Class 9 Science
Question 1: Define the term tissue.
Answer: A group of cells which is meant to perform a specific function is called tissue.
Question 2: How many types of elements together make up the xylem tissue? Name them.
Answer: Xylem is composed of these elements: tracheids, xylem vessel, xylem parenchyma and xylem fibre.
Question 3: How are simple tissues different from complex tissues in plants?
Answer: Simple tissues are composed of similar cells, while complex tissues are composed of different types of cells.
Question 4: Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall.
|Cell wall is thin.||Cells wall is thickened at corners.||Cell wall is thickened all around.|
Question 5: What are the functions of the stomata?
Answer: Functions of stomata are as follows: exchange of gase, and transpiration
Question 6: Diagrammatically show the difference between the three types of muscle fibres.
Question 7: What is the specific function of the cardiac muscle?
Answer: Cardiac muscles facilitate contraction and relaxation of heart; which results in pumping action of the heart.
Question 8: Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
|Striated Muscles||Unstriated Muscles||Cardiac Muscles|
|Unbranched fibres; with striations.||Unbranched fibres; with striations.||Branched fibres with striations.|
|Present in voluntary organs.||Present in involuntary organs.||Present in the heart.|
Question 9: Draw a labelled diagram of a neuron.
Question 10: Name the following:
Answer: (a)Simple epithelium, (b) Tendon, (c) Phloem, (d) Adipose tissue, (e) Blood, (f) Nervous tissue
Question 11: Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle.
Answer: Skin: Epithelium, Bark of tree: Epidermis, Bone: Connective tissue, Lining of kidney tubule: Cuboidal Epithelium, Vascular bundle: Complex plant tissue
Question 12: Name the regions in which parenchyma tissue is present.
Answer: Parenchyma is present in mesophyll of leaves, fruits, flowers and young stem.
Question 13: What is the role of epidermis in plants?
Answer: Epidermis in plants provides protective covering to the underlying tissues. In xerophytes, epidermis has a waxy coating which prevents water loss.
Question 14: How does the cork act as a protective tissue?
Answer: Cork forms an impervious layer over underlying tissues. Cork prevents entry of water to the underlying tissue.
Question 1: What is a tissue?
Answer: A group of cells which is meant to serve a special function is called tissue.
Question 2: What is the utility of tissues in multicellular organisms?
Answer: Tissues facilitate division of labour. Different tissues are responsible for different functions, which is important for the functioning of a multicellular organism.
Question 3: Name types of simple tissues.
Answer: Simple tissues are as follows:
Question 4: Where is apical meristem found?
Answer: Apical meristem is found at root apex, shoot apex, leaf buds, etc.
Question 5: Which tissue makes up the husk of coconut?
Question 6: What are the constituents of phloem?
Answer: Phloem is composed of sieve tubes, companion cells, phloem fibres and phloem parenchyma.
Question 7: Name the tissue responsible for movement in our body.
Answer: Muscular tissue
Question 8: What does a neuron look like?
Answer: Neuron looks like a star-shaped cell with a tail.
Question 9: Give three features of cardiac muscle.
Answer: Three features of cardiac muscle are as follows:
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