Physiology and Biochemistry-Growth Substances [IFS (Forest Services) Botany]: Questions 1 - 8 of 10

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Question 1

Appeared in Year: 2014

Describe in Detail Subjective▾

Write brief notes on the following in about 150 words each: Allelopathy (Paper 2, Section B)

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Explanation

Alleopathy

  • Allelopathy is the suppression of growth of one plant species by another or same species due to the release of toxic substances.
  • Allelopathy is a biological phenomenon where one plant inhibits the growth of another.
  • Through the release of allelochemicals, certain plants can greatly affect the growth of other plants either in a good or bad w…

… (530 more words, 8 figures) …

Question 2

Appeared in Year: 2017

Describe in Detail Subjective▾

Describe the role of phytohormones in agri- horticulture.

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Explanation

Different Role of Different Phytohormone in Agri-Horticulture

Auxin

  • Propagation
  • Stimulation of fruit set
  • Chemical thinning
  • Prevent fruit drop
  • Herbicidal action

Gibberellins

  • Increase fruit size in grape.
  • Stimulate fruit set.
  • Effect fruit ripening.
  • Increase yield in sugarcane.
  • Malting of barley.
  • Controlling flower bud production.
  • Overcome environmental constraints…

… (163 more words) …

Question 3

Appeared in Year: 2017

Describe in Detail Subjective▾

Allelopathy

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Explanation

Alleopathy

  • It is a biological phenomenon. In which a plant or organism produces biochemical that influence the germination growth, survival and reproduction of other organism near them.
  • These biochemical can be beneficial or have negative effect on other organism and plant community. Alleochemicals are type of secondary metabolites and the alleochemi…

… (211 more words) …

Question 4

Appeared in Year: 2020 (IAS)

Describe in Detail Subjective▾

Write note on: Ethylene as a volatile hormone.

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Explanation

  • It is a gaseous and hence also volatile hormone that stimulates transverse or isodiametric growth.
  • It retards the longitudinal one.
  • Ripe fruit can trigger early ripening of other fruits present near them.
  • For example, Cousins in 1910 found that ripe oranges produced a volatile substance that hastened ripening of unripe bananas around them.
  • R. Gane with…

… (242 more words) …

Question 5

Appeared in Year: 2019

Describe in Detail Subjective▾

How can longitudinal growth of the seedlings is manipulated by plant growth regulators?

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Explanation

  • Longitudinal growth of seedlings is regulated by growth promoters and inhibitors.
  • Each plant hormone evokes many different responses.
  • Hormones are internally secreted chemicals in plants that are used for regulating the plants growth.
  • Hormones which have effect on overall growth of plant are
    • Auxins
    • Gibberellins
    • Cytokinins
    • Abscisic acid
    • Ethylene
  • Plant hormon…

… (284 more words) …

Question 6

Appeared in Year: 2021 (IAS)

Describe in Detail Subjective▾

Write short notes on the following:

Role of growth substances in agri-horticulture

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Explanation

Plant growth regulators are classified into five kinds. The kinds are as follows:

  • Auxins
  • Gibberellins
  • Cytokinins
  • Ethylene
  • Abscissic Acid.

Auxins have several applications. They have been utilized in horticulture and agriculture for almost 50 years. They aid in the establishment of roots in stem cuttings, a common method of plant multiplication. Auxins, f…

… (674 more words) …

Question 7

Appeared in Year: 2019 (IAS)

Describe in Detail Subjective▾

Write explanatory notes with examples on the following:

Name specific physiological responses on the basis of which IAA, GAs and Kinetin can be identified.

(Paper 2)

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Explanation

Kinetin

Inducing cell division in the presence of adequate auxin (IAA) is one of the most important biological actions of kinetin on plants, notably in tobacco pith callus, carrot root tissue, soybean cotyledon, and pea callus. The impact of kinetin on promoting or beginning the production of buds has also been seen in leaf cuttings of Saintpaulia i…

… (358 more words) …

Question 8

Appeared in Year: 2022

Describe in Detail Subjective▾

How do auxins control the growth of axillary buds? Explain add a note on the applications of auxins in agriculture. (Paper 2)

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Explanation

Apical dominance is the situation in which the presence of an apical bud prevents the growth of neighboring lateral buds. The lateral buds develop after the apical bud is removed. This results in thick, bushy growth. The phenomena are commonly exploited in the tea picking and hedge building industries. By releasing auxins, the apical bud restricts …

… (766 more words) …