NCERT Solutions for Class 11 Biology Chapter 7 Structural Organisation in Animals to download in PDF form free or Study online without downloading. NCERT Solutions based on latest CBSE Books are also available to download.
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Structural Organisation in Animals: Solutions
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11 Biology Chapter 7 Question Answers
Important Notes on Structural Organisation in Animals
Three Types of Cell junctions
- Tight junctions: Plasma membranes of adjacent cells are fused at intervals. They help to stop substances from leaking across a tissue.
- Adhering junctions: Perform cementing function to keep neighbouring cells together.
- Gap junction: Facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells for rapid transfer of ions, small molecules and sometimes big molecules.
Specialised Connective Tissues
- Cartilage: made up of chondrocytes and collagen fibres; inter cellular material is solid and resists compression. Present in tip of nose outer ear joints, etc.
- Bones: Ground substance is rich in calcium salts and collagen fibres Osteocytes are present in lacunae. Bones support and protect softer tissues and organs. They interact with skeletal muscles to bring about movements. Bone marrow in some bones is the site of blood cell formation.
- Blood: Fluid connective tissue, consists of plasma and blood cells.
Dense Connective Tissue
- Fibres and fibroblasts are compactly packed.
- Dense Regular: Collagen fibres present in rows. Tendons attach skeletal muscle to bone. Ligaments attach bone to bone.
- Dense Irregular: Has collagen fibres and fibroblasts oriented differently. This tissue is present in the skin.
Short Answer Questions (1 mark each)
- Name the tissue which contains Haversian canals.
- Mention two special properties of nervous tissues.
- Name the large cells present in adipose tissue.
- Name the cells responsible for clotting of blood.
- What are exocrine glands?
- Where are RBC’s formed?
- A muscular fibre having no striations and tapers at both ends. Name it.
- Mammalian bone.
- Excitability and conductivity.
- Blood platelets.
- Glands which discharge their secretions into ducts.
- Bone narrow
- Smooth or non-striated muscle fibre.