NEET Biology Plant Growth and Development MCQs Set A

Question. Which of the following structures show unlimited growth in plants?
(a) Roots
(b) Fruits
(c) Flowers
(d) Leaves

Answer: A

Question. Growth of an organ is defined as
(a) Irreversible increase in size
(b) Infinite and reversible increase in size
(c) Infinite increase in size
(d) Reversible increase in size

Answer: A

Question. Which type of cells have the capacity of self perpetuation?
(a) Meristematic cells
(b) Companion cells
(c) Sieve cells
(d) Parenchyma cells

Answer: A

Question. Plant growth is unique in being
(a) Unlimited
(b) Diffuse
(c) Limited
(d) Closed

Answer: A

Question. Increase in the girth of plant is known as/done by
(a) Secondary growth
(b) Intercalary meristem
(c) Apical meristem
(d) Primary growth

Answer: A

Question. Examples of lateral meristems are
(a) Vascular cambium and cork cambium
(b) Phellogen and collenchyma
(c) Vascular cambium and phellem
(d) Xylem and cork cambium

Answer: A

Question. Which parameter is used to measure the growth in flat organs like leaves?
(a) Increase in surface area
(b) Increase in dry weight
(c) Increase in cell size
(d) Increase in length

Answer: A

Question. Which of the following is difficult to measure directly?
(a) Increase in protoplasm content
(b) Increase in dry weight
(c) Increase in surface area
(d) Increase in volume

Answer: A

Question. Deposition of new materials inside the cell wall of cells starts in
(a) Elongation phase
(b) Maturation phase
(c) Reproductive phase
(d) Meristematic phase

Answer: A

Question. Which phase of a sigmoid curve explains the initial phase of growth when growth rate is very slow?
(a) Lag phase
(b) Log phase
(c) Stationary phase
(d) Maturation phase

Answer: A

Question. ______ curve is obtained for cells in culture.
(a) S-shaped
(b) V-shaped
(c) Linear
(d) J-shaped

Answer: A

Question. What happens to the growth of roots during water logging conditions?
(a) Growth is inhibited
(b) First growth is accelerated and then stops
(c) Growth is accelerated
(d) Growth remains constant

Answer: A

Question. Which of the following is not a function of water in plants?
(a) It acts as a source of energy
(b) It is responsible for cell elongation
(c) It maintains the turgidity of cells
(d) It provides medium for enzymatic activities

Answer: A

Question. Which abiotic factor is not essential for early growth of the plant but growth is sustained only in its presence?
(a) Light
(b) Nutrients
(c) Oxygen
(d) Water

Answer: A

Question. Which factor determines the direction of movement of main root and stem?
(a) Gravity
(b) Oxygen
(c) Temperature
(d) Nutrients

Answer: A

Question. Tracheids do not collapse under extreme tension due to the presence of
(a) Strong, elastic lignocellulosic secondary cell wall
(b) Thin, elastic, cellulosic primary cell wall
(c) Thick, cellulosic primary cell wall
(d) Thick, hard suberised secondary cell wall

Answer: A

Question. Cork, secondary cortex and secondary xylem are formed through
(a) Redifferentiation
(b) Dedifferentiation
(c) Differentiation
(d) Obliteration

Answer: A

Question. Which of the following is formed after dedifferentiation?
(a) Interfascicular vascular cambium
(b) Secondary cortex
(c) Secondary phloem
(d) Parenchyma

Answer: A

Question. Plant growth regulators (PGRs) are
(a) Simple organic substances of different chemical composition
(b) Complex organic substances of different chemical composition
(c) Simple and complex organic substances of same chemical composition
(d) Small organic substances of same chemical composition

Answer: A

Question. The ability of a plant to follow different pathways and produce different structures in response to environment is known as
(a) Plasticity
(b) Heterophylly
(c) Efficiency index
(d) Vernalisation

Answer: A

Question. Heterophylly means
(a) The appearance of different forms of leaves on the same plant species
(b) The appearance of same form of leaves on different plants
(c) The appearance of same form of flowers on different plants
(d) The appearance of different forms of fruits on the same plant

Answer: A

Question. Which type of phytohormone is made up of indole compounds?
(a) Auxin
(b) Gibberellins
(c) ABA
(d) Zeatin

Answer: A

Question. Two synthetic auxins are
(a) 2, 4-D and NAA
(b) IAA and NAA
(c) 2, 4-D and IBA
(d) IAA and IBA

Answer: A

Question. Which phytohormone promotes falling of old leaves whereas inhibits falling of young leaves?
(a) Auxin
(b) GA
(c) Cytokinin
(d) ABA

Answer: A

Question. Which auxins are used in diluted form to produce parthenocarpic fruits?
(a) IAA and IBA
(b) 2, 4-D and IBA
(c) NAA and GA
(d) 2, 4-D and IAA

Answer: A

Question. Which of the following auxin is widely used as weedicide?
(a) 2, 4-D
(b) NAA
(c) IBA
(d) IAA

Answer: A

Question. Which of the following is not a function of gibberellic acid?
(a) Ripening
(b) Seed germination
(c) Bolting

Answer: A

Question. Apical dominance is stimulated by auxin whereas it is inhibited by
(a) Cytokinin
(b) Gibberellic acid
(c) ABA
(d) Ethylene

Answer: A

Question. Phytohormones responsible for cell division in callus are ______ and ______.
(a) Auxin and cytokinin
(b) ABA and cytokinin
(c) Gibberellin and ethylene
(d) Ethylene and cytokinin

Answer: A

Question. Which phytohormone is synthesised in ripened fruits?
(a) Ethylene
(b) Cytokinin
(c) Auxin
(d) ABA

Answer: A

Question. Which of the following is incorrect about ethylene?
(a) It is natural and derivative of carotenoids
(b) Promotes root hair formation
(c) It increases the number of female flowers
(d) It causes synchronisation of flowering and fruit set in pineapples

Answer: A

Question. Select a correct match
(a) GA₃ – Early seed production in conifers
(b) Auxin – Overcomes senescence
(c) Cytokinin – Synchronise fruit set in pineapples
(d) Ethylene – Seed maturation and development

Answer: A

Question. Which of the following phytohormone is a derivative of carotenoids?
(a) ABA
(b) Ethylene
(c) Cytokinin
(d) Auxin

Answer: A

Question. Dormancy of seeds is broken by ethylene whereas it is induced by
(a) Abscisic acid
(b) Auxin
(c) Cytokinin
(d) Gibberellic acid

Answer: A

Question. The plant hormone which closes the stomata in stressful conditions is
(a) ABA
(b) Auxin
(c) GA
(d) Cytokinin

Answer: A

Question. Both ethylene and ABA are responsible for
(a) Promoting the abscission of leaves and fruits
(b) Stimulation of apical dominance
(c) Inducing dormancy of seeds
(d) Ripening

Answer: A

Question. _________ is a period when growth and development is temporarily stopped
(a) Dormancy
(b) Abscission
(c) Senescence
(d) Vernalisation

Answer: A

Question. Which type of plants can blossom throughout the year?
(a) Day neutral plants
(b) Short-day plants
(c) Short-long day plants
(d) Long day plants

Answer: A

Question. Which of the following is an example of short day plant?
(a) Tobacco
(b) Sugarbeet
(c) Wheat
(d) Radish

Answer: A

Question. Most of the winter flowering plants belong to
(a) Short day plants
(b) Day neutral plants
(c) Long day plants
(d) Short long day plants

Answer: A

Question. Cucumber and tomato are the examples of
(a) Day neutral plants
(b) Short day plants
(c) Long day plants
(d) Long short day plants

Answer: A

Question. The site of preception of light in plants for flowering is
(a) Leaves
(b) Stems
(c) Fruits
(d) Roots

Answer: A

Question. Some plants like sugarbeet and cabbage required low temperature for flowering. This phenomenon is called
(a) Vernalisation
(b) Abscission
(c) Parthenocarpy
(d) Photoperiodism

Answer: A

Question. Which of the following is incorrect about vernalisation?
(a) It is the resting stage of seeds
(b) It is observed in winter variety of wheat
(c) It prevents precocious reproductive development
(d) Flowering is stimulated by low temperature

Answer: A

Question. Growth in plant organs is
(a) Quantitative and intrinsic
(b) Quantitative and extrinsic
(c) Qualitative and extrinsic
(d) Qualitative and intrinsic

Answer: A

Question. The growth in plants differs from growth in animals in
(a) Being localized and indefinite
(b) Having indefinite life span
(c) Being indefinite
(d) Having definite life span

Answer: A

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
(a) (a), (b) & (c)
(b) Only (b) & (c)
(c) (b) only
(d) Only (a) & (b)

Answer: A

Question.  Find odd one w.r.t. differentiation
(a) Callus formation
(b) Death of protoplasm in tracheary elements
(c) Loss of nucleus in sieve
(d) Lignification in vessels

Answer: A

Question. Which of the given is/are examples of differentiation
(a) More than one option is correct
(b) Differential wall thickening in guard cells
(c) Lignin deposition in tracheids and vessels
(d) Loss of nucleus and perforations in some sieve tube members

Answer: A

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
(a) Bend towards the light
(b) Grow straight upwards
(c) Bend away from the light
(d) Be prevented from growing

Answer: A

Question. Which is not a physiological effect of auxins?
(a) Reversal of genetic dwarfism
(b) Cell elongation
(c) Development of parthenocarpic fruits
(d) Prevention of abscission of leaves and fruits

Answer: A

Question. The direction of the transport of auxins is
(a) Polar in basipetal
(b) Through phloem
(c) Through xylem
(d) Polar in acropetal

Answer: A

Question. Larkspur, Ranunculus and cotton plants are similar in the presence of
(a) Plasticity
(b) Homospory
(c) Developmental heterophylly
(d) Environmental heterophylly

Answer: A

Question. Pruning of tea plants is done to discard the effects of
(a) Auxin
(b) Cytokinin
(c) ABA
(d) GA₃

Answer: A

Question. Which of the following hormone is weak organic acid having unsaturated ring structures and derived from amino acid?
(a) Auxin
(b) Cytokinin
(c) Ethylene
(d) Gibberellins

Answer: A

Question.  Specific property attributed to GA is
(a) Elongation of genetically dwarf plants
(b) Promotion of leaf and fruit fall
(c) Shortening of genetically tall plants
(d) Rooting of stem cuttings

Answer: A

Question. The plant hormone which is basic in nature?
(a) Cytokinin
(b) Abscisic acid
(c) Gibberellins
(d) Auxin

Answer: A

Question. Delay of senescence or Richmond Lang effect is a physiological effect of
(a) CK
(b) GA
(c) IAA
(d) None of these

Answer: A

Question. Shelf life of vegetables and cut flowers can be increased by commercial application of
(a) Cytokinin
(b) AMO1618
(c) Cyclocel
(d) Phosphon-D

Answer: A

Question. The phytohormone combination which is the key regulator of cell differentiation and morphogenesis is
(a) Cytokinin & IAA
(b) IAA & GA₃
(c) IAA & ABA
(d) Cytokinin & Gibberellin

Answer: A

Question. Cytokinins are said to be antiageing hormone because they delay the senescence by
(a) Both
(b) Controlling protein synthesis
(c) Controlling mobilisation of resources
(d) None of these

Answer: A

Question. The phytohormone combination which is the key regulator of cell differentiation and morphogenesis is
(a) Cytokinin & IAA
(b) IAA & GA₃
(c) IAA & ABA
(d) Cytokinin & Gibberellin

Answer: A

Question. Cytokinins are said to be antiageing hormone because they delay the senescence by
(a) Both
(b) Controlling protein synthesis
(c) Controlling mobilisation of resources
(d) None of these

Answer: A

Question. Shelf life of vegetables and cut flowers can be increased by commercial application of
(a) Cytokinin
(b) AMO1618
(c) Cyclocel
(d) Phosphon-D

Answer: A

Question. Triple response is shown by hormone
(a) Ethylene
(b) CK
(c) 2, 4-D
(d) GA₃

Answer: A

Question. The hormone which can replace long days and low temperature requirement for flowering in some plants is
(a) Gibberellin
(b) Cytokinin
(c) Vernalin
(d) Ethylene

Answer: A

Question. Gibberellin mediate amylase formation during germination of cereal grains is inhibited by
(a) Abscisic acid
(b) Gibberellins
(c) Ethylene
(d) Cytokinins

Answer: A

Question. Select an incorrect match
(a) Violaxanthin - GA₃
(b) tRNA - Cytokinin
(c) Methionine - Ethylene
(d) Tryptophan - Auxin

Answer: A

Question. Which is not true for abscisic acid?
(a) Induces epinasty of leaves and flowers
(b) Synthesized in chloroplast from carotenoids
(c) Acts as antitranspirant
(d) Increases stress tolerance in plants

Answer: A

Question. Which hormone stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses?
(a)   ABA
(b) Cytokinin
(c) Auxin
(d) GA₃

Answer: A

Question. Condition of suspended growth due to external environmental conditions is called
(a) Quiescence
(b) All of these
(c)   Rest
(d) Dormancy

Answer: A

Question. Seed dormancy in tomato seeds is due to
(a) Presence of ferulic acid in pulp
(b) Impermeable seed coat
(c) Immature embryo
(d) Abscisic acid in pulp

Answer: A

Question. Which of the given event does not happen during seed germination?
(a) Photosynthesis by cotyledons
(b) Increase in rate of respiration
(c) Emergence of radicle
(d) Hydrolysis of stored polysaccharides and proteins

Answer: A

Question. For flowering, critical dark period should always be exceeded in
(a) Short day plants
(b) All type of plants
(c) Long day plants
(d) Day neutral plants

Answer: A