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31 Years NEET Previous Year Questions: Plant Growth & Development - 2


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25 Questions MCQ Test Biology Class 11 | 31 Years NEET Previous Year Questions: Plant Growth & Development - 2

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 for NEET 2022 is part of Biology Class 11 preparation. The 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 questions and answers have been prepared according to the NEET exam syllabus.The 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 below.
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31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 1

Seed dormancy is due to the [2002]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 1

Ethylene breaks dormancy of different plants. Abscisic acid induces dormancy in seeds, buds and underground storage organs

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 2

Proteinaceous pigment which control activities concerned with light [2001]

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 3

Glycolate induces opening of stomata in [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 3

During day time, due to photosynthesis CO2 concentration is low.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 4

Which one is a long-day plant? [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 4

 Long day plants undergo flowering after receiving light above a critical day length. e.g. Spinach, sugarbeet.  Short day plants flower only when they receive light below  a critical  day length. e.g. Glycine max, Tobacco.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 5

Which of the following prevents fall of fruits?[2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 5

NAA or Naphthalene Acetic Acid is synthetic auxin. It is used to check fruit fall specially in tomato.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 6

Hormone responsible for senescence [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 6

ABA or Abscisic acid is responsible for leaf fall or senescence.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 7

What breaks bud dormancy of potato tuber? [2001]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 7

 IAA promotes apical dominance. ABA induces dormancy in buds.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 8

Geocarpic fruits are produced by [2000, 02]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 8

 Geocarpic fruits are those which develop underground. Groundnut is the fruit which develops underground, onion and carrot also occur within the soil but onion is modified stem while carrot is modified root.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 9

What reason will you assign for coconut milk used in tissue culture? [2000, 03]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 9

The medium in tissue culture provides all the essential nutrients required for growth and division of callus. Coconut milk contains cytokinins which is useful in tissue culture.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 10

The method that renders the seed coat permeable to water so that embryo expansion is not physically retarded is [2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 10

Scarification is the breaking of the seed coat  barriers which can be done by mechanical or chemical methods. 

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 11

ABA is involved in [1999]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 11

Gibberellins are involved in shoot elongation. Auxins are important in root elongation and cell division

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 12

The response of different organisms to environmental rhythms of light and darkness is called [1998]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 12

Photoperiodism is the effect of duration of light and darkness on the growth, development and behaviour of an organism.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 13

A plant hormone  used for inducing morphogenesis in plant tissue culture is [1998]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 13

 Cytokinins are used in tissue culture to induce shooting of the cultural callus.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 14

Which combination of gases is suitable for fruit ripening? [1998]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 14

Ethylene acts physiologically as a hormone in plants. It stimulates the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves. Its biosynthesis starts from methionine with 1-aminocyclopropane-1-carboxylic acid (ACC) as a key intermediate.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 15

If a tree, flowers thrice in a year (Oct., Jan. and July) in Northern India, it is said to be [1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 15

In northern India, during these  months there is observed maximum variation in light intensity and duration and temperature. Hence only plants that are photo-and thermoinsensitive can flower during these months.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 16

What will be the effect on phytochrome in a plant subjected to continuous red light? [1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 16

Continuous exposure to red light causes

  • Conversion of Pr to Pf which is rapidly destroyed.
  • Inhibition of synthesis of Pr.
  • Total amount of phytochrome decreases.
31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 17

Thigmotropic movement is best shown by [1995]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 17

The phenomenon of thigmotropism is a response to contact with a solid object. It is exhibited by tendrils of climbing plants that grow around a pole or the stem of another plant.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 18

Ethylene gas is used for [1995]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 18

Ethylene is a gaseous plant hormone which plays an important role in fruit ripening. In the presence of ethylene there is an increase in the rate of respiration.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 19

The pigment, that absorbs red and far red light in plants, is [1995, 97, 2002]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 19

The pigment phytochrome is involved in flowering and many other light-mediated processes. It absorbs red and far red light in plants for photosynthesis.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 20

Movement of auxin is [1994]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 20

Auxin is a plant hormone which is involved in various physiological processes of plant. It is synthesized in meristematic tissue like tip of root and stem. In stems, movement of auxin is basipetal. It moves from apex to the base. However, in roots, movement of auxin is acropetal. It moves from the root to the shoot apex.

Thus, the correct answer is option D.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 21

Removal of apical bud results in [1993, 2000]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 21

 Apical buds inhibit lateral branching due to apical dominance. Removal of apical bud promotes lateral branching.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 22

The regulator which retards ageing/ senescence of plant parts is : [1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 22

Cytokinin help in retaining chlorophyll, hence delay senescense.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 23

What is a stress hormone? or The hormone produced during adverse environmental conditions is [1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 23

Abscisic Acid (ABA) is called stress hormone which works in adverse environmental condition when there is low water content in atmosphere or in drought conditions. ABA causes the stomatal closure of leaves due to which the water loss by the plant is minimized.

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 24

Klinostat is employed in the study of [1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 24

Klinostat = Clinostat is an apparatus used to nullify the effect of geotropism. It has a clock to the main axis of which is attached to a rod. Top of the rod is attached to a flower pot. The klinostat is kept in horizontal position and allowed to rotate (to nullify the geotropism) and plant growth is observed

31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 25

Dwarfness can be controlled by treating the plant with [1992, 2002]

Detailed Solution for 31 Years NEET Previous Year Questions: Plant Growth & Development - 2 - Question 25

One of the most important effects of gibberellins is the reversal of dwarfism (even in genetically dwarf plants). Dwarf pea & dwarf corn attain almost normal size when treated with gibberellins. It has been proved that dwarf plants have lower level of GA which causes the dwarfism. Thus the external supply causes rapid elongation of internodes. GA does not have any effect of elongation on normal (non dwarf or tall) plant.

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