The diagrams show a section through a root and a section through a stem.
In which tissues are amino acids transported?
A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 2 and 4
▶️ Answer/Explanation
Ans: A
Amino acids are transported through the phloem, which is responsible for the translocation of organic nutrients like sugars and amino acids.
- In the root, 1 represents the phloem.
- In the stem, 3 represents the phloem.
Xylem (tissues 2 and 4) transports water and minerals, not organic compounds. Therefore, the correct answer is A (1 and 3).
Which structure or substance is found in a plant root?
A) dentine
B) platelet
C) ventricle
D) xylem
▶️ Answer/Explanation
Ans: D
Xylem (D) is the correct answer because it is a specialized tissue in plants responsible for transporting water and minerals from the roots to the rest of the plant. Dentine (A) is found in teeth, platelets (B) are blood components, and ventricles (C) are heart chambers, none of which are present in plant roots.
Since the question asks for a structure found in plant roots, the only valid option is D (Xylem).