NEET Biology Plant Growth and Development MCQs Set 08

Practice MCQs for NEET Biology Plant Growth and Development

Review structured MCQ sets for NEET Biology Plant Growth and Development. Built according to official NEET guidelines, these downloadable questions support daily revision and core concept reinforcement.

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Multiple Choice Questions

Question 1: Which of the following hormone is weak organic acid having unsaturated ring structures and derived from amino acid?
(a) Cytokinin
(b) Auxin
(c) Gibberellins
(d) Ethylene
Show Answer & Explanation

Answer: (b) Auxin

Explanation:
1. Tryptophan is the amino acid from which auxin is derived.

Question 2: Specific property attributed to GA is
(a) Shortening of genetically tall plants
(b) Elongation of genetically dwarf plants
(c) Rooting of stem cuttings
(d) Promotion of leaf and fruit fall
Show Answer & Explanation

Answer: (b) Elongation of genetically dwarf plants

Explanation:
1. Gibberellines promote the internodal elongation.

Question 3: The plant hormone which is basic in nature?
(a) Auxin
(b) Gibberellins
(c) Cytokinin
(d) Abscisic acid
Show Answer & Explanation

Answer: (c) Cytokinin

Explanation:
1. Cytokinin is basic in nature while auxin, gibberelliness and abscisic acid are acidic in nature.

Question 4: The phytohormone combination which is the key regulator of cell differentiation and morphogenesis is
(a) Cytokinin & IAA
(b) IAA & ABA
(c) IAA & GA3
(d) Cytokinin & Gibberellin
Show Answer & Explanation

Answer: (a) Cytokinin & IAA

Explanation:
1. Auxin and Cytokinin hormones help in morphogenesis.

Question 5: Number of female flowers can be increased by application of
(a) IAA
(b) C2H4
(c) CK
(d) All of these
Show Answer & Explanation

Answer: (d) All of these

Explanation:
1. IAA, C2H4, CK all increases the number of female flowers.

Question 6: Triple response is shown by hormone
(a) Ethylene
(b) CK
(c) 2, 4-D
(d) GA3
Show Answer & Explanation

Answer: (a) Ethylene

Explanation:
1. Triple response include inhibition of elongation, promotion of lateral growth and swelling.

Question 7: Select an incorrect match
(a) Tryptophan - Auxin
(b) Methionine - Ethylene
(c) tRNA - Cytokinin
(d) Violaxanthin - GA3
Show Answer & Explanation

Answer: (d) Violaxanthin - GA3

Explanation:
1. GA3 —— Acetyl CoA.

Question 8: Which is not true for abscisic acid?
(a) Acts as antitranspirant
(b) Synthesized in chloroplast from carotenoids
(c) Increases stress tolerance in plants
(d) Induces epinasty of leaves and flowers
Show Answer & Explanation

Answer: (d) Induces epinasty of leaves and flowers

Explanation:
1. Epinasty induces by ethylene.

Question 9: 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) GA3
(d) Auxin
Show Answer & Explanation

Answer: (a) ABA

Explanation:
1. It acts as antitranspirant.

Question 10: Match the following<br />Column I Column II<br />a. Auxin (i) Root hair formation<br />b. Cytokinin (ii) Seed development<br />c. Ethylene (iii) Xylem differentiation<br />d. ABA (iv) Nutrient mobilisation
(a) a(iv), b(ii), c(iii), d(i)
(b) a(ii), b(iii), c(i), d(iv)
(c) a(i), b(iii), c(ii), d(iv)
(d) a(iii), b(iv), c(i), d(ii)
Show Answer & Explanation

Answer: (d) a(iii), b(iv), c(i), d(ii)

Explanation:
1. This option, a(iii), b(iv), c(i), d(ii), is the one that agrees with the standard NCERT facts for this topic.

Question 11: Seed dormancy in tomato seeds is due to
(a) Impermeable seed coat
(b) Immature embryo
(c) Presence of ferulic acid in pulp
(d) Abscisic acid in pulp
Show Answer & Explanation

Answer: (c) Presence of ferulic acid in pulp

Explanation:
1. In tomato, seed dormancy occurs due to presence of ferulic acid in pulp.

Question 12: For flowering, critical dark period should always be exceeded in
(a) Long day plants
(b) Short day plants
(c) Day neutral plants
(d) All type of plants
Show Answer & Explanation

Answer: (b) Short day plants

Explanation:
1. They require light below critical light / photoperiod.

Question 13: Which of the following statements does not characterize photoperiodism?
(a) Mediated by florigen hormone
(b) Conversion of shoot apex into reproductive apex
(c) Red light is stimulatory in SDP, LDP and DNP for flowering
(d) Photoperiodic stimulus is perceived by mature leaf
Show Answer & Explanation

Answer: (c) Red light is stimulatory in SDP, LDP and DNP for flowering

Explanation:
1. Photoperiodic induction : The photoperiod-regulated process that occurs in the leaves resulting in the trans- mission of floral stimulus to shoot apex is collectively as photoperiodic induction.
2. Number of photoperiodic induction varies from plants to plants. i.e., duration of light and dark period.

Question 14: Hypothetical 'florigen' could be produced prematurely in long day plant by exposing it to
(a) Shortening light period
(b) Red light during night
(c) Extending dark period
(d) Far red light
Show Answer & Explanation

Answer: (b) Red light during night

Explanation:
1. Pfr Since for long day plants  1 . Now day length does not have direct effect on buds but it causes leaves Pr to mature a hormone that moves from leaves to buds i.e., florigen in presence of red light Pr converted into P fr .

Question 15: Which of the following pair is mismatched?
(a) Triticum aestivum - LDP
(b) Zea mays - DNP
(c) Glycine max - SDP
(d) Raphanus sativus - SLDP
Show Answer & Explanation

Answer: (d) Raphanus sativus - SLDP

Explanation:
1. Radish is LDP.

Question 16: Which is not a requirement of vernalisation?
(a) Aerobic condition
(b) Moisture
(c) Low temperature
(d) Differentiated tissues
Show Answer & Explanation

Answer: (d) Differentiated tissues

Explanation:
1. Vernalisation occurs at meristematic tissue.

Question 17: You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
(a) IAA and gibberellin
(b) Auxin and cytokinin
(c) Auxin and abscisic acid
(d) Gibberellin and abscisic acid
Show Answer & Explanation

Answer: (b) Auxin and cytokinin

Explanation:
1. Auxins and cytokinin induce development of root and shoot in a culture medium (respectively).

Question 18: Phytochrome is a
(a) Flavoprotein
(b) Glycoprotein
(c) Lipoprotein
(d) Chromoprotein
Show Answer & Explanation

Answer: (d) Chromoprotein

Explanation:
1. Photochrome is a blue-green pigment which absorb red and far red light.
2. It is a coloured protein i.e. chromoprotein.

Question 19: The avena curvature is used for bioassay of
(a) Ethylene
(b) ABA
(c) GA3
(d) IAA
Show Answer & Explanation

Answer: (d) IAA

Explanation:
1. Bioassay - It is a quantitative and qualitative test used to determine the nature and function of a biochemical by using living material e.g., Avena curvature test used as bioassay for auxins.

Question 20: What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?
(a) Auxin accumulates on the shaded side, stimulating greater cell elongation there
(b) Green plants need light to perform photosynthesis
(c) Green plants seek light because they are phototropic
(d) Light stimulates plant cells on the lighted side to grow faster
Show Answer & Explanation

Answer: (a) Auxin accumulates on the shaded side, stimulating greater cell elongation there

Explanation:
1. Auxin accumulated towards dark side and increase cell elongation, then bending occurs.

Question 21: A few normal seedings of tomato were kept in a dark room. After a few days they were found to have become white- coloured like albinos. Which of the following terms will you use to describe them?
(a) Mutated
(b) Embolised
(c) Etiolated
(d) Defoliated
Show Answer & Explanation

Answer: (c) Etiolated

Explanation:
1. Yellowing of leaves due to absence of light is known as etiolation.

Question 22: Which one of the following growth regulators is known as stress hormone?
(a) Abscissic acid
(b) Ethylene
(c) GA3
(d) Indole acetic acid
Show Answer & Explanation

Answer: (a) Abscissic acid

Explanation:
1. Synthesis of abscisic acid stimulated by drought and other adverse condition, thus it is called stress hormone.

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