CBSE 9th Biology | Organization in the Living World- Practice Questions

Organization in the Living World- Practice Questions

Fill in the Blanks

1……………………. tissues are regions where cells have lost their ability to divide.

2. Elongated cells with thickenings at corners constitute

3. Tracheids and vessels are the main elements in the xylem.

4. Lining of alveoli and blood capillaries is formed by epithelium.

5…………………….. connect bones to bones.

6. The………………. meristem is located at the tips of the root stem or branch.

7. The dense connective tissues that connect muscle to bone are called

8. Permanent tissues are derived from……. tissue once they lose the ability to divide.

9. Nervous tissue is made of….. that receive and conduct impulses.

10. Xylem and phloem are types of… tissues.

True False

11. Connective tissue functions in binding and supporting animal tissues.

12. Histology is the study of cells and tissues.

13. Adipose tissue is a type of connective tissue.

14. Blood is a type of connective tissue.

15. Voluntary muscles do not get tired on sustained use.

16. Striated, unstriated and cardiac are three types of muscle tissues.

17. Schwann cells insulate nerve fibers within the nervous system.

18. Xylem and phloem are specialized conductive tissues that transport materials through the plant.

19. The palisade layer of the leaf is composed of photosynthetic parenchyma cells.

20. The cells that make up the meristematic region of a plant are specialized and differentiated.

Match Column

Each question contains statements given in two columns which have to be matched. Statements (A, B, C, D) in column I have to be matched with statements (p, q, r, s) in column II.

Question 21. Match the tissue types with their functions

                          Column I                                   Column II

(A)   Dermal tissue               (p) Adds new cells through growth

(B)   Meristematic                (q) Conduct water and tissue dissolved nutrients

(C)   Ground tissue               (r) covers, protects plant; regulates gas exchange

(D)Vascular tissues              (s) Makes up bulk of plant; stores nutrients; photosynthesizes

Question 22. Match the connective tissue type with its location in the body.

                        Column I                                      Column II

(A) Loose connective                            (p) Ears and joints

(B) Dense connective                           (q) Circulatory system

(C) Blood                                             (r) Under skin

(D) Cartilage                                        (s) Ligaments and tendons

Question 23.

                        Column I                                      Column II
(Contraction speed)                              (Muscle
)

(A) Fast                                          (p) Cardiac

(B) Moderate                                   (q) Smooth

(C) Slow                                          (r) Skeletal

Question 24.

                          Column I                                  Column II

                            (Cell)                                      (Function)

(A) Parenchyma                              (p) water transport

(B) Sclerenchyma                           (q) water and nutrient support

(C) Tracheids                                  (r) Storage, division

Multiple Choice Questions

Questionn 25. Simple tissues are

(a) Parenchyma, xylem and collenchyma

(b) Parenchyma, collenchyma and sclerenchyma

(c) Parenchyma, xylem and sclerenchyma

(d) Parenchyma, xylem and phloem

Question 26. The living cells providing tensile strength are

(a) Parenchyma

(b) Collenchyma

(c) Sclerenchyma

(d) Sclerotic cells

Question 27. Quiescent centre is found in

(a) Root tip

(b) Cambium

(c) Shoot tip

(d) Leaf tip

Question 28. The conducting cells of xylem are

(a) Tracheary elements

(b) Sieve elements

(c) Companion cells

(d)  All the above

Question 29. The chief function of vessels in the plant body is

(a) to translocate food material

(b) to conduct water and mineral salts

(c) to support living cells

(d) all the above

Question 30. Inner surface of fallopian tubes, bronchi and bronchioles are lined by

(a) Squamous epithelium

(b) Ciliated epithelium

(c) Columnar epithelium

(d) Cubical epithelium

Question 31. Average life span of human R.B.C. is

(a) 100 days

(b) 90 days

(c) 120 days

(d).None

Question 32. Which set clearly identify striated muscles

(a) Cylindrical, syncytial and unbranched

(b) Spindle, unbranched and uninucleated

(c) Cylindrical, striped and nucleated

(d) Cylindrical, striped and branched

Question 33. Cardiac muscle cells are cylindrical branched

(a) Uninucleate and voluntary

(b) Uninucleate and involuntary

(c) Multinucleate and voluntary

(d) Multinucleate and involuntary

Question 34. The fibrous tissue which connects the two bone is

(a) Connective tissue

(b) Tendon

(c) Ligament

(d) Adipose tissue

Question 35. Largest number of cell bodies of neuron in our body are found in

(a) Retina

(b) Spinal cord

(c) Brain

(d) Tongue

Question 36. Neurons are classified on the basis of

(a) Number of nucleus present

(b) Number of processes arising from the cell body

(c) Number of dendrites present

(d) Number of axons present

Question 37. Tissues that have long and narrow cells are called

(a) Cuboidal epithelium

(b) Squamous epithelium

(c) Germinal epithelium

(d) Columnar epithelium

Question 38. The vascular tissues of the plant function in

(a) Support

(b) Support and transport of materials

(c) Secretion of plant hormones

(d) All of the above

Question 39. Which tissue lacks blood supply and heals slowly

(a) Nervous

(b) Muscle

(c) Cartilage

(d) Bone

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CBSE 9th Biology | Organization in the Living World- Long Answer Type Questions

Organization in the Living World- Long Answer Type Questions

Question 1. Give a brief account of vascular or conductive tissues in plants.

Answer.

In vascular bundle of plants, conducting or vascular tissues-xylem and phloem are present. Presence of these tissues is a peculiar feature of higher plants due to which they are able to survive in terrestrial habitat. Xylem and phloem are complex permanent tissues, made of more than one type of cells. All the cells together perform a common function.

clip_image002

Fig. A vascular bundle

1. Xylem-

Xylern is composed of 4 types of cells :

(i) Xylem tracheids

It is tubular in structure with thick cell wall. It helps in vertical transportation of water and minerals absorbed by roots. The cells are usually dead.

(ii) Vessels

Vessels are structurally same as tracheids. These are tube like with perforations called pits.

(iii) Xylem parenchyma

It stores food and helps in sideways conduction of water.

(iv) Xylem fibers

They are dead cells. Sometimes deposition of lignin is also seen.

They are mainly supportive in function.

2. Phloem

The conductive tissue phloem is composed of 4 types of cells- sieve tubes, companion cells, phloem fibers and phloem parenchyma,

(i) Sieve tubes

They are tubular cells with perforated walls, composed of living cells.

They lack nucleus.

clip_image004

Fig. Section of Phloem
(ii) Phloem parenchyma

It is composed of living cells. Function is storage.

(iii) Companion cells

They are living cells with nucleus. It helps in transport of food from leaves to other parts of the plant.

(iv) Phloem fibers 

It is composed of all dead cells. It is supportive in function. Functions- Xylem helps in conduction of water and minerals from roots to the leaves and other parts. Water and minerals move in one direction in xylem. Phloem helps in conduction of food (sugar) prepared by leaves during photosynthesis. Phloem transports sugar from leaves to other parts of the plant. Materials can move in both directions in phloem.

Question 2. Explain the structure and function of neuron.

Answer.

Nervous system of animals is composed of nervous tissue. The cells of this tissue are called nerve cells or neurons. Neurons are units of nervous tissue and possess the ability to respond to stimuli. Many nerve fibers bound together by connective tissue to form a nerve. Structure- A neuron looks like a tree with branches and roots. It consists of mainly two parts-a cell body or cyton and axon. Cell body or cyton has a nucleus and cytoplasm. Cytoplasm has cell organelles like golgi body, mitochondria and endoplasmic reticulum. Axon is a long thin cytoplasmic extension that conducts nerve impulse.”

The end of axon has branching terminals called axon terminals that forms contact with other neurons. The axon is covered by a myelin sheath. Nodes of Ranvier are also present in axon.

clip_image006

Functions

Neurons have ability to respond to stimulus. In presence of any stimulus they get stimulated and transmits the stimulus very rapidly from one place to another inside the body. Nerve impulses allow us to move our muscles. The nervous tissue in combination with muscular tissue helps in the movement of animals. Dendrite is receptor of chemical, mechanical and visual stimulus. From here the stimulus travels along axon and through axon terminal it is passed on to the other neuron.

Question 3. What are different types of connective tissues present in animals.

Answer.

In animals group of cells form tissues that carry out different functions in different parts of the body. These cells have specialized structure which enables them to carry out a particular function. The cells of connective tissue are loosely spaced and embedded in intercellular matrix which may be jelly like, fluid, dense or rigid depending upon the function.

Different types of connective tissues present in animals are-

(1) Blood
(2) Bone
(3) Cartilage
(4) Areolar tissue
(5) Adipose tissue

Blood

Blood is the fluid connective tissue.It has fluid matrix called plasma in which three types of blood cells are present. They are

(i) Red blood cells (RBCs) 
(ii) White blood cells (WBCs)
(iii) Blood Platelets,
(i) RBCs

These are red in colour due to presence of red colour pigment haemoglobin in them. Also called erythrocytes. These cells lack nucleus and mitochondria. They help in the transport of oxygen to various parts of the body.

(ii) WBCs

These are nucleated cells. Sometimes more than one nucleus are present. Their function is to kill germs entering the body.

(iii) Platelets

Platelets help in coagulation of blood during a cut.

Bone

Bone forms the framework and gives a definite shape to the body. It is strong and non flexible tissue. The cells lie embedded in a hard matrix composed of calcium and phosphorus compounds.

The bones are connected to each other by ligament which is elastic. Tendons connect
muscles to bones which is fibrous and less flexible.

Cartilage

The cells are widely spaced The solid matrix is composed of proteins and sugars. It is presents in the nose, esr: trachea and larynx.

Areolar tissue

This tissue is found between skin and muscles, around blood vessels and nerves and in bone marrow. It fills the space inside the organs, supports internal organs and helps in repair of tissues.

Adipose tissue

It is fat storing tissue found below the skin and between internal organs. The cells are filled with fat globules. Fat present below the skin acts as an insulator. This layer of fat is very thick in animals as compared to man.

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