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Test: Plant Growth & Development - 3


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25 Questions MCQ Test Biology Class 11 | Test: Plant Growth & Development - 3

Test: Plant Growth & Development - 3 for NEET 2022 is part of Biology Class 11 preparation. The Test: Plant Growth & Development - 3 questions and answers have been prepared according to the NEET exam syllabus.The Test: Plant Growth & Development - 3 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Plant Growth & Development - 3 below.
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Test: Plant Growth & Development - 3 - Question 1

The differentiated cells have lost the capacity to divide can regain the capacity of division under certain conditions called as

Detailed Solution for Test: Plant Growth & Development - 3 - Question 1

The living differentiated cells that have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as de differentiation.

Test: Plant Growth & Development - 3 - Question 2

Exponential growth is dependent on

Detailed Solution for Test: Plant Growth & Development - 3 - Question 2

Exponential growth is dependent on initial size, rate of growth and time interval. Lt= L0+ rt.

Test: Plant Growth & Development - 3 - Question 3

Which of the following gibberellic acid is used for malting process in brewing industry?

Detailed Solution for Test: Plant Growth & Development - 3 - Question 3

GA3 is used to speed up the malting process in brewingindustry.

Test: Plant Growth & Development - 3 - Question 4

You forget to add Cytokinin the culture medium, there will be very little growth as Cytokinin is essential for

Detailed Solution for Test: Plant Growth & Development - 3 - Question 4

Cytokinin is added to culture medium to induce cell division and cell differentiation. If cytokine is not added to culture medium, there will be very little growth in culture.

Test: Plant Growth & Development - 3 - Question 5

Measurement and the comparison of total growth per unit time is called

Detailed Solution for Test: Plant Growth & Development - 3 - Question 5

The measurement and the comparison of total growth per unit time is called the absolute growth rate.

Test: Plant Growth & Development - 3 - Question 6

Which one is not a phase of Growth

Detailed Solution for Test: Plant Growth & Development - 3 - Question 6

Growth phase consists of leg phase, exponential phase and stable phase. It do not consist of linear phase.

Test: Plant Growth & Development - 3 - Question 7

Which of the following hormone is used to kill dicotyledonous weeds?

Detailed Solution for Test: Plant Growth & Development - 3 - Question 7

2, 4 D are widely used as herbicides. It is widely used to kill dicotyledonous weeds, does not affect mature monocotyledonous plants.

Test: Plant Growth & Development - 3 - Question 8

A student culture a callus from the tobacco pith in sterilized minimal nutritive medium but add more Cytokinin than Auxin. What would develop first from callus

Detailed Solution for Test: Plant Growth & Development - 3 - Question 8

The callus consists of undifferentiated tumor like cells. If the concentration of auxin with respect to that of cytokinin ratio is changed, the cells of the callus undergo transformation to produce organs like roots or shoots. If the level of cytokinin is high as compared to the auxin level, the callus cells undergo transformation and produces shoots.

High concentrations of cytokinin generally inhibit or delay root formation and also prevent root growth. High levels of cytokinin usually causes many small shoots to be produced.

Hence, shoot would develop first from the callus.

Test: Plant Growth & Development - 3 - Question 9

Which of the following events are arranged in correct order?

Detailed Solution for Test: Plant Growth & Development - 3 - Question 9

Growth, differentiation and development are very closely relatedevents in the life of a plant. Broadly, development is considered as thesum of growth and differentiation.

Test: Plant Growth & Development - 3 - Question 10

The graphical representation of the total growth against time is called

Detailed Solution for Test: Plant Growth & Development - 3 - Question 10

Growth curve is the graphical representation of the total growth against time. It is also known as sigmoid curve.

Test: Plant Growth & Development - 3 - Question 11

Parthenocarpy can be induced to develop seedless fruit by application of

Detailed Solution for Test: Plant Growth & Development - 3 - Question 11

Auxins (IAA,IBA)also induce parthenocarpy,(Seed less fruits) e.g., in tomatoes.

Test: Plant Growth & Development - 3 - Question 12

In wheat field some broad-leaved weeds were seen by a farmer, which plant hormone would you suggest to get rid of the same?

Detailed Solution for Test: Plant Growth & Development - 3 - Question 12

Plant hormone 2 : 4-D and 2 : 4 :5 T have ability to kills the weeds in the crop field. Weeds are unwanted plants that grows along with crop plants and compete with crop for nutrient and water.

Test: Plant Growth & Development - 3 - Question 13

All changes that an organism goes through during its life cycle is called as

Detailed Solution for Test: Plant Growth & Development - 3 - Question 13

Development is a term that includes all changes that an organism goesthrough during its life cycle from germination of the seed to senescence.

Test: Plant Growth & Development - 3 - Question 14

If W1 is the final size, W0 is initial size, r is growth rate and t is time of growth than Exponential growth is represented by

Detailed Solution for Test: Plant Growth & Development - 3 - Question 14

Exponential growth is represented by initial size and growth rate and time. If W1 is the final size,W0 is the initial size, r is growth rate and t is the time of growth than exponential growth is W= W0.ert.

Test: Plant Growth & Development - 3 - Question 15

Identify the cytokinin given below

Detailed Solution for Test: Plant Growth & Development - 3 - Question 15

Cytokinin is of different types. The cytokinin shown above is of kinetin which promotes cell division. It was isolated by Miller and Skoog from autoclaved herring sperm DNA.

Test: Plant Growth & Development - 3 - Question 16

Auxin precursor for IAA is

Detailed Solution for Test: Plant Growth & Development - 3 - Question 16

The major precursor of Auxin is most likely the amino acid Tryptophan.

Test: Plant Growth & Development - 3 - Question 17

The phenomenon of heterophyll is an example of

Detailed Solution for Test: Plant Growth & Development - 3 - Question 17

Plants follow different pathways in response to environment or phasesof life to form different kinds of structures. This ability is called plasticity. This phenomenon of heterophylly is an example of plasticity.

Test: Plant Growth & Development - 3 - Question 18

Plant growth regulator that is used in delay in leaf senescence is

Detailed Solution for Test: Plant Growth & Development - 3 - Question 18

Cytokinins help overcome the apical dominance. They promotenutrient mobilisation which helps in the delay of leaf senescence.

Test: Plant Growth & Development - 3 - Question 19

Photoperiodism stimulus is perceived by

Detailed Solution for Test: Plant Growth & Development - 3 - Question 19

The response of plants to periods of day/night is termed photoperiodism. The site of perception of light/dark duration is the leaves.

Test: Plant Growth & Development - 3 - Question 20

Auxanometer is used to measure

Detailed Solution for Test: Plant Growth & Development - 3 - Question 20

Auxanometer is a devise used to measure growth in length of plant parts.

Test: Plant Growth & Development - 3 - Question 21

Which one prevents premature fall of fruit?

Detailed Solution for Test: Plant Growth & Development - 3 - Question 21

Auxins promote flowering e.g. in pineapples.They help to prevent fruit and leaf drop at early stages but promote theabscission of older mature leaves and fruits.

Test: Plant Growth & Development - 3 - Question 22

Kinetin was identified by

Detailed Solution for Test: Plant Growth & Development - 3 - Question 22

Skoog and Milleridentified and crystallised the cytokinesis promoting active substance that they termed kinetin.

Test: Plant Growth & Development - 3 - Question 23

Flowering in short day plants is stimulated by

Detailed Solution for Test: Plant Growth & Development - 3 - Question 23

Short day plants must be exposed to light for a period less than this critical duration before the flowering is initiated in them.

Test: Plant Growth & Development - 3 - Question 24

Maximum growth occurs in

Detailed Solution for Test: Plant Growth & Development - 3 - Question 24

In growth curve, maximum growth occurs in exponential phase of sigmoid curve. During this periods cells divide mitotically to increase length and girth of the plant

Test: Plant Growth & Development - 3 - Question 25

Natural cytokinins are synthesised in regions where rapid cell division occurs. Such regions are:

Detailed Solution for Test: Plant Growth & Development - 3 - Question 25

Answer : D

Solution :About 18 types of cytokinins have been discovered till now. Some of them are constituents of RNAS. Roots are considered as the major source of cytokinin synthesis, from roots, the cytokinins pass upwardly through xylem. Cytokinin synthesis also occurs in the areas where cell divisions takes place e.g., growing embryos and developing seeds, endosperm of seeds, young fruits, develpoing shoot buds, etc.

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