Plant Physiology MCQ

Q151. Movements of leaves of the sensitive plant mimosa pundica are due to-

1. AThermonasty
2. BSeismonasty
3. CPhotonasty
4. DNyctinasty

Q152. If the stem grows towards sunlight, and root grow just opposite to it, stem movement is called-

1. ANegative phototrophic movement
2. BPhototrophic movement
3. CPositive phototrophic movement
4. DNone of these

Q153. Example of positive geotropism is-

1. AClosing of flower
2. BUpward growth of stem
3. CDownward growth of root
4. DLateral growth of root

Q154. Thigmotropism is best exhibited by-

1. ALamina
2. BTendrils
3. CRoot apex
4. DThorn

Q155. Leaf of mimosa groops down on touching because of-

1. AWater loss from leaflet base
2. BChange in water concentration
3. CLoss of water from cell to intercellular space in pulvins and pulvinules
4. DAll of these

Q156. Photoperiodism affects-

1. AFlowering
2. BFruiting
3. CVegetative growth
4. DAll of these

Q157. The leaves of mimosa pundica droop down on touch because-

1. APlant have nervous system
2. BThe leaf are very tender
3. CThe leaf tissue are injured
4. DThe turgor pressure of leaf base changed

Q158. Which of the following statement is/are correct regarding vegetative propagation of plants ?n1. Vegetative propagation produces clonal population.n2. Vegetative propagation helps in eliminating the virus.n3. Vegetative propagation can be practiced most of the year.nSelect the correct answer using the code given below :

1. A1 only
2. B2 and 3 only
3. C1 and 3
4. D1, 2 and 3

Q159. What is the type of movement that occurs during opening and closing of flower ?

1. ANastic movement
2. BTactic movement
3. CTropic movement
4. DMutation

Q160. Example of positive geotropism is-

1. AClosing of flower
2. BUpward growth of stem
3. CDownward growth of root
4. DLateral growth of root

Q161. Closure of lid pitcher plant is a-

1. ATropic movement
2. BTurgor movement
3. CParatonic movement
4. DAutonomic movement

Q162. Which of the following is not a plant hormone ?

1. AGibberellic
2. BAuxins
3. CCytokinins
4. DThyroxin

Q163. What is the role of Pneumatophores ?

1. AProtect plant from animals
2. BGet oxygen for respiration
3. CSupport plant in standing upright
4. DHelps plant for pollination

Q164. Consider the following plants-n1. Bougainvillea 2. Carnationsn3. Cocoa 4. GrapesnWhich of these plants are propagated by stem cutting ?

1. A1 & 2
2. B2, 3 & 4
3. C1, 3 & 4
4. D1, 2, 3 & 4

Q165. Consider the following statements-n1. Molasses is a by-product of sugar production process.n2. Bagasse obtained in the sugar mills is used as a fuel in the boilers to generate steam for factories.nSugar can only be produced from sugarcane as the raw material.nWhich of these statement are correct ?

1. A1 and 2
2. B2 and 3
3. C1 and 3
4. D1, 2 and 3

Q166. Consider the following statements-n1. Sweet orange plant is propagated by grafting technique.n2. Jasmine plant is propagated by layering technique.nWhich of the statement(s) given above is/are correct ?

1. A1 only
2. B2 only
3. CBoth 1 and 2
4. DNeither 1 nor 2

Q167. Consider the following-n1. Camphor 2. Chicory 3. Vanilla.nWhich of the above is/are plant product ?

Q168. Assertion (A) : Cellulose is used in making shatter proof glass.nReason (R) : Polysaccharides are not soluble in water.nCodes :

1. ABoth a and R is true and R is correct explanation of A
2. BBoth A and R is true, but R is not correct explanationof A
3. CA is True, but R is false
4. DA is false, but R is true

Q169. In plant body, the water and minerals are transported by-

1. ABast
2. BCollenchyma
3. CParenchyma
4. DXylem

Q170. With reference to the movement of molecules of fluid in plant, consider the following statements-n1. Diffusion is the movement of molecules of a substance from the region of their higher concentration to the region of their lower concentration.n2. Osmosis is a process in which the water molecules move through a semipermeable membrane from the region of their lower concentration to the region of their higher concentration.nWhich of the above statements is/are correct ?

1. A1 only
2. B2 only
3. CBoth 1 and 2
4. DNeither 1 nor 2

Q171. Oxygen released during photosynthesis of green plant comes from the breakdown of which of the following ?

1. ACarbon dioxide
2. BFatty acid
3. CCarbohydrate
4. DWater

Q172. Thee phenomenon by which water molecules move from a weaker solution to a stronger solution through a semipermeable-membrane is called-

1. ADiffusion
2. BOsmosis
3. CTranspiration
4. DTranslocation

Q173. The Crescograph, a device for measuring growth in plants, was invented by-

1. AHyder Ali
2. BSatyendra Bose
3. CSubrahmanyan Chandrasekhar
4. DJagadish Chandra Bose

Q174. First herbicide produced in the world is-

1. A2, 4-D
2. B2, 4, 5-T
3. CPendimethalin
4. DSemazine

Q175. Water passes from the soil into the roots by a physical process called-

1. ADiffusion
2. BTranspiration
3. CAbsorption of CO2
4. DOsmosisn(e) None of the above/more than one of above