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Plant - Growth and Development — NEET UG Botany PYQs

757 previous year questions from Plant - Growth and Development with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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1

Heterophyllous development in response to environment is an example of which of the following phenomena ?

NEET 2026 Solution View → 2

Length of the stem at time 0 is 20 cm. The arithmetic growth rate is 30 cm per day. What is the length of the stem at the end of the 7^ th day ?

NEET 2026 Solution View → 3

Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage ?

NEET 2026 Solution View → 4

Which one of the following is not a characteristic of plant cells in the phase of elongation ?

NEET 2026 Solution View → 5

Match List I with List II : List I (Growth Regulator) List II (Function/Effect) A. 2,4 -D I. Brewing industry B. GA ₃ II. Stimulation of stomatal closure C. Kinetin III. Herbicide

NEET 2026 Solution View → 6

Which of the following plant growth regulators is used as herbicide ?

NEET 2026 Solution View → 7

Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?

NEET 2025 Solution View → 8

Read the following statements on plant growth and development. (A) Parthenocarpy can be induced by auxins. (B) Plant growth regulators can be involved in promotion as well as inhib

NEET 2025 Solution View → 9

Given below are some statements about plant growth regulators. A. All GAs are acidic in nature. B. Auxins are antagonists to GAs. C. Zeatin was isolated from coconut milk. D. Ethyl

NEET 2024 Solution View → 10

Match List-I with List-II : array lll & List-I & & List-II .& Abscisic acid & I.& Promotes female flowers in cucumber .& Ethylene & II.& Helps seeds to withstand desiccation .& Gib

NEET 2024 Solution View → 11

F. Skoog observed that callus proliferated from the internodal segments of tobacco stem when auxin was supplied with one of the following except :

NEET 2024 Solution View → 12

Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

NEET 2024 Solution View → 13

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin

NEET 2024 Solution View → 14

The phenomenon which is influenced by auxin and also played a major role in its discovery :

NEET 2023 Solution View → 15

Which hormone promotes internode / petiole elongation in deep water rice?

NEET 2023 Solution View → 16

Match List-I with List-II Choose the correct answer from the options given below:

NEET 2023 Solution View → 17

Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?

NEET 2023 Solution View → 18

Which of the following statements is not correct?

NEET 2023 Solution View → 19

In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as:

NEET 2023 Solution View → 20

Which of the following growth regulators is an adenine derivative?

NEET 2022 Solution View → 21

The gaseous plant growth regulator is used in plants to:

NEET 2022 Solution View → 22

The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures is called :

NEET 2022 Solution View → 23

Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to p

NEET 2022 Solution View → 24

Which one of the following plants does not show plasticity?

NEET 2022 Solution View → 25

The site of perception of light in plants during photoperiodism is:

NEET 2021 Solution View → 26

The plant hormone used to destroy weeds in a field is:

NEET 2021 Solution View → 27

Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called:

NEET 2021 Solution View → 28

Who coined the term 'Kinetin'?

NEET 2020 Solution View → 29

Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:

NEET 2020 Solution View → 30

Match the following concerning the activity/function and the phytohormone involved:- (a) Fruit ripener (i) Abscisic acid (b) Herbicide (ii) GA 3 (c) Bolting agent (iii) 2 , 4 - D (

NEET 2020 Solution View → 31

Which of the following is not an inhibitory substance governing seed dormancy?

NEET 2020 Solution View → 32

The process of growth is maximum during

NEET 2020 Solution View → 33

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

NEET 2020 Solution View → 34

Read the given statements and identify the PGRs X, Y and Z . X induces accumulation of salts inside the cells. Y promotes rapid elongation of leaf bases and internodes in deep wate

AIIMS 2019 Solution View → 35

Which hormone inhibits morphogenesis?

AIIMS 2019 Solution View → 36

Which of the following sets does not include all natural plant growth regulators?

AIIMS 2019 Solution View → 37

Assertion : In vernalisation, flowering is induced by low temperature. Reason : ABA is growth inhibiting hormone.

AIIMS 2019 Solution View → 38

Assertion : Gibberellic acid increases length of grape stalks. Reason : Ethophon hastens fruit ripening in tomato and apple.

AIIMS 2019 Solution View → 39

Removal of shoot tips is very useful technique to boost the production of tea leaves. This is because

NEET 2019 Solution View → 40

In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?

NEET 2019 Solution View → 41

It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the

NEET 2019 Solution View → 42

What is the site of perception of photoperiod necessary for induction of flowering in plants?

NEET 2019 Solution View → 43

Which of the following is not a bioassay for cytokinins?

AIIMS 2018 Solution View → 44

Which among the following are auxins?

AIIMS 2018 Solution View → 45

Which of the following is not a plant growth inhibitor?

JIPMER 2018 Solution View → 46

Identify the incorrect statement about ABA growth regulator.

AIIMS 2017 Solution View → 47

Which one of the following generally acts as an antagonist to gibberellins?

JIPMER 2017 Solution View → 48

Fruit and leaf drop at early stages can be prevented by the application of

NEET 2017 Solution View → 49

One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stre

AIIMS 2016 Solution View → 50

Assertion : Storage of seeds at low temperature is possible. Reason : Respiration and enzymatic activity of seeds are very high at low temperature.

AIIMS 2016 Solution View → 51

Compare the statement I and II and choose the correct option. Statement I In the flowering plants due to higher accumulation of auxins dormancy of lateral buds occurs. Statement II

JIPMER 2016 Solution View → 52

You are given tissue with its potential for differentiation in artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as

NEET 2016 Solution View → 53

The Avena curvature is used for bioassay of:

NEET 2016 Solution View → 54

Gibberellins can promote seed germination because of their influence on

AIIMS 2015 Solution View → 55

Assertion : A correct concentration of auxin and cytokinin is required for the development of root and shoot in a callus. Reason : When the ratio of kinetin to auxin is high, then

AIIMS 2015 Solution View → 56

Assertion : Plant growth regulators (PGRs) are very important for plant growth and development. Reason : Auxins do not induce flowering in gymnosperms.

AIIMS 2015 Solution View → 57

Compare the statements I and II and choose correct option. Statement (I) Auxin promote apical dominance by suppressing the activity of lateral buds. Statement (II) In moriculture,

JIPMER 2015 Solution View → 58

What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows?

NEET 2015 Solution View → 59

Typical growth curve in plants is:

NEET 2015 Solution View → 60

Auxin can be bio assayed by:

NEET 2015 Solution View → 61

Vernalisation is subjected to plants growing in

AIIMS 2014 Solution View → 62

Ethylene is related with

JIPMER 2014 Solution View → 63

Dr F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly- cut coleoptile stumps. O

NEET 2014 Solution View → 64

A few normal seedlings of tomato were kept in a dark room. After a few days, they were found to have become white-colored like albinos, Which of the following terms will you use to

NEET 2014 Solution View → 65

Which one of the following growth regulators is known as stress hormone?

NEET 2014 Solution View → 66

Which of the following plant growth regulators (PGRs) promotes root initiation, flowering and induced parthenocarpy?

AIIMS 2013 Solution View → 67

Assertion : On plotting the length of the root against time, a linear curve is obtained. Reason : An elongating root exemplifies arithmetic growth.

AIIMS 2013 Solution View → 68

Hormone inducing fruit ripening is

JIPMER 2013 Solution View → 69

Which of the following properties is shown by cytokinins?

JIPMER 2013 Solution View → 70

Genetic dwarfism can be overcome by

JIPMER 2013 Solution View → 71

Which of the following is not an auxin?

JIPMER 2013 Solution View → 72

Tissue culture technique can produce infinite number or new plants from a small parental tissue. The economic importance of the technique is in raising:

NEET 2013 Solution View → 73

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of:

NEET 2013 Solution View → 74

During seed germination its stored food is mobilised by

NEET 2013 Solution View → 75

Abscisic acid is known as the stress hormone because it

AIIMS 2012 Solution View → 76

Through their effect on plant growth regulators, what do the temperature and light control in the plants?

NEET 2012 Solution View → 77

Which one of the following generally acts as an antagonist to gibberellins?

NEET 2012 Solution View → 78

Vernalization stimulates flowering in

NEET 2012 Solution View → 79

Bacteria, fungi, lower plants survive in adverse conditions by

AIIMS 2011 Solution View → 80

What are labelled phases A, B and C in given sigmoidal growth curve? A B C

AIIMS 2011 Solution View → 81

Assertion : Plant growth as a whole is indefinite. Reason : Plants retain the capacity of continuous growth throughout their life.

AIIMS 2011 Solution View → 82

Which one of the following pairs, is not correctly matched?

JIPMER 2011 Solution View → 83

Refer the given figures on photoperiodism and select the correct option.

AIIMS 2010 Solution View → 84

The bioassay of auxin is

JIPMER 2010 Solution View → 85

Phototropic curvature is the result of uneven distribution of

NEET 2010 Solution View → 86

Photoperiodism was first characterised in

NEET 2010 Solution View → 87

Root development is promoted by

NEET 2010 Solution View → 88

One of the commonly used plant growth hormone in tea plantations is

NEET 2010 Solution View → 89

Assertion : Cytokinins increases shelf life of fruits and vegetables. Reason : Cytokinins induce cell division.

AIIMS 2009 Solution View → 90

The bioassay of auxin is

JIPMER 2009 Solution View → 91

Induction of flowering by low temperature treatment is

JIPMER 2009 Solution View → 92

Which of the following theory gives the latest explanation for the closure of stomata?

JIPMER 2009 Solution View → 93

One of the synthetic auxin is

NEET 2009 Solution View → 94

A country with a high rate of population growth took measures to reduce it. The figure below shows age sex pyramids of populations. A and B twenty years apart. Select the correct i

NEET 2009 Solution View → 95

Which one of the following acids is a derivative of carotenoids?

NEET 2009 Solution View → 96

One of the synthetic auxin is :

NEET 2009 Solution View → 97

Somaclones are obtained by

NEET 2009 Solution View → 98

Which one of the following acids is a derivative of carotenoids ?

NEET 2009 Solution View → 99

Solenocytes are associated with

JIPMER 2008 Solution View → 100

Compound squamous epithelium is found in

JIPMER 2008 Solution View → 101

Phytochrome is present in

JIPMER 2008 Solution View → 102

Mesozoic era is Golden period of

JIPMER 2008 Solution View → 103

Which one of the following is a natural growth inhibitor ?

JIPMER 2008 Solution View → 104

Which of the following plant is LDP ?

JIPMER 2008 Solution View → 105

Apical dominance is caused by

JIPMER 2008 Solution View → 106

Which one is the sweetest sugar ?

JIPMER 2008 Solution View → 107

Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

NEET 2008 Solution View → 108

The slow rate of decomposition of fallen logs in nature is due to their

NEET 2008 Solution View → 109

Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

NEET 2008 Solution View → 110

In germinating seeds fatty acids are degrad exclusively in the

NEET 2008 Solution View → 111

Importance of day length in flowering of plants was first shown in

NEET 2008 Solution View → 112

Importance of day length in flowering of plants was first shown in

NEET 2008 Solution View → 113

Assertion : Vernalization is acceleration of subsquent flowering by low temperature treatment. Reason : Site of vernalization is apical meristem.

AIIMS 2007 Solution View → 114

Which one of the following pairs, is not correctly matched?

NEET 2007 Solution View → 115

"Foolish seedling" disease of rice led to the discovery of:

NEET 2007 Solution View → 116

Opening of floral buds into flowers, is a type of:

NEET 2007 Solution View → 117

Avena curvature test is a bioassay for examining the activity of

AIIMS 2006 Solution View → 118

Gibberellin was first extracted from :

JIPMER 2006 Solution View → 119

Treatment of seeds at low temperature under moist conditions to break its dormancy is called:

NEET 2006 Solution View → 120

How does pruning help in making the hedge dense?

NEET 2006 Solution View →
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