Kinetin is a type of cytokinin, which is a class of plant hormones that promote cell division. Chemically, cytokinins like kinetin are derivatives of adenine, a purine base found in nucleic acids. This adenine base structure is crucial for its activity in stimulating cell division and growth.
B) ABA (Abscisic Acid) → Terpenes (I)
Abscisic Acid (ABA) is a plant hormone involved primarily in stress responses, such as drought tolerance, and in seed dormancy. ABA is derived from carotenoids, which are terpenoid compounds. Terpenes are a large and diverse class of organic compounds made from isoprene units, and ABA chemically belongs to this group.
C) GA3 (Gibberellic Acid) → Terpenes (I)
Gibberellic Acid (GA3) is a plant growth hormone that promotes stem elongation, seed germination, and flowering. It is a diterpenoid compound, meaning it is synthesized from four isoprene units, placing it in the terpene class. Hence, GA3 is chemically classified as a terpene.
Indole Acetic Acid (IAA) is the most common naturally occurring auxin, a hormone regulating plant growth and development. It contains an indole ring structure, which is a bicyclic structure consisting of a benzene ring fused to a pyrrole ring. This chemical nature classifies IAA as an indole compound.
Summary of Correct Matching:
A) Kinetin → IV) Adenine derivatives
B) ABA → I) Terpenes
C) GA3 → I) Terpenes
D) IAA → III) Indole compound
02
PYQ 2025
medium
botanyID: ap-eapce
Match the following
1
A-IV, B-I, C-III, D-II
2
A-IV, B-III, C-II, D-I
3
A-I, B-II, C-III, D-IV
4
A-I, B-III, C-II, D-IV
Official Solution
Correct Option:
(1)
Step 1: Match A) 2,4-D
\begin{itemize} \item 2,4-D (2,4-Dichlorophenoxyacetic acid) is a synthetic auxin. \item It is widely used as a selective herbicide, specifically designed to kill broadleaf (dicotyledonous) weeds without significantly harming monocot crops (like corn or wheat). It does this by causing uncontrolled growth. \item So, A IV. Dicotyledon weed killer.
\end{itemize} Step 2: Match B) GA\textsubscript{3}
\begin{itemize} \item GA\textsubscript{3} refers to Gibberellic acid, a prominent type of gibberellin, which is a plant hormone. \item Gibberellins promote stem elongation, seed germination, and fruit development. In the Brewing Industry, gibberellins are applied to barley grains during malting to stimulate the rapid synthesis and activity of -amylase, an enzyme that breaks down starch into sugars fermentable by yeast. \item So, B I. Brewing Industry.
\end{itemize} Step 3: Match C) Cytokinin
\begin{itemize} \item Cytokinins are plant hormones known for promoting cell division and delaying senescence (aging) processes in plants. \item A key function of cytokinins is to Delay of leaf senescence by mobilizing nutrients to the leaves and maintaining chlorophyll content. \item So, C III. Delay of leaf senescence.
\end{itemize} Step 4: Match D) Ethylene
\begin{itemize} \item Ethylene is a gaseous plant hormone primarily involved in fruit ripening, senescence, and abscission. \item Many fruits exhibit a phenomenon called "respiratory climacteric" during ripening, which is a sharp increase in respiration rate often induced by ethylene. \item So, D II. Respiratory climactic.
\end{itemize} Step 5: Formulate the complete match and check options
Based on the individual matches:
A IV
B I
C III
D II Let's check this sequence with the given options:
% Option
(1) A-IV, B-I, C-III, D-II (Matches our derived sequence)
% Option
(2) A-IV, B-III, C-II, D-I (Incorrect)
% Option
(3) A-I, B-II, C-III, D-IV (Incorrect)
% Option
(4) A-I, B-III, C-II, D-IV (Incorrect) Therefore, Option (1) is the correct answer.
About Plant Growth Regulators - AP-EAPCET
Plant Growth Regulators is a vital chapter for AP-EAPCET aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
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