Wednesday , June 29 2022

NCERT 9th Class (CBSE) Science: Tissues

Question: Name the tissues responsible for the movement of the body.

Answer: Muscle tissue and nervous tissue

Question: How does neuron look like?

Answer: A neuron is the unit cell of nervous tissue. It is a thread-like structure with cell body and axon.

Question: Name the types of simple tissues.

Answer: (a) Parenchyma (b) Collenchyma (c) Sclerenchyma

Question: Name the types of complex tissues.

Answer: Xylem and Phloem.

Question: Where is apical meristem found?

Answer: It is present at the growing tips of stem and root, it increases the length of the stem and roots.

Question: Which tissue make up the husk of coconut?

Answer: Sclerenchyma.

Question: What are the constituents of phloem?

Answer: Phloem constitutes the sieve tubes, companion cell, phloem parenchyma and phloem fibers.

Question: Define aerenchyma.

Answer: When the cells have air-filled large cavities of parenchyma, it is called aerenchyma. Aerenchyma helps aquatic plants in floating.

Question: What is the utility of tissues in multi-cellular organisms?

Answer: It helps in growth, organisation of different organs and performing functions.

Question: Name the two types of tissues.

Answer: Plant tissues and animal tissues.

Question: Name the two types of plant tissue.

Answer: Meristematic tissue and permanent tissue.

Question: What is differentiation?

Answer: The process of taking up a permanent shape, size and function by cells is called differentiation.

Question: Name the three types of meristematic tissues.

Answer: The three types are:

  1. Apical tissue—tips of root and shoot
  2. Lateral tissue—sides of stem
  3. Intercalary tissue—at nodes

Question: Where is apical tissue found?

Answer: Present at the tips of roots and stems.

Question: Tissues present at the lateral surface of the stem are called apical tissues. Put (T) if true and put (F) if false.

Rewrite the answer if (F).

Answer: (F). Tissues present at the lateral surface of the stem are called lateral tissue.

Question: Which tissues are present at the nodes of the plants?

Answer: Intercalary tissue.

Question: What are the various types of blood cells?

Answer: There are three types:

  1. RBC’s
  2. WBC’s and
  3. Platelets

Question: What are tracheids?

Answer: They are elongated cells with tapering ends.

Question: What are guard cells?

Answer: Each stomata is bounded by a pair of specialized kidney-shaped epidermal cells called guard cells.

Question: Epithelial tissue is the simplest tissue. Write (F) for false or (T) for true.

Answer: (T).

Question: What are the functions of cuboidal epithelium?

Answer: It helps in absorption, excretion, secretion, it also provides mechanical support.

Question: What is a tissue?

Answer: A group of cells that are similar in structure and work together to do a peculiar function is called tissue.

Question: What is the utility of tissues in multi-cellular organisms?

Answer: Tissues provide structural strength, mechanical strength, show division of labor.

Question: Name types of simple tissues.

Answer: The types of simple tissues are parenchyma, collenchyma, sclerenchyma and aerenchyma.

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