Q1
Assertion (A): Xylem is a complex tissue.
Reason (R): It is made up of more than one type of cell, such as tracheids, vessels, xylem parenchyma and xylem fibres.
Choose the correct option:
Reason (R): It is made up of more than one type of cell, such as tracheids, vessels, xylem parenchyma and xylem fibres.
Choose the correct option:
📝 SolutionXylem is called a complex tissue because it consists of several types of cells working together. R correctly explains why A is true.
Q2
Neurons are the structural and functional unit of:
📝 SolutionNeurons (nerve cells) are the structural and functional units of nervous tissue, which conducts impulses.
Q3
Which epithelial tissue lines the blood vessels and allows easy diffusion?
📝 SolutionSquamous epithelium is thin and flat, allowing easy diffusion of substances, and lines blood vessels and alveoli.
Q4
Adipose tissue in animals mainly functions to:
📝 SolutionAdipose tissue is specialised connective tissue that stores fat, acting as an energy reserve and insulator.
Q5
Assertion (A): Involuntary muscles are found in the walls of internal organs like the stomach and intestine.
Reason (R): These muscles are not under conscious control.
Choose the correct option:
Reason (R): These muscles are not under conscious control.
Choose the correct option:
📝 SolutionSmooth (involuntary) muscles line internal organs and work automatically without conscious control, which is exactly why they are called involuntary. R correctly explains A.
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Class 9 · Science
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