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CNMS ICSE - 7 Std
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Chapter: 01. Tissues

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What is organisation in living organisms?
Organisation is the manner in which smaller units of any structure or system are arranged into larger units in a hierarchical fashion.
Define the term ‘tissue’.
A tissue is a group of structurally similar cells that perform a similar function.
Which level of organisation is represented by simple multicellular organisms like sponges?
Simple multicellular organisms like sponges represent the cellular level of organisation.
What is the purpose of division of labour in multicellular organisms?
The purpose of division of labour is to help multicellular organisms carry out different functions more efficiently and in a coordinated fashion.
Name the four levels of organization within an organism from lowest to highest.
The four levels of organization within an organism are the cellular level, tissue level, organ level, and organ-system level.
What is an ecosystem?
An ecosystem is a system formed by the interaction of the members of a biotic community with the abiotic components of their environment.
What are the main characteristics of meristematic tissues?
Meristematic tissues consist of actively dividing, small, oval, thin-walled young cells with large central nuclei and absent or very small vacuoles.
What is the main function of the apical meristem?
The main function of the apical meristem is to help plants grow in length at growing points like roots, shoots, and branches.
How do permanent tissues differ from meristematic tissues regarding cell division?
Unlike meristematic cells which keep on dividing, the cells of permanent tissues are mature and differentiated and do not divide.
Where is collenchyma tissue typically located in herbaceous dicot plants?
Collenchyma tissue is located below the epidermis in the leaves, stem, and petioles of herbaceous dicot plants.
Why is xylem also referred to as wood?
Xylem is also called wood because the old xylem forms the wood in trees from which furniture is made.
Name the four types of cells that form phloem tissue.
Phloem tissue is formed of sieve tubes, companion cells, phloem fibres, and phloem parenchyma.
What is the role of glandular epithelium in the stomach and intestine?
Glandular epithelium consists of modified columnar epithelial cells that secrete digestive juices.
Contrast the structural and functional differences between tendons and ligaments.
Tendons are strong, nonelastic fibrous structures that connect skeletal muscles to bones, whereas ligaments are strong, elastic fibrous structures that connect two bones together at joints.
Where in the human body can cartilage be found?
Cartilage is found supporting the wall of the windpipe, the nasal septum, the external ear (pinna), and between the bones at joints.
Why are white blood cells referred to as the ‘soldiers of the body’?
White blood cells are called the ‘soldiers of the body’ because they fight and kill germs that enter the body.
What is lymph?
Lymph is filtered blood, which is straw-coloured plasma without red blood cells and blood proteins, that helps in exchange of substances and protects the body against infection.
What are the three main types of muscular tissues?
The three main types of muscular tissues are striated (voluntary), nonstriated (involuntary), and cardiac muscles.
Name the three main structural parts of a neuron.
A neuron consists of three main parts which are the cell body (cyton), a long cylindrical process (axon), and short processes arising from the cyton (dendrons).
What is the function of dendrites in a nervous tissue?
Dendrites receive nerve impulses or messages from the axons of adjacent neurons through synapses and transfer them to the cyton.
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