Choose the correct answer from the options given below
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To remember this quickly:
*Tribulus terrestris* (Gokharu) is well known for its sharp, tire-puncturing spines.
*Xanthium* is famous for its velcro-like hooked burs.
Step 1: Understanding the Concept:
Weeds have evolved diverse morpho-anatomical adaptations to aid in seed dispersal and survival.
Many weeds use zoochory, where their seeds have physical structures that cling to the fur of animals or the clothing of humans to disperse over long distances. Step 2: Detailed Explanation:
Let us analyze each weed and its characteristic botanical feature:
1.*Xanthium strumarium* (Cocklebur) (A): The fruit of this weed is enclosed in a hard, woody burs covered with numerous hooked spines (IV).
These hooks easily catch onto passing animals or clothing to facilitate seed dispersal.
Thus, (A) matches with (IV).
2.*Tribulus terrestris* (Puncture vine/Gokharu) (B): The fruit consists of woody nutlets armed with 2 to 4 very sharp, rigid spines (I).
These spines can puncture bicycle tires or the hooves of livestock.
Thus, (B) matches with (I).
3.*Achyranthes aspera* (Chaff-flower/Apamarga) (C): The inflorescence features dry, papery, and persistent scarious bracts (II) with pointed tips that cling to fur and clothing.
Thus, (C) matches with (II).
4.*Boerhavia repens* (Punarnava) (D): The small, club-shaped glandular fruits are covered with sticky glandular hairs or glands (III) that stick to animals.
Thus, (D) matches with (III).
Combining these matches:
\[
\text{(A)-(IV), (B)-(I), (C)-(II), (D)-(III)}
\] Step 2: Final Answer:
The correct matching sequence is (A) - (IV), (B) - (I), (C) - (II), (D) - (III).
