IX - BIOLOGY
Tissues - Extra Questions
Q.1 Name the muscular tissue that functions throughout life without fatigue.
Q.2 In desert plants, how does the rate of loss of water get reduced?
Q.3 Which animal tissue helps in repair of tissue and fills the space inside the organ?
Q.4 What minerals is the bone matrix rich in?
Q.5 What is responsible for increase in girth of the stem or root?
Q.6 What is lignin?
Q.7 Why are voluntary muscles also called skeletal muscles?
Answers
Answer:
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Explanation:
A-1 the muscular tissue that functions throughout life without fatigue is Cardiac muscles which are present in Heart .
A-2 Cuticle are protective, hydrophobic waxy covering produced by epidermal cells of leaves, young shoots and other aerial parts. It minimises the water loss through transpiration (with the help of stomata) and also reduces pathogen entry.
A-3 Areolar connective tissue is found between the skin and muscles, around blood vessels and nerves and in the bone marrow.
A-4 The matrix is hardened by the binding of inorganic mineral salt, calcium phosphate, in a chemical arrangement known as calcium hydroxylapatite.
A-5 Girth of the stem increases due to lateral meristematic tissues. They are found beneath the bark (called cork cambium) and in vascular bundles of dicot roots and stems (called vascular cambium) as thin layers. This increase in the diameter and girth of the plant is called secondary growth.
A-6 A complex organic polymer deposited in the cell walls of many plants, making them rigid and woody.
A-7 Voluntary muscles are also often called skeletal muscles (because all of the muscles attached to the skeleton are voluntary muscles) or striated muscles (because the muscle fibers make them look striated, or stripy).