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151.

Which of the following is an example of short day plant?A. TobaccoB. SugarbeetC. WheatD. Radish

Answer» Correct Answer - A
152.

In vascular plants ,light promotesA. GrowthB. DevelopmentC. DifferentionD. De-differentiation

Answer» Correct Answer - c
153.

Which of the following is not a growth-measuring instrument?A. AuxanometerB. CrescographC. Horizontal microscopeD. Clinostat

Answer» Correct Answer - 3
154.

Which one is the correct graph for arithmetic growth?A. B. C. D.

Answer» Correct Answer - A
155.

Bending of stem towards light isA. Photoperiodism B. Heliotropism C. Photonasty D. Hydrotropism

Answer» Correct Answer - B
Bending of stem towards light is heliotropism
156.

Growth at a cellular level is principallly a consequence of increase in the amount of (A)_____

Answer» Correct Answer - A-protoplasm
157.

Photoperiodism is associated with the formation ofA. Auxin B. Chlorophyll C. Florigen D. Gibberellin

Answer» Correct Answer - C
Photoperiodism is associated with floriegen.
158.

Growth at cellular level, is principally a consequence of increase in the amount ofA. protoplasmB. DNAC. cell wallD. cell organelles

Answer» Correct Answer - A
159.

The type of growth of bands in conifers isA. LateralB. DelinquentC. CaudexD. Excurrent

Answer» Correct Answer - a
160.

Evergreen trees remain green throughout the year on account ofA. Absence of leaf fallB. Leaves failing in small numbers through at intervalsC. Supply of the moisture thoughout the yearD. Cold climate

Answer» Correct Answer - b
161.

Growth is maximum in zone ofA. cell elongationB. cell divisionC. cell maturationD. all of these

Answer» Correct Answer - A
162.

Fastest phase of S-shaped growth curve isA. lag phaseB. log phaseC. stationary phaseD. both (a) and (b)

Answer» Correct Answer - B
163.

Movement of plant part in response to touch isA. Seismonasty B. Thigmonasty C. Nutation D. None of the above

Answer» Correct Answer - B
Movement of plant part in response to touch is thig-moxa pudica ar seismonasty
164.

Real growth isA. protoplasmic growthB. Cell wall growthC. Growth in sizeD. Growth in volume

Answer» Correct Answer - A
165.

Growth is maximum in the zone ofA. Cell divisionB. Cell elongationC. Cell maturationD. All of these

Answer» Correct Answer - b
166.

The growth in plants isA. LimitedB. UnlimitedC. UnlocalisedD. None the these

Answer» Correct Answer - b
167.

Growth in plant organs isA. Qualitative and extrinsicB. Quantitative and intrinsicC. Qualitative and intrinsicD. Quantitative and extrinsic

Answer» Correct Answer - B
168.

The movement of plant organs in response to force of gravity is calledA. Phototropism B. Phototaxis C. Photolysis D. Photonasty

Answer» Correct Answer - C
Plant movement in response to diffuse stimulus of light is phototaxis.
169.

Seeds of parasitic plants like orobanche germinate in the presence ofA. Auxin produced by the roots of the hostB. `GA_(3)` produced by the roots of the parasiteC. Exudates of the host plantD. Exudates of the parasite

Answer» Correct Answer - c
170.

Which of the following is the primary motive force responsible fopr growthA. Root pressureB. Tugor pressureC. Osmotic pressureD. DPD

Answer» Correct Answer - b
171.

Given below is a graph on the parametes of growth versus time A,B , C respectively represent A. Exponential phase ,log phase and steasdy state phaseB. Steady state phase ,log phase and log phaseC. Slow growing phase , log phase and steady atate state phaseD. Lag phase , steady state phase and logarithmic phase

Answer» Correct Answer - b
172.

The simplest expression of arithmetic of arithmetic growth is exemplfied buyA. Living organism growing in a natural enviornmentB. Typically all cells, tissuses and organs of a plantC. Root enlongation at a constant rateD. Both A and B

Answer» Correct Answer - C
The simplest expression of arithmetic growth is ex-emplified by root elongation at a constant rate.
173.

Which of the following is necessary for growthA. WaterB. OxygenC. NutrientsD. All of the above

Answer» Correct Answer - D
Water, oxygen and nutrients are the necessary for growth
174.

Size of grapes increases in application ofA. gibberellinsB. cytokininC. auxinD. all the above

Answer» Correct Answer - A
175.

What do you mean by stationary phase?

Answer» The growth slows down and finally stops.
176.

Auxon was first isolated from human urine.

Answer» Correct Answer - 1
177.

The nature of all gibberellins isA. alkalineB. neutralC. acidicD. buffer

Answer» Correct Answer - C
178.

Dwarfness can be controlled by treating the plant withA. cytokininB. gibberellic acidC. auxinD. antigibberellin

Answer» Correct Answer - B
179.

Highest growth is found inA. Static phaseB. Exponential phhaseC. Descending phaseD. lag phase

Answer» Correct Answer - b
(b) Log phase is the rapid growing phase of plants between lag and stationary phase.
180.

Distribution of growth in a root by making it at equal intervals with indian inkwas originally studied byA. WellensickB. StrasburgerC. WentD. Nitsch

Answer» Correct Answer - b
(b) Measurement of growth in young root by marking it at 1mm intervals with Indian ink was first done by Strasburger.
181.

In a plant the concentration of gibberellins is highest inA. seeds and young leavesB. apical budsC. old leaves and flower budsD. all the above

Answer» Correct Answer - A
182.

Growth plotted against time gives aA. Parabolic curveB. Sigmoid curveC. Upright lineD. Horizontal line

Answer» Correct Answer - B
Growth plotted against time gives a sigmoid curve
183.

Kinetin is chemically A.  lndole-3-acetic acid B. Terpenes C. `N^(6)` furfurylamino purine D. Carotenoid

Answer» Correct Answer - C
Kinetin is `N^(6)`-furfurylamino purine
184.

Assertion : Gibberellins cause fruits like apple to elongate and improve its shape. Reason : `GA_(3)` is used to speed up the malting process in brewing industry.A. If both assertion and reason are true and reason is the correct explanation of assertionB. If both assertion and reason are true but reason is not the correct explanation of assertionC. If assertion is true but reason is falseD. If both assertion and reason are false

Answer» Correct Answer - b
Application of gibberellins the number and size of several fruits e.g. grape, tomato. Size and shape of apple fruits is enhanced by application of `GA_(4)` and `GA_(7)` mixture. Gibberellins (e.g., `GA_(3))` increase the yield of malt from barley grains i.g., malting.
185.

The gibberellins aare plant growith hormones .They cause elongation of stems .Gibbereellins was first isolated by japanese workers fromA. End osperm of barleyB. Aporophyte of mossC. Aparasitic fungusD. Scutllum of rise

Answer» Correct Answer - c
(c ) Gibberela fujkuroi is the ascomycetous fungus, Which is parasitic in nature.
186.

Why do gibberellins not enhance the growth of isolated plant parts ?

Answer» Gibberellins require the presence of meristematic cells to cause elongation growth. Therefore, they do not enhance growth of isolated plant parts if meristematic cells are absent.
187.

The instrument by which the rate of growth of stem is accurately measured is Or Growith in langth of a plant can be measured byA. HydrometerB. AuxanmeterC. OsmometerD. Potometer

Answer» Correct Answer - b
( b) Auxanometer can register total growth, rate of growth at specific time and overall pattern of growth. In arc auxometer actual growth in length of a plant is measured as
Actual growth=`(" distance travelled by pointer"xx" radius of pulley")/("Length of pointer from centre of pulley")`
188.

Hormone responsible for ageing isA. GAB. I A AC. ABAD. cytokinin

Answer» Correct Answer - C
ABA is a plant growth inhibitor. It promotes senescence and ageing in plant parts.
189.

Growth substance that stimulates nodule formation in leguminous plants is A. NAA B. IAA C. IBA D. ABA

Answer» Correct Answer - B
Growth substance that stimulates nodule formation in leguminous is IAA.
190.

What is the full form of NAA ?

Answer» Naphthaleneacetic acid
191.

Which one of the following is a natural growth inhibitor ?A. NAAB. ABAC. GAD. Auxin

Answer» Correct Answer - B
192.

Maryland mammoth tabacco is a short day plant. Its critical duration of darkness is 10 hours. Under which of the following conditons will it not flower? A. B. C. D.

Answer» Correct Answer - A
A short day plant is the one that flowers on photoperiods shorter than tha critical day length. As the crictical duration of darkness in the Maryland mammoth tobacco is 10 hours to flower. Thus under the conditions shws in option (a), the plant will not flower.
193.

Which one is derivative of a carotenoidA. IAA B. ABA C. IBA D. GA

Answer» Correct Answer - B
ABA is derivative of a carotenoid.
194.

Cytokinis are mostlyA. glucosidesB. phenolicsC. amino purinesD. organic acids

Answer» Correct Answer - C
Cytokinins are plant growth hormones which are basic in nature, cytokinsis (=cell division) either alone or in conjunction with auxin. Kinetin, a synthetic cytokinin, is 6-furfuryl amino purine. Zeatin, a natural cytokinin, is 6-hydroxy 3-methyl trans 2-butenyl amino purine.
195.

Assertion: Vernalization is a treatment to plant given artifically. Reason : Vernalization is perceived by whole plant.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion.B. If both the assertion and reason are true but the reason is not a correct explanation of the assertionC. If the assertion is true but the reason is falseD. If the assertion and reason is false but reason is true

Answer» Correct Answer - B
(b) Many plant do not came to flower before they experience a low temperature. These plants remain vegetative during the warm season, receive low temperature during winter, grow further and then bear flower and fruits. Vernalization is, therefore, a process of shortening of the jurnalization is, therefore, a process of shortening of the juvenile or vegetative phase and hastening flowering by a previous cold treatment. The stimulus cells, e.g.,shoot tip, embroyo tips, root apex, developing leaves etc.
196.

Vernalization stimulates flowering inA. Ginger B. Tunneric C. Zaminkand D. Carrot

Answer» Correct Answer - D
Vemalisation stimulates flowering in carrot
197.

Would you expect soyabean plants to flower if given a daily light exposure of 15 hours ? Give reasons.

Answer» Soyabean is a short day plant which requires long and uninterrupted dark period. It will not flower if given 15 hours daily expsure of light.
198.

What do you understand by apical dominance ?

Answer» It is a phenomenon by which presence of apical bud does not allow the nearby lateral bud to grow out. If the apical bud is removed, the next axial bud begins to grow out.
199.

List any four uses of auxins.

Answer» (i) Auxins are used to prevent premature fruit drop when applied close to the time of harvest. (ii) Auxins induce intiation of roots in stem cutting. (iii) Auxins induce development of parthenocarpic fruits. (iv) Many auxins (2, 4D) are used as potent herbicides.
200.

IAA was first isolated fromA. Corn germ oilB. GibberellaC. Human urineD. Rhizopus

Answer» Correct Answer - C