Tuesday, March 26, 2024

15. Plant Growth and Development

1. Who classified the plants into different categories on the basis of photoperiodic responses

(A) benthem and Hooker

(B) cajlachjan

(C) Garner and Allard

(D) Linneus

Answer

Ans.(C)


2. The plant which needs light period shorter than critical period is called

(A) Short day plant(SDP)

(B) Long day plant(LDP)

(C) Day neutral plant(DNP)

(D) Short long day plant(SLDP)

Answer

Ans.(A)


3. Vernalization is also called as

(A) Spiringification

(B) Yarovization

(C) Chilling effect

(D) All of these

Answer

Ans.(D)


4. The harmone which stimulates the flowering in vernalized plant is

(A) Florigen

(B) Vernalin

(C) Cytokinin

(D) Gibberellin

Answer

Ans.(B)


5. Vernalization is

(A) Growth curve related to light

(B) Effect of photoperiods on plant growth

(C) Speeding up ability to flower by low temperature

(D) Diurnal photoperiodicty

Answer

Ans.(C)


6. Epigeal germination is found in

(A) Gram

(B) Pea

(C) Castor

(D) Jowar

Answer

Ans.(C)


7. Which of the following substance acts as natural germination inhibitor?

(A) Cytokinin

(B) Gibberellin

(C) Ethylene

(D) Caumarin

Answer

Ans.(D)


8. The part of seed which emerges out first during germination is

(A) Radicle

(B) Plumule

(C) Root

(D) Shoot

Answer

Ans.(A)


9. Indefinite growth of plants is due to presence of

(A) Meristemtic cells

(B) Parenchyma

(C) Permanent tissue

(D) Vascular tissue

Answer

Ans.(A)


10. In which of the following, rate of growth gradually slows down and comes to steady stage?

(A) Lag phase

(B) Log phase

(C) Exponential phase

(D) Stationary phase

Answer

Ans.(D)


11. Identify the true statement/statements regarding growth and development in organisms.

(A) Growth is intrinsic.

(B) Growth is the physical development while development is the physiological growth.

(C) Growth is accompanied by development.

(D) All of these.

Answer

Ans.(D)


12. Vernalization treatment can convert

(A) a biennial into an annual.

(B) a spring variety into a winter variety.

(C) an annual into a perennial.

(D) all of these .

Answer

Ans.(D)


13. Scarification is a method of overcoming dormancy in seeds which

(A) contain immature embryo.

(B) Hard seed coat.

(C) possess germination inhibiting substance.

(D) contain fully formed but physiologically unripe embryo.

Answer

Ans.(B)


14. Identify the precursor substance used in the biosynthesis of gibberellins in plants.

(A) Gibberellic acid

(B) Methionine

(C) Acetyl Co-A

(D) Tryptophan

Answer

Ans.(C)


15. Seeds in which germination is stimulated by light are called

(A) Photoblastic seeds

(B) Thermoblastic seed

(C) Positively photoblastic

(D) Negatively photoblastic

Answer

Ans.(C)


16. The chemical substances like phenolics, caumarins, ferulic acid are

(A) Growth harmones

(B) Growth inhibitors

(C) Germination inhibitors

(D) Germination promoters

Answer

Ans.(B)


17. The seeds which can not germinate in absence of light is called

(A) Positively photoblastic seed

(B) Negatively photpblastic seed

(C) Photoblastic seed

(D) Photpperiodic seeds

Answer

Ans.(A)


18. Germination inhibitors leached out by one plant may inhibit germination of seeds of other plants is called as

(A) Allopathy

(B) Allelopathy

(C) Dormancy

(D) Aromapathy

Answer

Ans.(B)


19. The dormancy of seed is due to mechanical resistance of seed coat in

(A) Allisma

(B) Capsella

(C) Amaranthus

(D) All the above

Answer

Ans.(D)


20. Which of the following growth harmones in plant is influenced by light?

(A) Gibberellin

(B) Cytokinin

(C) Auxin

(D) Ethylene

Answer

Ans.(C)


21. A seed which is just waiting for favourable environmental condition to germinate is called

(A)Dormant seed

(B)Quiescent seed

(C) Non-viable seed

(D) Dead seed

Answer

Ans.(B)


22. Richmond – Lang effect is

(A) Morphogenesis

(B) Delay of senescence under control of cytokinin

(C) Induction of early flowering

(D) Protection of organs

Answer

Ans.(B)


23. 2,4-D is used as

(A) Florigen

(B) Vernalin

(C) Herbicide

(D) Fungicide

Answer

Ans.(C)


24. The type of germination in which cotyledons come above the ground is called as

(A) Epigeal

(B) Hypogeal

(C) Viviparpus

(D) Oviparous

Answer

Ans.(A)


25. In most of monocot plants, germination is

(A) Epigeal

(B) Hypogeal

(C) Viviparous

(D) Hydrogeal

Answer

Ans.(B)


26.The phase of growth which is the first phase and represents lag phase of growth curve is

(A) Formative phase

(B) Cell enlargement phase

(C) Maturation phase

(D) Stationery phase

Answer

Ans.(A)


27. The lateral meristem in plant is reponsible for

(A) Primary growth

(B) Secondary growth

(C) Exponential growth

(D) Growht in elongation

Answer

Ans.(B)


28. Plant growth can be measured by

(A) Horizontal microscope

(B) Crescograph

(C) Auxanometer

(D) All the above

Answer

Ans.(D)


29.Auxins were first isolated form the plants by

(A) Darwin

(B) F.W.Wend

(C) Boysen-Jensen

(D) Sachs

Answer

Ans.(B)


30. Apical dominance is due to

(A)Abcisic acid

(B) Gibberelic acid

(C) Auxin

(D) Cytokinin

Answer

Ans.(C)


31. The term auxin was coined by

(A) Skoog

(B) Haberlandt

(C) Miescher

(D) F.W. Went

Answer

Ans.(D)


32. Precursor of Indole acetic acid (natural auxin) is

(A) Glycine

(B) Methionine

(C) Isopentynyl pyrophosphate

(D) Tryptophan

Answer

Ans.(D)


33. All the following hormones are growth inhibitors except

(A) Absiccic acid

(B) dormin

(C) ethylene

(D) IAA

Answer

Ans.(D)


34. Which of the following is a gaseous hormone

(A) IBA

(B) NAA

(C) Abscicic acid

(D) Ethylene

Answer

Ans.(D)


35. Which of the following bioassays are used to detect the presence of auxin

(A) Avena curvature test and tobacco pith culture

(B) Split pea stem curvature test and tobacco pith culture

(C) Avena curvature test and Split pea stem curvature test

(D) tobacco pith culture only

Answer

Ans.(C)


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