BSEB Bihar Board Class 9 Science Solutions Chapter 6 Tissues
Bihar Board Class 9 Science Solutions Chapter 6 Tissues Textbook Questions and Answers, Additional Important Questions, Notes.
Bihar Board Class 9 Science Chapter 6 Tissues InText Questions and Answers
What is a tissue?
A group of cells that are similar in structure and work together to achieve a particular function is called tissue.
What is the utility of tisues in multi-cellular organisms ?
In multicellular organisms division of labour is due to presence of tissues. Each tissue performs a specific function efficiently.
Think about which gas may be required for photosynthesis?
Carbon dioxide (CO2) gas.
Find out the role of transpiration in plants.
Eoles / functions of transpiration :
- It is due to this that water and mineral from roots reach leaves and other parts of the plants.
- It helps in the ripening of crops and fruits.
- It helps in maintaining humidity which keeps the surrounding tempera-ture low.
Name types of simple tissues.
Where is apical meristem found?
Apical meristem is found in the, tips of roots and stems. These help in the growth of roots and stems.
Which tissue makes up the husk of cotton?
The husks of cotton that are used in making strings and ropes are made up of phloem fibres.
What are the constituents of phloem?
- Sieve tubes
- Companion cells
- Phloem parenchyma
- Phloem fibres.
Name the tissue responsible for the movement in our body.
What does a neuron look like?
A neuron looks like a long thread-like structure.
Give three features of cardiac muscles.
- These muscles show rhythmic contraction and relaxation throughout life.
- These are found only in the wall of the heart.
- These have only one or two centrally located nuclei.
What are the functions of areolar tissue?
These tissues are found between skin and muscle and around the blood vessels. They fill the gap between the organs. They protect the internal organs and mend the damaged tissues.
Bihar Board Class 9 Science Chapter 6 Tissues Textbook Questions and Answers
Define the term “tissue”.
The group of cells having similar structure and function is called tissue.
How many types of elements together make xylem tissue? Name them.
Xylem tissue is made up of four elements. They are
- Xylem parenchyma,
- Xylem fibres.
How are simple tissues different from complex tissues.in plants?
Simple tissues are made up of one type of cell which perform similar functions. Complex tissues are made up of cells of more than one type but they perform similar functions.
Differentiate between parenchyma, collenchyma and scleren-chyma on the basis of their cell wall.
What are the functions of stomata?
- They are involved in the exchange of gases.
- They help in the removal of excess water by the process of transpiration.
Diagrammatically show the difference between the three types of muscle fibres.
What is the specific function of cardiac muscle?
It helps in the rhythmic contraction and relaxation of heart wall throughout the life.
Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body.
Draw a labelled diagram of as neuron.
Name the following :
(a) Tissue that forms the inner lining of our mouth.
(b) Tissue that connects muscle to bone in humans.
(c) Tissue that transports food in plants.
(d) Tissue that stores fat in oilr body.
(e) Connective tissue with a fluid matrix.
(f) Tissue present in the brain.
(a) Squamous epithelium
(d) Adipose tissue
(f) Nervous tissue
Identify the types of tissue in the following: skin, bprk of tree, bone, lining of kidney tubule, vascular bundle.
(i) Skin – Squamous epithebum
(ii) Bark pf tree – Cork (protective tissue)
(iii) Bone – Connective tissue
(iv) Lini’ng of kidney tubule – Cuboidal epithelium
(v) Vascular bundle – Conductive tissue
Name the regions in which parenchyma tissue is present.
Parenchyma tissue is present in cortex and marrow of roots and stems. When it bears chlorophyll, it is found in green leaves.
What is the role of epider-mis in plants?
The epidermis forms a continuous layer or +covering without any intercellular space. It protects all the plant parts.
How does cork act as a protective tissue?
Cork acts as a protective layer because –
(i) It has dead cells and it forms layer without leaving any intercellular space.
(ii) Suberin is deposited on its wall which makes it able to help the exchange of gases.
So, cork protects from excessive water loss and effects of the environment.
Complete the table.
Bihar Board Class 9 Science Chapter 6 Tissues Textbook Activities
- Take two glass jars and fill them with water.
- Now, take two onion bulbs and place one on each jar, as shown in Fig. 6.1 of the textbook page 69.
- Observe the growth of roots in both the bulbs for a few days.
- Measure the length of roots on day 1, 2 and 3.
- On day 4, cut the root tips of the onion bulb in jar 2 by about 1 cm. After this, observe the ,, growth of roots in both the jars and measure their lengths each day for five more days and record the observations in tables, like the table below :
(i) Which of the two onions has longer roots? Why?
(ii) Do the roots continue growing even after we have removed their tips?
(iii) Why would the tips stop growing in jar two after we cut them?
(i) The first on has longer roots. This was because the meristematic u cues present on the root tips of onion kept in the second onion were cut out.
(ii) NO2 the roots stop to grow.
(iii) This is so because the meristematic tissues present at the root tips have been removed by cutting the roots.
- Take a plant stem and with the help of your teacher cut into very thin slices or sections.
- Now, stain the slices with safranin. Place one neatly cut section on a slide, and put a drop of glycerine.
- Cover with a cover-slip and observe under a microscope. Observe the various types of cells and their arrangement. Compare it with Fig. 6.4 given in the textbook page 70.
- Now, answer the following on the basis of your observation:
(i) Are all cells similar in structure?
(ii) How many types of cells can be seen?
(iii) Can we think of reasons why there would be so many types of cells?
(i) NO2 they have differences.
(ii) Almost eight different types of cells like Parenchyma, collenchyma, sclerenchyma, trachieds, vessels, vascular tubes, companion cells, meristematic cells, etc. can be seen.
(iii) In fact, these different types of cells are present to support division of labour. Each special type of cell is meant for performing specific function.
We can also try to cut sections of plant roots, we can even try cutting sections of root and stem of different plants.
Bihar Board Class 9 Science Chapter 6 Tissues Additional Important Questions and Answers
Are plants and animal cells similar?
No, there are some noticeable differences between them.
Distinguish between plant and animal tissues.
(i) Animals move around, whereas plants are stationary or fixed. .
(ii) Animals need more energy, whereas plants need less. –
(iii) Most of the animal tissues are living and they contain protoplasm, while most of the plant tissues are dead.
What are simple and complex tissues?
The tissue which is made up of same (one) type of cell is called .simple tissue. The tissue which is made up olrce 11s of more than one type is called complex tissue.
Mention the features of meristematic – tissues.
Following arj^ the features of meristematic tissues:
(i) These tissues are made up of identical thin-walled I cells.
(ii) The cells of meristematic tissues can be spherical, oval, rectangular or polygonal.
(iii) The cells of meristematic tissues divide rapidly to help the growth and development of plants.
(iv) The cells of these tissues are closely packed without occupying more space.
(v) The cells of meristematic tissues have dense cytoplasm and a large nucleus.
(vi) Some vacuoles may be present or absent in the cells of meristematie tissue.
On the basis of their presence, in how many types the meristematic tissues can be divided?
Meristematic tissues can be divided into three types :
(ii) Lateral (Cambium)
What are the functions of cambium?
Cambium is responsible for increase in the girth : of roots and stems and also it forms rings after a certain time, which indicate the age of the tree.