Give reasons for the following.
1. Permanent tissues do not divide.
2. Chlorenchyma cells can make food.
3. Bones are hard and strong.
4. Blood is a fluid connective tissue
5. Cardiac muscles work tirelessly.
Answers
Answer:
1) ans--Tissues that have become mature and do not have the ability to divide further are called permanent tissues. Permanent tissues are made up of cells that do not undergo cell division. The cells in these tissues are modified to perform some specific functions.
2) ans--In leaves, they form two layers of mesophyll cells immediately beneath the epidermis of the leaf, that are responsible for photosynthesis and the exchange of gases. These layers are called the palisade parenchyma and spongy mesophyll. ... Chlorenchyma cells carry out photosynthesis and manufacture
3)ans--Bones are made up of a framework of a protein called collagen , with a mineral called calcium phosphate that makes the framework hard and strong. Bones store calcium and release some into the bloodstream when it's needed by other parts of the body.
4)ans--Blood and lymph are fluid connective tissues. Cells circulate in a liquid extracellular matrix. The formed elements circulating in blood are all derived from hematopoietic stem cells located in bone marrow Erythrocytes, red blood cells, transport oxygen and some carbon dioxide.
5)ans--Your heart, meanwhile, is made of “cardiac muscle.” ... Cardiac muscle resists fatigue so well because it's got more mitochondria than skeletal muscle. With so many power plants at its disposal, the heart doesn't need to stop and chill out. It also has a steady supply of blood bringing it oxygen and nutrients.
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