6. Tissues Science class 9 in English Medium ncert book solutions Chapter Review

Chapter Review:

• A group of cells having similar functions and similar structure is known as tissue. 

• The growth of plants occurs only in certain specific regions. This is because the dividing tissue, also known as meristematic tissue.

• The xylem carries water and minerals obtained from the soil to the plant.

• Phloem transports products of photosynthesis from the leaves where they are synthesized to other parts of the plant. 

• There are many small holes in the leaves of plants. These are called stomata.

• Parenchyma, collenchyma and sclerenchyma are three types of simple tissues.

• Xylem consist of :- (i) Tracheids (ii) Vessels (iii) Xylem parenchyma (iv) Xylem fibres. 

• Phloem made up of:- (i) Sieve tubes (ii) Companion cells (iii) Phloem fibre (iv) Phloem parenchyma.

• The covering or protective tissues in the animal body are epithelial tissues.

• Cilia are hair-like projections on the outer surfaces of epithelial cells.

• Plasma is called a fluid matrix of blood.

•  Blood and bones are connective tissues.

• Muscular tissue is responsible for movement of our body.

•  Muscles present in our limbs move when we want them to, and stop when we so decide. Such muscles are called voluntary muscles.

• The movement of food in the alimentary canal or the contraction and relaxation of blood vessels are involuntary movements. Such muscles are known as involuntary muscles.

• The muscles of the heart show rhythmic contraction and relaxation throughout life. These involuntary muscles are called cardiac muscles.

• Nervous tissue is made of neurons that receive and conduct impulses.

• Two bones can be connected to each other by another type of connective tissue called the ligamen.

• Striated, unstriated and cardiac are three types of muscle tissues.