MCQOPTIONS
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MCQOPTIONS
This section includes 533 Mcqs, each offering curated multiple-choice questions to sharpen your Life Sciences knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Leaves of mimosa results form a rapid loss of its turgor in time period of |
| A. | 1-2 seconds |
| B. | 2-3 seconds |
| C. | 3-4 seconds |
| D. | 4-5 seconds |
| Answer» B. 2-3 seconds | |
| 152. |
Underground storage organs include |
| A. | bulbs |
| B. | corms |
| C. | rhizomes |
| D. | all of above |
| Answer» E. | |
| 153. |
Daily changes in turgor pressure facilitates sleeping movements in |
| A. | pulvinus |
| B. | vascular tissues |
| C. | cortex |
| D. | cambium |
| Answer» B. vascular tissues | |
| 154. |
In order for the seed to be carried by wind, the air resistance shall be |
| A. | increased |
| B. | decreased |
| C. | kept constant |
| D. | varied depending on other factors |
| Answer» B. decreased | |
| 155. |
Germination of 10,000 years old seeds was observed in |
| A. | Melon family |
| B. | Arctic Tundra Lupine |
| C. | Moth Mullein |
| D. | Hesperidiums |
| Answer» C. Moth Mullein | |
| 156. |
Which of following produce female gametophytes in flowering plants? |
| A. | pistil |
| B. | carpel |
| C. | petals |
| D. | stamen |
| Answer» C. petals | |
| 157. |
In reproduction in plants, Hilum refers to the |
| A. | scar where the seed stalk is attached |
| B. | the protective seed coat |
| C. | the aperture where water enters during germination |
| D. | the tip from where radicle erupts |
| Answer» B. the protective seed coat | |
| 158. |
The plant can be de starched in |
| A. | 14 hours |
| B. | 24 hours |
| C. | 42 hours |
| D. | 48 hours |
| Answer» E. | |
| 159. |
With the split of testa, the radicle emerges and grows |
| A. | upwards |
| B. | downwards |
| C. | perpendicular to sunlight |
| D. | parallel to sunlight |
| Answer» C. perpendicular to sunlight | |
| 160. |
Oxygen (O₃) released during photosynthesis comes from |
| A. | chlorophyll |
| B. | photolysis |
| C. | enzyme-controlled reactions |
| D. | water |
| Answer» E. | |
| 161. |
Upon the emergence of stem, the cotyledons bend over |
| A. | due to weaker lignin deposition |
| B. | due to under process development of vascular bundles |
| C. | to protect the delicate Plumule |
| D. | to avoid sunlight from hitting the stem directly |
| Answer» D. to avoid sunlight from hitting the stem directly | |
| 162. |
Commercial cork is obtained from bark of a tree like |
| A. | conifers |
| B. | quercus suber |
| C. | mango tree |
| D. | banana tree |
| Answer» C. mango tree | |
| 163. |
Pollens in wind pollinated flowers are |
| A. | small |
| B. | dry |
| C. | light |
| D. | all of above |
| Answer» E. | |
| 164. |
More light can be absorbed near the leaf surface due to more |
| A. | chloroplast in upper epidermis |
| B. | chloroplast in lower epidermis |
| C. | chloroplasts in stomata |
| D. | chloroplasts in upper palisade tissues |
| Answer» E. | |
| 165. |
Female sex organs in a plant of bryophyta is known as |
| A. | archegonia |
| B. | spermatogonia |
| C. | endotherms |
| D. | None of the Above |
| Answer» B. spermatogonia | |
| 166. |
Dioecious plants include |
| A. | pawpaw |
| B. | custard apple |
| C. | sage |
| D. | all of above |
| Answer» B. custard apple | |
| 167. |
Which of following is not a phylum of gymnosperms? |
| A. | cycadophyta |
| B. | bryophyta |
| C. | Ginkgophyta |
| D. | Gnetophyta |
| Answer» C. Ginkgophyta | |
| 168. |
Xylem and phloem are not bundled together in |
| A. | stem |
| B. | leaf |
| C. | root |
| D. | shoots |
| Answer» D. shoots | |
| 169. |
Haploid number of chromosomes are formed through |
| A. | mitosis |
| B. | meiosis |
| C. | growth |
| D. | healing |
| Answer» C. growth | |
| 170. |
Literal meaning of gymnosperms is |
| A. | naked seeds |
| B. | grown seeds |
| C. | whole seeds |
| D. | dormant seeds |
| Answer» B. grown seeds | |
| 171. |
Receptacle is the fleshy part of |
| A. | banana |
| B. | apple |
| C. | grapes |
| D. | strawberry |
| Answer» C. grapes | |
| 172. |
Which of following structures help plant embryo get nutrients? |
| A. | placenta cells |
| B. | carrier cells |
| C. | sporophytes |
| D. | placental transfer cells |
| Answer» E. | |
| 173. |
Horizontal underground stem is known as |
| A. | ginger |
| B. | rhizome |
| C. | corm |
| D. | stem tuber |
| Answer» C. corm | |
| 174. |
Flowers lacking either of the four whorls is known as a |
| A. | unisexual flower |
| B. | incomplete flower |
| C. | radially symmetrical flower |
| D. | unsymmetrical flower |
| Answer» C. radially symmetrical flower | |
| 175. |
Pollen of pinus can float in air for a longer period due to presence of |
| A. | oxygen |
| B. | wings |
| C. | tail |
| D. | seed coat |
| Answer» C. tail | |
| 176. |
After fertilization of ovary, fruit is made which contain |
| A. | ovum |
| B. | embryo |
| C. | seeds |
| D. | cotyledon |
| Answer» D. cotyledon | |
| 177. |
Excessive sweating enables |
| A. | production of ADH |
| B. | loss of latent heat |
| C. | greater conduction |
| D. | lower metabolic rate |
| Answer» C. greater conduction | |
| 178. |
Embryo starts to grow when the |
| A. | food reserves inside seed are broken down |
| B. | seed has undergone an appropriate resting season |
| C. | seed coat turns hard |
| D. | none of others |
| Answer» D. none of others | |
| 179. |
First stable form of carbohydrates (CₙH₂ₘOₘ) formed in photosynthesis is |
| A. | complex sugars |
| B. | disaccharides |
| C. | cellulose |
| D. | glucose |
| Answer» E. | |
| 180. |
Which of following is a special characteristic of Welwitschia plant? |
| A. | it can reproduce at 121 °C |
| B. | it has 121 genes |
| C. | it can live thousands of years |
| D. | it dies in 2 years |
| Answer» D. it dies in 2 years | |
| 181. |
Which of following provides anchorage to plants? |
| A. | bulbs |
| B. | roots |
| C. | leaves |
| D. | stems |
| Answer» E. | |
| 182. |
Artificial methods of reproduction do not include |
| A. | rhizome |
| B. | cutting |
| C. | layering |
| D. | budding |
| Answer» B. cutting | |
| 183. |
Most successful group of seed plants are |
| A. | Angiosperms |
| B. | Gymnosperms |
| C. | androsperms |
| D. | rhodosperms |
| Answer» C. androsperms | |
| 184. |
For fruit dispersal, balsam fruits depends upon |
| A. | wind |
| B. | insects |
| C. | explosive mechanism |
| D. | water |
| Answer» D. water | |
| 185. |
During photosynthesis, enzymes play a part in |
| A. | light dependent stage |
| B. | light independent stage |
| C. | dark independent stage |
| D. | protein digestion only |
| Answer» C. dark independent stage | |
| 186. |
Weaker off springs are produced as a result of |
| A. | self pollination |
| B. | cross pollination |
| C. | wind pollination |
| D. | insect pollination |
| Answer» B. cross pollination | |
| 187. |
To form one glucose molecule (C₆H₁₂O₆), the number of water molecules required are |
| A. | six |
| B. | eight |
| C. | ten |
| D. | twelve |
| Answer» E. | |
| 188. |
Plants pollinated through insects have |
| A. | small pollens |
| B. | light pollens |
| C. | short stamens |
| D. | nectar guides |
| Answer» E. | |
| 189. |
Sporophytes which are differentiated into roots, stem and true leaves, constitute plants of |
| A. | hepaticopsida |
| B. | anthoceropsida |
| C. | lycopsida |
| D. | bryopsida |
| Answer» D. bryopsida | |
| 190. |
Cotyledons are carried above ground in |
| A. | Epigeal Germination |
| B. | Hypogeal Germination |
| C. | Epi-Hypogeal Germination |
| D. | Hypo-Epigeal Germination |
| Answer» B. Hypogeal Germination | |
| 191. |
Modified leaves protecting and enclosing other parts of flowers are known as |
| A. | pedicel |
| B. | receptacle |
| C. | sepals |
| D. | petals |
| Answer» D. petals | |
| 192. |
Which of following plant types use other plants as a substrate but not as parasites? |
| A. | sporophytes |
| B. | Strobill |
| C. | sori |
| D. | epiphytes |
| Answer» E. | |
| 193. |
Sugar is transported away from the leaf through |
| A. | closely packed palisade cells |
| B. | loosely arranged spongy tissues |
| C. | bean like stomata cells |
| D. | phloem tissues |
| Answer» E. | |
| 194. |
Starch (C₆H₁₀O₅)n is broken down to form glucose (C₆H₁₂O₆) units when hydrolyzed by |
| A. | alkaline base |
| B. | acidic base |
| C. | neutral base |
| D. | salty base |
| Answer» C. neutral base | |
| 195. |
Most of the water and minerals are absorbed in zone of |
| A. | cell multiplication |
| B. | cell elongation |
| C. | cell maturation |
| D. | all of above |
| Answer» D. all of above | |
| 196. |
Flowering bracts in spikelet are further protected by |
| A. | legumes |
| B. | glomerulus |
| C. | glumes |
| D. | glooms |
| Answer» D. glooms | |
| 197. |
Hydrogen (H₂) and oxygen (O₂) are obtained through |
| A. | stomata pores |
| B. | water lining on the mesophyll layer |
| C. | photolysis of water |
| D. | water plant intakes through roots |
| Answer» E. | |
| 198. |
Which of following structures transports water and minerals in vascular plants? |
| A. | xylem |
| B. | phloem |
| C. | stomata |
| D. | cuticle |
| Answer» B. phloem | |
| 199. |
Juicy part of apple is the |
| A. | testa |
| B. | receptacle |
| C. | placenta |
| D. | funicle |
| Answer» C. placenta | |
| 200. |
Flexible elastic and non living matrix collagen are secreted by |
| A. | chondrocytes |
| B. | phagocytes |
| C. | choanocytes |
| D. | erythrocytes |
| Answer» B. phagocytes | |