151. In herbaceous plants, support is mainly given by:
Answer: C. turgidity of cells
Biology Class 11 Unit 9: Diversity in Plant Functions MCQs
278 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 4 of 6.
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152. Mechanical tissues are:
Answer: B. collenchyma and sclerenchyma
153. Collenchyma is:
Answer: B. living with thickened corners, giving support to young plants
154. Collenchyma cells have cell wall thickened with:
Answer: B. cellulose and pectin at corners
155. Sclerenchyma at maturity is:
Answer: B. dead due to heavily lignified secondary walls
156. The two types of sclerenchyma are:
Answer: B. fibres and sclereids
157. Sclereids are common in:
Answer: C. fruit walls and seed coats
158. In dicot stems vascular bundles are arranged:
Answer: B. in a ring
159. Growth is characterized by:
Answer: B. irreversible increase in size and mass
160. Plants show growth throughout life. This is called:
Answer: B. open growth
161. The region of dividing cells in plants is the:
Answer: B. meristem
162. Meristematic cells are generally:
Answer: B. small and cuboidal with large nuclei, small vacuoles and thin walls
163. The two major kinds of meristems are:
Answer: B. apical and lateral
164. Apical meristems are located at:
Answer: C. tips of roots and shoots
165. Apical meristems are also known as:
Answer: B. primary meristems
166. Lateral meristems increase the:
Answer: B. thickness and diameter
167. Lateral meristems are also called:
Answer: B. secondary meristems
168. Vascular cambium and cork cambium are:
Answer: B. lateral meristems
169. Cork cambium is also called:
Answer: B. phellogen
170. Intercalary meristems are located:
Answer: B. at the nodes in grasses
171. The increase in length of root and shoot is:
Answer: B. primary growth
172. The increase in thickness is:
Answer: B. secondary growth
173. Secondary growth is characteristic of:
Answer: B. dicots and gymnosperms
174. Vascular cambium produces secondary xylem towards the:
Answer: B. inner side
175. Vascular cambium produces secondary phloem towards the:
Answer: B. outer side
176. In spring and summer the xylem cells are:
Answer: B. larger in size (early wood)
177. In autumn and winter the xylem cells produced are:
Answer: B. smaller (late wood)
178. Annual rings are formed due to:
Answer: B. differential growth of secondary xylem in different seasons
179. The age of a tree can be determined by counting:
Answer: C. annual rings
180. Cork cambium adds cork towards the outer side and:
Answer: B. secondary cortex inside
181. The wood is mainly:
Answer: B. secondary xylem
182. The dark central region of wood is:
Answer: B. heartwood
183. The functional lighter outer wood is:
Answer: B. sapwood
184. Bark includes all tissues:
Answer: B. outside the vascular cambium
185. Interactions among different growing points are called:
Answer: B. growth correlations
186. The presence of an apical bud inhibiting the growth of lateral buds is:
Answer: B. apical dominance
187. Apical dominance is caused by:
Answer: C. auxin
188. Cytokinin from lateral buds acts ... to auxin in apical dominance:
Answer: B. antagonistically
189. Plants with strong apical dominance are usually:
Answer: B. tall with few branches
190. The plant growth regulators number:
Answer: C. five
191. Growth promoters are:
Answer: B. auxins, gibberellins and cytokinins
192. Growth inhibitors are:
Answer: C. abscisic acid and ethene
193. The first plant hormone ever discovered is:
Answer: B. auxin
194. Auxins are mainly synthesized in:
Answer: C. shoot tips, leaf primordia, young leaves and embryos
195. Auxins mainly promote:
Answer: B. cell elongation
196. Gibberellin GA3 is called:
Answer: B. gibberellic acid
197. Gibberellins are especially abundant in:
Answer: C. seeds and young shoots
198. Gibberellins control:
Answer: B. stem elongation by stimulating cell division and elongation
199. Cytokinins are named for their role in:
Answer: B. cell division (cytokinesis)
200. The most active naturally occurring cytokinin is:
Answer: B. zeatin, isolated from corn
About Biology Class 11 Unit 9 MCQs (Federal Board)
These 278 Biology MCQs cover Class 11 Unit 9: Diversity in Plant Functions of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 6 pages of 50. Use the Print button to save this chapter as a PDF.