NEET Biology Plant Growth and Development Notes

Plant Growth And Development MCQ Questions with Answers Class 11 Biology

Question. The growth in plants differs from growth in animals in

(1) Being localized and indefinite

(2) Being indefinite

(3) Having indefinite life span

(4) Having definite life span

Answer (1)

Question. Select an incorrect match

(1) Tryptophan - Auxin

(2) Methionine - Ethylene

(3) tRNA - Cytokinin

(4) Violaxanthin - GA₃

Answer (4)

Question. Find odd one w.r.t. differentiation

(1) Loss of nucleus in sieve

(2) Death of protoplasm in tracheary elements

(3) Callus formation

(4) Lignification in vessels

Answer (3)

Question. Growth in plant organs is

(1) Qualitative and extrinsic

(2) Quantitative and intrinsic

(3) Qualitative and intrinsic

(4) Quantitative and extrinsic

Answer (2)

Question. Which of the given is/are examples of differentiation?

(1) Loss of nucleus and perforations in some sieve tube members

(2) Lignin deposition in tracheids and vessels

(3) Differential wall thickening in guard cells

(4) More than one option is correct

Answer (4)

Question. Which is not a physiological effect of auxins?

(1) Cell elongation

(2) Development of parthenocarpic fruits

(3) Prevention of abscission of leaves and fruits

(4) Reversal of genetic dwarfism

Answer (4)

Question. Larkspur, Ranunculus and cotton plants are similar in the presence of

(1) Developmental heterophylly

(2) Plasticity

(3) Environmental heterophylly

(4) Homospory

Answer (2)

Question. Pruning of tea plants is done to discard the effects of

(1) GA₃

(2) Auxin

(3) Cytokinin

(4) ABA

Answer (2)

Question. Find out the correct statement(s).

(a) Growth in plants is internal/intrinsic and open ended

(b) Formation of cellular materials is called real or protoplasmic growth

(c) Plant growth is diffused only during the early embryonic stage

(1) Only (a) & (b) (2) (b) only (3) Only (b) & (c) (4) (a), (b) & (c)

Answer (4)

Question.Number of female flowers can be increased by application of

(1) IAA

(2) C₂H₄

(3) CK

(4) All of these

Answer (4)

Question. Which of the following hormone is weak organic acid having unsaturated ring structures and derived from amino acid?

(1) Cytokinin

(2) Auxin

(3) Gibberellins

(4) Ethylene

Answer (2)

Question. Specific property attributed to GA is

(1) Shortening of genetically tall plants

(2) Elongation of genetically dwarf plants

(3) Rooting of stem cuttings

(4) Promotion of leaf and fruit fall

Answer (2)

Question. The direction of the transport of auxins is

(1) Polar in basipetal

(2) Polar in acropetal

(3) Through xylem

(4) Through phloem

Answer (1)

Question. The plant hormone which is basic in nature?

(1) Auxin

(2) Gibberellins

(3) Cytokinin

(4) Abscisic acid

Answer (3)

Question. If an etiolated stem could be first saturated with auxin by spraying and then exposed to a streak of light from one side, it will

(1) Bend towards the light

(2) Bend away from the light

(3) Grow straight upwards

(4) Be prevented from growing

Answer (1)

Question. Delay of senescence or Richmond Lang effect is a physiological effect of

(1) IAA

(2) CK

(3) GA

(4) C₂H₄

Answer (2)

Question. For flowering, critical dark period should always be exceeded in

(1) Long day plants

(2) Short day plants

(3) Day neutral plants

(4) All type of plants

Answer (2)

Question. Shelf life of vegetables and cut flowers can be increased by commercial application of

(1) Cytokinin

(2) AMO1618

(3) Cyclocel

(4) Phosphon-D

Answer (1)

Question. Cytokinins are said to be antiageing hormone because they delay the senescence by

(1) Controlling mobilisation of resources

(2) Controlling protein synthesis

(3) Decreased morphogenesis and high respiration

(4) Both (1) & (2)

Answer (4)

Question. Triple response is shown by hormone

(1) Ethylene

(2) CK

(3) 2, 4-D

(4) GA₃

Answer (1)

Question. The phytohormone combination which is the key regulator of cell differentiation and morphogenesis is

(1) Cytokinin & IAA

(2) IAA & ABA

(3) IAA & GA₃

(4) Cytokinin & Gibberellin

Answer (1)

Question. The hormone which can replace long days and low temperature requirement for flowering in some plants is

(1) Gibberellin

(2) Cytokinin

(3) Vernalin

(4) Ethylene

Answer (1)

Question. Gibberellin mediate amylase formation during germination of cereal grains is inhibited by

(1) Abscisic acid

(2) Ethylene

(3) Gibberellins

(4) Cytokinins

Answer (1)

Question. Which is not true for abscisic acid?

(1) Acts as antitranspirant

(2) Synthesized in chloroplast from carotenoids

(3) Increases stress tolerance in plants

(4) Induces epinasty of leaves and flowers

Answer (4)

Question. Condition of suspended growth due to external environmental conditions is called

(1) Dormancy

(2) Rest

(3) Quiescence

(4) All of these

Answer (3)

Question. CH₂= CH₂ is mainly responsible for

(1) Formation of internode

(2) Formation of nodes

(3) Ripening of fruits

(4) Formation of internodes

Answer (3)

Question. Which of the given event does not happen during seed germination?

(1) Emergence of radicle

(2) Increase in rate of respiration

(3) Hydrolysis of stored polysaccharides and proteins

(4) Photosynthesis by cotyledons

Answer (4)

Question. Which of the following statements does not characterize photoperiodism?

(1) Mediated by florigen hormone

(2) Conversion of shoot apex into reproductive apex

(3) Red light is stimulatory in SDP, LDP and DNP for flowering

(4) Photoperiodic stimulus is perceived by mature leaf

Answer (3)

Question. Which hormone stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses?

(1) ABA

(2) Cytokinin

(3) GA₃

(4) Auxin

Answer (1)

Question. Seed dormancy in tomato seeds is due to

(1) Impermeable seed coat

(2) Immature embryo

(3) Presence of ferulic acid in pulp

(4) Abscisic acid in pulp

Answer (3)

Plant Growth and Development