Which tissue provides mechanical support and flexibility to the growing parts of a plant?
A. Collenchyma
B. Xylem
C. Parenchyma
D. Sclerenchyma
Answer: Option A
Solution (By JKExamLibrary)
Collenchyma is a simple permanent tissue characterized by cells with thickened corners due to the deposition of cellulose and pectin. It provides mechanical support, tensile strength, and flexibility to the growing parts of the plant (like stems and petioles), allowing them to bend without breaking. Parenchyma is for storage, and sclerenchyma provides rigid support.
Explanation:
Simple permanent tissues (parenchyma, collenchyma, sclerenchyma) consist of a single cell type. Meristematic tissues are dividing and have thin walls; xylem/phloem are complex; epidermis is dermal.
Consider statements about lysosomes: 1. They are formed by Golgi apparatus. 2. They contain hydrolytic enzymes. 3. They are involved in autophagy. Which are correct?
Explanation:
Lysosomes are membrane-bound vesicles budded off from the Golgi apparatus. They contain powerful hydrolytic enzymes capable of breaking down proteins, lipids, and nucleic acids. They play a crucial role in autophagy, digesting worn-out cellular organelles. Thus, all three statements are biologically accurate and correct.
Explanation:
Karl Landsteiner discovered the ABO blood group system in 1901, for which he received the Nobel Prize. He also discovered the Rh factor with others.
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