that will increase
206. 8:33the greenhouse gases. Those greenhouse
207. 8:35gases uh I will be there. They will form
208. 8:38a layer in the atmosphere that will
209. 8:40block the uh the radiant energy from
210. 8:42escaping. As a result, it will lead to
211. 8:45increased temperatures on the earth. So,
212. 8:48this is one of our questions there.
213. 8:53And then, as we move on,
214. 8:56Sorry.
215. 9:01As we move on to our uh last slide, this
216. 9:05is uh pollination,
217. 9:08which will be one of our questions
218. 9:10there. So, pollination we said pollen
219. 9:12grain is transferred from
220. 9:14uh our anthers to our
221. 9:18stigma of um
222. 9:20maybe different plants or the plants of
223. 9:22the same species. So, here we are having
224. 9:24a diagram of a wind-pollinated flower.
225. 9:27So, a diagram of a wind-pollinated
226. 9:29flower will look uh something like this.
227. 9:31Here, we have our petals, and we We
228. 9:35having our anther. Look at the anther.
229. 9:37The size of the anther is very large.
230. 9:39The large anther and the petals are very
231. 9:42small. So, they are smaller than those
232. 9:44of
233. 9:46of insect-pollinated flowers. We are
234. 9:48having our filament. Here is our
235. 9:50filament where the anther is attached
236. 9:53and the ovary. Here is our ovary. The
237. 9:56stigma.
238. 9:57Look at the stigma. Here is a stigma. It
239. 10:00looks like a feather, a feathery stigma.
240. 10:04It is long and feathery. So,
241. 10:07here are those adaptations that are
242. 10:09outlined here. Adaptations of
243. 10:11wind-pollinated flowers. Large feathery
244. 10:14stigma. Here is that stigma. Small
245. 10:16petals. Here are are the petals. They
246. 10:19are not as large as those of the
247. 10:22insect-pollinated flowers.
248. 10:24And then, no scent or odor. So, there's
249. 10:27no scent. It does not attract any other
250. 10:30organisms. Those
251. 10:32it is only wind-pollinated. So, it does
252. 10:36not need to have any scent or odor. And
253. 10:39then, it has a long filament.
254. 10:42So, here is our filament. It is very
255. 10:44long. You can see the filament is very
256. 10:46long where the anther is attached. And
257. 10:49then, it has a large anther. Here is our
258. 10:53anther which is very large so that it
259. 10:55can release as much pollen as possible.
260. 10:59And the stigma is also large so that it
261. 11:01can trap as much as much pollen as
262. 11:04possible for pollination. So, here
263. 11:08the labels will will be there. Learners
264. 11:11must know how to label
265. 11:13a wind-pollinated flower. Ensure that
266. 11:16you know all these labels and how is
267. 11:19this
268. 11:21wind-pollinated flower adapted to
269. 11:23perform its function. Here are the
270. 11:25adaptations.
271. 11:27That's all I am having for you today.