MCQOPTIONS
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MCQOPTIONS
This section includes 269 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Pyruvic acid is formed at the end of |
| A. | Calvin cycle |
| B. | Glycolysis |
| C. | Kreb cycle |
| D. | Pentose |
| Answer» C. Kreb cycle | |
| 102. |
A cell placed in strong salt solution will shrink because |
| A. | No auxin as in the stem |
| B. | Less auxin as compared to stem |
| C. | More auxin than the one present in the stem |
| D. | Auxin concentration equal to that of stem |
| Answer» C. More auxin than the one present in the stem | |
| 103. |
Leaves are Greenbecause they |
| A. | Absorb green light |
| B. | Do not absorb but reflect green light |
| C. | Utilise green light |
| D. | Absorb and reflect green light |
| Answer» C. Utilise green light | |
| 104. |
In anaerobic respiration |
| A. | Oxygen is absorbed |
| B. | Oxygen is released |
| C. | Carbon dioxide is released |
| D. | Carbon dioxide is absorbed |
| Answer» D. Carbon dioxide is absorbed | |
| 105. |
Mitochondria are store house of |
| A. | Glycogen |
| B. | Glucose |
| C. | ATP |
| D. | Fats |
| Answer» D. Fats | |
| 106. |
Resins placed in water swell up due to |
| A. | Plasmolysis |
| B. | Adsorption |
| C. | Diffusion |
| D. | Endosmosis |
| Answer» E. | |
| 107. |
Water will be absorbed by root hairs when the external medium is |
| A. | Hypotonic |
| B. | Hypertonic |
| C. | isotonic |
| D. | Viscous |
| Answer» B. Hypertonic | |
| 108. |
Which of the following is essential for photosynthesis |
| A. | Carbon dioxide |
| B. | Chlorophyll |
| C. | Sun light |
| D. | All of these |
| Answer» E. | |
| 109. |
Thigmotropism is best exhibited by |
| A. | Lamina |
| B. | Tendrils |
| C. | Root apex |
| D. | Thorn |
| Answer» C. Root apex | |
| 110. |
Absorption of water by root occurs in the region of |
| A. | Root cap |
| B. | Cell elongation |
| C. | Root hairs |
| D. | Cell division |
| Answer» D. Cell division | |
| 111. |
A Cell increases in volume if the external medium is |
| A. | hypotonic |
| B. | Hypertonic |
| C. | Isotonic |
| D. | None of these |
| Answer» B. Hypertonic | |
| 112. |
Seeds swell when it is placed in water due to |
| A. | Diffusion |
| B. | Osmosis |
| C. | Imbibition |
| D. | Plasmolysis |
| Answer» D. Plasmolysis | |
| 113. |
During rainy seasons doors made up of wood sell up due to |
| A. | Diffusion |
| B. | Osmosis |
| C. | Imbibition |
| D. | Plasmolysis |
| Answer» D. Plasmolysis | |
| 114. |
Growth movement in plant due to light is called |
| A. | Geotropism |
| B. | Phototropism |
| C. | Hydrotropism |
| D. | Thigmotropism |
| Answer» C. Hydrotropism | |
| 115. |
Two main function of leaves are |
| A. | Transpiration and Respiration |
| B. | Respiration and digestion |
| C. | Photosynthesis and respiration |
| D. | Photosynthesis and transpiration |
| Answer» E. | |
| 116. |
Maximum transpiration occurs in |
| A. | Algal cells |
| B. | Xerophytic plants |
| C. | Hydrophytic plants |
| D. | Mesophytic plants |
| Answer» E. | |
| 117. |
Hormone helping in cell divison |
| A. | IAA |
| B. | NAA |
| C. | Cytokinin / Zeatin |
| D. | Gibberellin |
| Answer» D. Gibberellin | |
| 118. |
Movement in plant induced by external stimuli is |
| A. | Tactic movement |
| B. | Nastic movement |
| C. | Autonomic movement |
| D. | Paratonic movement |
| Answer» E. | |
| 119. |
Movements of leaves of the sensitive plant Mimosa pundica are due to |
| A. | Thermonnasty |
| B. | Seismonasly |
| C. | Photonasty |
| D. | Nyctynasty |
| Answer» C. Photonasty | |
| 120. |
Parthenocarpy fruit is obtained by sprying phytohormone |
| A. | Zeafin |
| B. | ABA |
| C. | Auxins |
| D. | Kinetin |
| Answer» D. Kinetin | |
| 121. |
In mitochondria ATP synthesis occurs |
| A. | At the oxter membrane |
| B. | All the cristae |
| C. | In the matrix |
| D. | In the intra cristal space |
| Answer» C. In the matrix | |
| 122. |
Incomplete break down of sugar in anaerobic respiration from |
| A. | Fructose and water |
| B. | Glucose and CO |
| C. | Alcohol and CO |
| D. | Water and CO |
| Answer» D. Water and CO | |
| 123. |
In plant energy is produced during the process of |
| A. | Photosynthesis |
| B. | Transpiration |
| C. | Respiration |
| D. | Water absorption |
| Answer» D. Water absorption | |
| 124. |
IAA was first isolated from |
| A. | Corn germ oil |
| B. | Gibberella |
| C. | Human urine |
| D. | Rhizopus |
| Answer» D. Rhizopus | |
| 125. |
Leaf fall can be prevented with the help of |
| A. | Abcisic acid |
| B. | Auxins |
| C. | Florigen |
| D. | Cyfokinins |
| Answer» E. | |
| 126. |
Highest concentration of auxin occurs |
| A. | In growing tips |
| B. | In leaves |
| C. | At the base of plant organs |
| D. | In xylem and phloem |
| Answer» B. In leaves | |
| 127. |
Which one of the following is a weedicides |
| A. | NAA |
| B. | 2, f-D |
| C. | ABA |
| D. | G.A |
| Answer» C. ABA | |
| 128. |
Gibberellin brings about |
| A. | Yellowing of leaves |
| B. | Promotion of rooting |
| C. | Elongation of genetically dwarf plants |
| D. | Dwarfing of genetically tall plants |
| Answer» D. Dwarfing of genetically tall plants | |
| 129. |
In Plant water is transported through |
| A. | Campium |
| B. | Phloem |
| C. | Wylem |
| D. | Epidermis |
| Answer» D. Epidermis | |
| 130. |
Translocation of food occur through |
| A. | Sieve tube / phloen cell |
| B. | Tracheids |
| C. | Xylem vessels |
| D. | Letex duct |
| Answer» B. Tracheids | |
| 131. |
Which of the following tree require highest amount of water for growth |
| A. | Mango |
| B. | Babool |
| C. | Guava |
| D. | Euclyptus |
| Answer» E. | |
| 132. |
Which one of the following gas comes out during photosynthesis? |
| A. | Oxygen |
| B. | Carbon dioxide |
| C. | Hydrogen |
| D. | Chlorine |
| Answer» B. Carbon dioxide | |
| 133. |
The principle pathway of water translocation in angiosperms is |
| A. | Sieve cell |
| B. | Sieve tube elements |
| C. | Xylem vessel system |
| D. | Xylem and phloem |
| Answer» D. Xylem and phloem | |
| 134. |
Different steps in respiration are controlled by |
| A. | Auxins |
| B. | Sugar |
| C. | Enzymes |
| D. | Kinins |
| Answer» D. Kinins | |
| 135. |
Growth in plant occurs |
| A. | Whole life |
| B. | For definite period |
| C. | Growth does hot takes place in plant |
| D. | None of these |
| Answer» B. For definite period | |
| 136. |
Nastic movements differ from tropic movement in being |
| A. | Movement of variation |
| B. | Non directional |
| C. | Directional |
| D. | Stimulated by chemicals |
| Answer» C. Directional | |
| 137. |
An instrument for measuring the rate of transpiration is |
| A. | Porometer |
| B. | Hygroment |
| C. | Potometer |
| D. | Psychrometer |
| Answer» D. Psychrometer | |
| 138. |
When a Potato piece is kept in a highly concentrated salt solution, then |
| A. | Potato cell is plasumlysed |
| B. | Potato cell cell deplasmhysed |
| C. | Potato cells get buxed |
| D. | All of the above may occur |
| Answer» B. Potato cell cell deplasmhysed | |
| 139. |
Consider the following statements1. Molasses is a by-product of sugar production process.2. Bagasse obtained in the sugar mills is used as a fuel in the boilers to generate steam for factories.3. Sugar can only be produced from sugar cane as the raw material.Which of these statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» B. 2 and 3 | |
| 140. |
Which one is semipermeable? |
| A. | Plasmalemma |
| B. | Cell Wall |
| C. | Endoplasmis |
| D. | Golgi body |
| Answer» B. Cell Wall | |
| 141. |
Which one of the following statements is/are correct about harmone |
| A. | It is a organic compound which control the growth of plant |
| B. | It is a special kind of organic compound found in small amount which control metabolic activity and growth of plant |
| C. | It is different concentration have different effect on different organ |
| D. | All of these |
| Answer» E. | |
| 142. |
Root hair absorb water from soil when |
| A. | Osmotic concentration is same in the two |
| B. | Solute concentration is higher in soil solution |
| C. | Solute concentration is higher in root hair |
| D. | Absorpton is active |
| Answer» D. Absorpton is active | |
| 143. |
If the stem grows toward sunlight, and root grow just opposite to it, stem movement is called |
| A. | negative phototrophic movement |
| B. | Phototrophic movement |
| C. | Positive phototrophic movement |
| D. | None of these |
| Answer» D. None of these | |
| 144. |
The leaves of Mimosa pudica droop down on touch because |
| A. | Plant have nervous system |
| B. | The leaf are very tender |
| C. | The leaf tissue are injured |
| D. | The turgor pressure of leaf base changes |
| Answer» E. | |
| 145. |
Fruit ripening is accelerated by |
| A. | Warm surroundings |
| B. | Increased nitrogen supply |
| C. | Reduced water supply |
| D. | Ethylene rich atmosphere |
| Answer» E. | |
| 146. |
First step of photosynthesis is |
| A. | Activation of chlorophyll by sunlight |
| B. | Oxygen comes out from water |
| C. | Formation of carbohydrate |
| D. | Fixation of carbon dioxide |
| Answer» B. Oxygen comes out from water | |
| 147. |
Leaf of Mimosa droops down on touching because of |
| A. | Water loss from leaflet base |
| B. | Change in water concentration |
| C. | Loss of water from cell to intercellular space in paulvinus and pulvinules |
| D. | All of above |
| Answer» D. All of above | |
| 148. |
Food products are kept in cold storage or refrigeration in order to |
| A. | Make them tasty |
| B. | Use in off season |
| C. | maintenance of freshness, longevity and teste due |
| D. | Keep them cool |
| Answer» D. Keep them cool | |
| 149. |
Growth rate of plant when plolted on the paper against time then "S" shaped curve is obtained, it is called |
| A. | Sigmoid curve |
| B. | Respiration curve |
| C. | Excretion curve |
| D. | Osmotic curve |
| Answer» B. Respiration curve | |
| 150. |
A twing kept in water having some salt remain fresh for longer period due to |
| A. | Decrease in bacterial degradation |
| B. | Exosmosis |
| C. | Decrease in transpiration rate |
| D. | Absorption of more water |
| Answer» D. Absorption of more water | |