Plant growth and development NEET notes pdf download

Plant growth and development NEET notes pdf download

Plant growth and development NEET notes pdf download

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Plant growth and development NEET notes pdf download:- Today we are sharing Plant growth and development NEET notes pdf download. This Plant growth and development NEET notes pdf download for upcoming examination like NEET, JEE, NTPC, SSC CGL, LIC, REET, UPPSC, MPTET, DSSSB, RPSC, UPSC, DRDO, DDA, AAI, SSC GD, ALL STATE PCS EXAM. This Plant growth and development NEET notes pdf download and important questions Plant growth and development NEET notes pdf download which Will be helpful for you in preparing for the exams. Keep watching the updates on this website every day, here the notes and questions are updated daily, if you need notes/questions on any subject or topic, then you can contact our team. The team is looking forward to supporting you.

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Most Important Plant growth and development Question

Q 1. Fruit and leaf drop at early stages can be prevented by the application of

(NEET 2017)

A. cytokinins

B. ethylene

C. gibberellic acid

D. auxins

Q 2. The Avena curvature is used for bioassay of (NEET – I 2016)

A. Ethylene



D. GA3

Q 3. You are given a 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 roots? (NEET – II 2016)

A. Gibberellin and abscisic acid

B. auxin and abscisic acid

C. Auxin and cytokinin

D. IAA and gibberellin

Q 4. 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. Of what significance is this experiment? (2014)

A. it demonstrated polar movement of auxins

B. it supports the hypothesis that IAA is auxin

C. it is the basis for the quantitative determination of small amounts of growth-promoting substances

D. it made possible the isolation and exact identification of auxin

Q 5. During seed germination, its stored food is mobilized by (NEET 2013)

A. ethylene


C. cytokinin

D. gibberellin

Q 6. 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 describe them? (2014)

A. Defoliated

B. Etiolated

C. Embolised

D. Mutated

Q 7. The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of (NEET 2013)

A. NAA, 2, 4-D

B. phenylacetic acid


D. Cytokinin

Q 8. Which one of the following generally acts as an antagonist to gibberellins?

(Mains 2012)



C. Ethylene

D. Zeatin

Q 9. Coiling of garden pea tendrils around any support is an example of (2010)

A. thermotaxis

B. thigmotaxis

C. thigmonasty

D. thigmotropism

Q 10. Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, it is indicated in (2008)

A. leaf abscission

B. vessels and tracheid differentiation

C. floral parts

D. annual plants

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Most Important Plant growth and development Question

Q.1. Fill up:
a) A stage of growth that is the rapid and maximum is _________
b) ________ present in the apical bud in more numbers causes apical dominance as displayed in dicotyledonous plants.
c) Sites of photoperiodic perception in vegetative plants are _______
A.1. a) Log phase of an S-curve/Exponential b) IAA/Auxin c) Leaves.

Q.2. List the PGS (Plant growth substances) that needs to be used to have practical applications in the following:
a) Improve yield of sugarcane
b) Increase lateral shoot growth
c) The basis for the sprouting of potato tuber
d) Hinder seed germinationA.2. a) Gibberellin/Gibberellic acid b) Cytokinin c) Ethylene d) Abscisic acid

Q.3. List three physiological processes in plants that are affected by light.
A.3. Photosynthesis, phototropism, and photoperiodism.

Q.4. a) Write two functions of the phytohormone – Gibberellins
b) The seedling disease in rice caused by Gibberellin is due to which feature of it?
A.4. a) It is utilized to accelerate the malting phenomena in brewing industries. They facilitate bolting in cabbages, beetroot and several plants with rosette habitat. b) Internode elongation.

Q.5. Name the plant growth regulator that needs to be applied to improve the number of female flowers in a cucumber plant field.
A.5. Ethylene(C2H4).

Q.6. Where in plants are the below hormones manufactured?
a) IAA
B) Gibberellins
c) Cytokinins
A.6. a) Apical buds and shoot tips b) Young leaves and root tips c) Root tips (meristematic zones).

Q.7.List out the Factors Affecting Plant Growth?

A.7. The important factors affecting the growth of plants include:

Soil Nutrients.
Plant Growth Regulators.
Q.8.What is Differentiation?

A.8. Differentiation is defined as the process in which a cell changes from one cell type to another.

Q.9. What is Cell Maturation?

A.9. Maturation is defined as the process of enlarging cells, which acquire a definite shape to achieve their specific functions.

Q.10.What is Cell Enlargement?

A.10. Enlargement is defined as the process in which the size of the cells, tissues and organs increases by the formation of protoplasm, absorption of water, developing vacuoles, and addition of cell walls to make it thicker and permanent.

Q.1. Write the structural features of
a) Meristematic cells near the root tip
b) The cells in the elongation zone of the root
A.1. a) They are characterized by the following:

Big conspicuous nucleus
Rich protoplasm
The cell wall is cellulosic and thin – basic in nature
Less number of vacuoles
Large numbers of mitochondria
Plentiful plasmodesmata
b) Cells in the elongation zone are defined by:

Extended dimension
Increased vacuolation
New cellulosic cell walls are collected

Q.2. Is there a difference in the growth pattern of plants and animals? Do all parts of the plant grow endlessly? List the regions of the plant that can grow endlessly, if no.

Ans. Yes, they differ. Plant growth is different as plants have the potential to grow indefinitely during their lifetime. They exhibit this property because of the presence of meristems at certain parts of the plant body. These cells of the meristems have the ability of division and grow constantly. The plant body is made up by the cells which lose the capacity to divide. The growth form, where cells are constantly added to the body of the plant through the action of meristems is referred to as the open form of growth.

Q.3. Explain the following with examples from various plant tissues
a) Differentiation
b) De-differentiation
c) Redifferentiation


a) Differentiation – It is permanent in structure, size, function, and composition of cells, tissues or organs. For instance, meristematic tissues give rise to new cells that mature and get differentiated into special tissue or plant organ. For example – formation of treachery element results in the loss of cell protoplasm. To carry water at a stretch under extreme tension, they develop an elastic, strong, lignocellulosic secondary cell wall.

b) De-differentiation – Under certain conditions, the cells that have dropped the capability to divide can regain the capacity, this process is referred to as de-differentiation. For example – the development of meristems – the cork cambium from completely transformed parenchyma cells.

c) Re-differentiation – During de-differentiation, before-mentioned tissues/meristems after division generate cells that lose the ability to divide once more but mature to take up certain functions. They get re-differentiated. Example – secondary cortex.

Q.4. Why is it difficult to designate any effect to a single hormone during experimentation?
A.4. Several hormones have an antagonistic and synergistic impact with each other. Hence it becomes difficult.

Q.5. Where are plant hormones formed? How are the hormones passed to the specific site of activity?

Ans. The plant hormones are produced by several tissues like the root tips, shoot tips, leaves, meristematic tissues, and apical buds, etc. The presence of vascular tissues like phloem and xylem help in the translocation of hormones to sites of activity.

Q.6. What are Plant growth regulators?

Ans. Plant growth regulators also referred to as phytohormones or plant hormones. They are a group of organic compounds, which functions by controlling and modifying the physiological processes like the growth, development, and movement of plants.

Q.7. Which plant hormone is used to manipulate and stimulate the maturation of sugarcane crop?
Ans.Ethylene, the ripening hormone in plants helps in maturation of sugarcane crops by increasing the storage of sucrose in plants.

Q.8. What are the functions of Auxins in plant growth?
Ans. Auxins are one of the most important plant hormones. These plant hormones are generally produced at the tips of stems and roots. In all vascular plants, auxins play a vital role in:

Cell division.
Plant propagation.
Promoting flowering in plants.
Initiation of roots and stem cuttings.
Prevent premature dropping of fruits and leaves.

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