AP State Board new syllabus AP Board Solutions Class 9 Biology 6th Lesson Tissues Questions and Answers.
Biology 9th Class 6th Lesson Questions and Answers Tissues
9th Class Biology 6th Lesson Tissues Questions and Answers (Exercise)
Question 1.
Do plants and animals have the same structure? Do they both perform similar functions?
Answer:
- Plants and animals have different types of structure and function.
- Though the basic functions show similarity, yet the functions are different from each other.
Question 2.
Can we think why meristematic tissue would lack vacuoles ?
Answer:
Since meristems are young cells and actively dividing, they do not participate actively in food preparation. Also they do not produce a large amount of waste. Hence they lack vacuoles.
Question 3.
What happens to the cells formed by meristematic tissue?
Answer:
- Cells of a meristematic tissue can either continue to divide and remain as meristematic.
- They may also differentiate and lose their ability to divide and form permanent tissues.
Question 4.
In some plants like desert plants, epidermis has a thick waxy coating of cutin on its outer surface. Can we think of a reason for this ?
Answer:
- A thick, waxy coating of cutin is present on the epidermis of desert plants.
- It helps in reducing the loss of water in desert plants.
- Suberin which also a chemical, is present in the walls of dead cork cells. It makes these cells impervious to gases and water.
Question 5.
Is the outer layer of a branch of a tree different from the outer layer of a young stem?
Answer:
- The outer most layer of the trees is covered by the bark.
- It gives strength and protects the plant from injury and infections.
- The bark is made up of dead cells from different origins like cork, phelloderm, cortex, phloem, and xylem.
- The outer layer of the young stem is made up of living cells.
Question 6.
In Fig 6.3 showing a section of stem, can you see different types of cells in the vascular bundle?
Answer:
Yes, we can see different types of cells in the vascular bundle.
Question 7.
When we breathe we can actually feel the movement of our chest. How do these body parts move?
Answer:
These body parts move by the specialised cells called muscle cells.
Question 8.
During breathing we inhale oxygen. Where does this oxygen go ?
Answer:
It is absorbed in the lungs and then is transported to all the body cells through blood.
Question 9.
Why would cells need oxygen?
Answer:
- Oxygen helps organisms grow, reproduce, and turn food into energy.
- Humans get the oxygen they need by breathing through their nose and mouth into their lungs.
- Oxygen gives our cells the ability to breakdown food in order to get the energy we need to survive.
Question 10.
What would be the advantage of strong and nonflexible properties for bone functions?
Answer:
Strong and non = flexible characteristic of bones provide shape to the body and skeletal support.
Question 11.
They are also called unstriated muscles? Why would they be called that ?
Answer:
Smooth muscles are called unstriated muscles because these muscles show no cross striations and look smooth.
9th Class Biology 6th Lesson Questions and Answers (InText)
Question 1.
What is a tissue?
Answer:
A tissue is defined as a cluster of cells which are similar in structure and work together to perform a particular function.
Question 2.
What is the utility of tissues in multicellular organisms ?
Answer:
The use of tissues in multicellular organisms is to provide structural and mechanical strength as well as to allow division of labour.
Question 3.
Name the types of simple tissues.
Answer:
The types of simple tissues are :
- Parenchyma
- Collenchyma
- Sclerenchyma
Question 4.
Where is apical meristem found ?
Answer:
In plants, apical meristem is typically found at
- the tip of the shoot
- root of the plant
Question 5.
Which tissue makes up the husk of coconut?
Answer:
- The sclerenchyma tissue, which is a type of permanent tissue makes up the husk of coconut.
- These tissue causes the plant become stiff and hard.
- The cells of this tissue are dead and their cell walls are thickened because of the presence of lignin.
Question 6.
What are the constituents of phloem?
Answer:
The phloem constitutes of the following four elements they are :
- Sieve tube
- Companion cells
- Phloem parenchyma
- Phloem fibres
Question 7.
Name the tissue responsible for movement of our body.
Answer:
Two tissues jointly are responsible for the movement of our body namely –
- Muscular tissue
- Nervous tissue
Question 8.
What does a Neuron look like ?
Answer:
- A Neuron is a Nerve cell comprising the cell body with a nucleus and cytoplasm from which a long and thin hair like structure emerges.
- Every neuron has one elongated part known as the -axon, and several short and small branched structures known as dendrites.
- A single neuron can even be a meter long.
Question 9.
Give three features of cardiac muscles.
Answer:
a) Cardiac muscles are specialised tissues that are evolved to pump blood through out the body.
b) The following are the features of cardiac muscles :
- They are cylindrical in shape.
- Striated muscle fibres.
- They are uninucleated and branched.
- These muscles are involuntary in nature.
Question 10.
What are the functions of areolar tissue?
Answer:
- Areolar tissues are typically obşerved in animals.
- They are connective tissues and are found in between skin and muscles.
- They are also located around blood vessels and nerves, and are present in the bone marrow.
- The space inside the organs is filled with these tissues.
- They support the delicate internal organs and assist in tissue repair in case of damage.
9th Class Biology Chapter 6 Questions and Answers (Lab Activities)
(Page No. 26)
Aim : To observe the growth of roots in onion bulbs.
Things required : Two glass jars, onion bulbs, water, blade.
Procedure :
- Take two glass jars and filled them with water.
- Now take two onion bulbs and placed one on each jar, as shown in figure.
- Observe the growth of roots for 3 days.
- On the 4th day, I cut the root tips of the inion bulb in jar 2 by about 1 cm.
- Observation : The growth of roots in both the jars and measure their lengths each
day for five more days and record the observations in given tables :
| Length | Day 1 | Day 2 | Day 3 | Day 4 | Day 5 |
| Jar 1 | 2.0 cm | 3.0 cm | 3.5 cm | 4.0 cm | 4.5 cm |
| Jar 2 | 2.0 cm | 2.0 cm | 2.0 cm | 2.0 cn | 2.0 cm |
And answer the following questions after observation.
Observation :
Question 1.
Which of the two onions has longer roots ?
Answer:
Onion in Jar-1 has longer roots because they keep on growing due to the presence of apical meristem in root tip.
Question 2.
Do the roots continue growing even after we have removed their tips ?
Answer:
No, the roots do not continued growing even after we have removed their tips.
Question 3.
Why would the tips stop growing in Jar-2 after we cut them?
Answer:
The tips stopped growing because the meristematic tissue not available there. Inference :
The growth of the plants occurs only in certain specific regions. This is because of the dividing tissue, meristematic tissue.
(Page No. 28)
Aim: To observe section of a stem.
Things required: Plant stem, Blade, slide, Coverslip, Saffranin, Glycerine microscope.
Procedure :
- Take a plant stem and with the help of your teacher cut into very thin slices or sections.
- Stain the slices with safranin and placed one neat section on a slide, and put a drop of glycerine.
- Cover it with a coverslip and observe the various types of cells and their arrangement and answer the questions.
Observation :
Question 1.
Are all cells similar in structure?
Answer:
No, all cells are not similar in structure.
Question 2.
How many types of cells can be seen ?
Answer:
6 types of cells can be seen.
Question 3.
Can we think of reasons why there would be so many types of cells?
Answer:
Yes, to perform different types of functions, there would be so many types of cells.
(Page No. 30)
Aim : To observe the Guard cells and epidermal cells in epidermis.
Things required :
Rheo leaf, blade, needle, slide, water, safranin, coverslip, microscope.
Procedure :
- Take a freshly plucked leaf of Rheo.
- Stretch and broke it by applying pressure.
- Remove the peel and put it in a petridish filled with water.
- Add few drops of safranin.
- Wait for a couple of minutes and then transfer it on to a slide and gently place a coverslip over it.
- Observe it under a microscope.
Observation :
Answer:
I observed that there is an outermost layer of cells and some stomata, guard cells.
Inference :
The outermost layer of cells is called epidermis and it contains so many organelles such stomata, guard cells etc.
(Page No. 36)
Take a drop of blood on a slide and observe different cells present in it under a microscope.
Answer:
Aim : To observe the blood and its types.
Things required : Adrop of blood, slide, cover slip, microscope, a needle.
Procedure :
- Collect a drop of blood with the help of a needle.
- Put it on the slide and cover it with a coverslip.
- Observe under a microscope.
Observation :
I found different types of cells in the fluid called blood.
Inference :
Blood has a liquid matrix called plasma, in which red blood corpuscles, white blood corpuscles and platelets are suspended.
(Page No. 36)
Compare the structures of different types of muscular tissues. Note down their shape, number of neuclei and position of nuclei within the cell in table 6.1.
Answer:
Aim : To observe shape, number of nuclei and its position in different types of muscles.
Things required : Permanent slides of muscle cells, Microscope.
Procedure :
- Take different types muscles permanent slide i.e., striated, smooth, cardiac muscles etc.
- Observation each slide one by one and note down in the table below.
Observation :
