Climacteric is
- a phenomenon related to fruit ripening
- the condition of a plant when all its fruits are almost ripe
- the condition of a plant when most of its leaves have turned yellow
- none of the above
The Correct Option is A
Solution and Explanation
The correct option is(A): a phenomenon related to fruit ripening.
It is a phenomenon that is related to fruit ripening. Climacteric is the reproductive stage that marks the critical period of ripening of fruits, by increasing the production of ethylene. Ethylene is the plant hormone that plays a role in the ripening process. There is a rapid increase in the rate of respiration and other changes like colour, flavour, aroma etc.
Top Questions on Plant Growth Regulators
- Which plant hormone is mainly responsible for apical dominance?
- GATE AG - 2026
- Agriculture
- Plant Growth Regulators
- Describe physiological effects and applications of ethylene.
- Maharashtra Class XII - 2025
- Biology
- Plant Growth Regulators
- What is the full form of IAA?
- Maharashtra Class XII - 2025
- Biology
- Plant Growth Regulators
- Identify the growth hormone in plants which causes inhibitory effect.
- Maharashtra Class XII - 2025
- Biology
- Plant Growth Regulators
- Match the following
List - I List - II A) Kinetin IV) Adenine derivatives B) ABA (Abscisic Acid) I) Terpenes C) GA3 (Gibberellic Acid) I) Terpenes D) IAA (Indole Acetic Acid) III) Indole compound - AP EAPCET - 2025
- Botany
- Plant Growth Regulators
Questions Asked in WBJEE exam
What are the charges stored in the \( 1\,\mu\text{F} \) and \( 2\,\mu\text{F} \) capacitors in the circuit once current becomes steady?
- WBJEE - 2026
- Capacitors and Capacitance
Which one among the following compounds will most readily be dehydrated under acidic condition?
- WBJEE - 2026
- Organic Reactions
Manufacturers supply a zener diode with zener voltage \( V_z=5.6\,\text{V} \) and maximum power dissipation \( P_{\max}=\frac14\,\text{W} \). This zener diode is used in the circuit shown. Calculate the minimum value of the resistance \( R_s \) so that the zener diode will not burn when the input voltage is \( V_{in}=10\,\text{V} \).
- WBJEE - 2026
- Zener Diodes
Two charges \( +q \) and \( -q \) are placed at points \( A \) and \( B \) respectively which are at a distance \( 2L \) apart. \( C \) is the midpoint of \( AB \). The work done in moving a charge \( +Q \) along the semicircle CSD (\( W_1 \)) and along the line CBD (\( W_2 \)) are
- WBJEE - 2026
- electrostatic potential and capacitance
A piece of granite floats at the interface of mercury and water. If the densities of granite, water and mercury are \( \rho, \rho_1, \rho_2 \) respectively, the ratio of volume of granite in water to that in mercury is
- WBJEE - 2026
- Buoyancy and Floatation
Concepts Used:
Plant Growth Regulators
What is a plant growth regulator?
Plant growth regulators (PGRs) are chemicals used to modify plant growth such as increasing branching, suppressing shoot growth, increasing return bloom, removing excess fruit, or altering fruit maturity.
Types of Plant Growth:
There are the following types of plant growth.
- Primary and Secondary Growth: The growth of a plant is termed primary when the same happens through the mitotic division of the meristematic cells which are present at the root and the shoot of the plants.
Whereas, the secondary growth in a plant takes place through the division of the secondary meristem, which, in turn increases the diameter of the body of the plants.
- Primary and Secondary Plant Growth
- Unlimited Growth
- Limited Growth
- Vegetative Growth
- Reproductive Growth
The five groups of plant growth regulators used in fruit crops include:
- Auxins: Auxins are one of the most important plant hormones. The chief naturally occurring auxin is indole-3 acetic acid – IAA and other related compounds.
- Gibberellins: Gibberellins are an extensive chemical family based on the ent-gibberellane structure. The first gibberellin to be discovered was gibberellic acid. Now there are more than 100 types of gibberellins.
- Cytokinins: These are produced in the regions where cell division occurs; mostly in the roots and shoots. They help in the production of new leaves, lateral shoot growth, chloroplasts in leaves etc.
- Absicisic Acid: Absicsic acid controls the dormancy of buds and seeds, inhibits shoot growth and is involved in regulating water loss from plants.
- Ethylene: Ethylene is a simple, gaseous plant growth regulator, synthesised by most of the plant organs includes ripening fruits and ageing tissues.