Question:
Given below are two statements:
Statement (I) : Dwarfing interstocks in apple are used to avoid the undesirable root system of a dwarfing rootstock
Statement (II) : Mallus Sikimmensis is largely used as interstock for the said purpose
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements:
Statement (I) : Dwarfing interstocks in apple are used to avoid the undesirable root system of a dwarfing rootstock
Statement (II) : Mallus Sikimmensis is largely used as interstock for the said purpose
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (I) : Dwarfing interstocks in apple are used to avoid the undesirable root system of a dwarfing rootstock
Statement (II) : Mallus Sikimmensis is largely used as interstock for the said purpose
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
A three-part graft combination is written as:
\[ \text{Rootstock} \longleftrightarrow \text{Interstock} \longleftrightarrow \text{Scion} \]
This technique is a highly effective way to grow high-density orchards on soils where weak-rooted dwarfing stocks would otherwise fail.
\[ \text{Rootstock} \longleftrightarrow \text{Interstock} \longleftrightarrow \text{Scion} \]
This technique is a highly effective way to grow high-density orchards on soils where weak-rooted dwarfing stocks would otherwise fail.
Updated On: Jul 23, 2026
- Both Statement (I) and Statement (II) are true.
- Both Statement (I) and Statement (II) are false.
- Statement (I) is true but Statement (II) is false.
- Statement (I) is false but Statement (II) is true.
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
This question focuses on apple propagation using a three-part graft combination: rootstock, interstock, and scion.
Interstocks are used to combine the desirable traits of two different rootstocks, such as combining the strong root system of a vigorous stock with the dwarfing effect of a dwarfing stock.
Step 2: Detailed Explanation:
Let us analyze each statement individually:
Statement (I): "Dwarfing interstocks in apple are used to avoid the undesirable root system of a dwarfing rootstock"
This statement is correct.
Dwarfing rootstocks (like M.9 or M.27) have highly effective dwarfing properties, but they often have weak, brittle root systems with poor anchorage, requiring permanent trellis support.
To avoid this issue, growers use a vigorous, well-anchored rootstock (such as MM.111) at the base.
They then graft a short piece of a dwarfing stock (the interstock) onto it, and finally graft the desired fruit variety (scion) on top.
This creates a tree that is both naturally dwarfed and firmly anchored in the soil.
Statement (II): "Mallus Sikimmensis is largely used as interstock for the said purpose"
This statement is incorrect.
Malus sikkimensis (commonly misspelled as Mallus Sikimmensis) is an apomictic, semi-vigorous apple rootstock known for its resistance to woolly apple aphid.
It is not used as a dwarfing interstock.
Instead, dwarfing interstocks are typically chosen from dedicated dwarfing clones like M.9, M.27, or Budagovsky 9 (B.9).
Step 3: Final Answer:
Statement (I) is true, but Statement (II) is false.
This corresponds to Option (C).
This question focuses on apple propagation using a three-part graft combination: rootstock, interstock, and scion.
Interstocks are used to combine the desirable traits of two different rootstocks, such as combining the strong root system of a vigorous stock with the dwarfing effect of a dwarfing stock.
Step 2: Detailed Explanation:
Let us analyze each statement individually:
Statement (I): "Dwarfing interstocks in apple are used to avoid the undesirable root system of a dwarfing rootstock"
This statement is correct.
Dwarfing rootstocks (like M.9 or M.27) have highly effective dwarfing properties, but they often have weak, brittle root systems with poor anchorage, requiring permanent trellis support.
To avoid this issue, growers use a vigorous, well-anchored rootstock (such as MM.111) at the base.
They then graft a short piece of a dwarfing stock (the interstock) onto it, and finally graft the desired fruit variety (scion) on top.
This creates a tree that is both naturally dwarfed and firmly anchored in the soil.
Statement (II): "Mallus Sikimmensis is largely used as interstock for the said purpose"
This statement is incorrect.
Malus sikkimensis (commonly misspelled as Mallus Sikimmensis) is an apomictic, semi-vigorous apple rootstock known for its resistance to woolly apple aphid.
It is not used as a dwarfing interstock.
Instead, dwarfing interstocks are typically chosen from dedicated dwarfing clones like M.9, M.27, or Budagovsky 9 (B.9).
Step 3: Final Answer:
Statement (I) is true, but Statement (II) is false.
This corresponds to Option (C).
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