Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells of the following.
Which of the cells are least likely to be replaced by new cells?
Liver cells
Neurons
Malpighian layer of the skin
Osteocytes
Correct Answer :
B. Neurons
Neurons are the basic structural and functional units of the nervous system. Neurons are least likely to be replaced by new cells as they have least regeneration power.
Related Questions
Read the following statements and answer the question.
- They have a hard and non-pliable ground substance rich in calcium salts and collagen fibres.
- They support and protect softer tissues and organs.
- Osteocytes are present in the spaces called lacunae.
- They also interact with skeletal muscles attached to them to bring about movements.
Which of the following type of tissue is being described by above statements ?
Cartilage
Bone
Blood
Neurons
In all connective tissues, except which of the following, the cells secretes the fibres of collagen or elastin protein ?
Bone
Cartilage
Areolar connective tissue
Fluid connective tissue
Muscle tissue cells are contractile, which means they
are responsible for the production and secretion of enzymes.
are specialized in contraction and relaxation.
help in the movement of involuntary organs only.
all of the above
Three essential components of most neurons are
simple epithelium, extracellular matrix and nerves.
axon, dendrites and cell body.
nerve cells, synapse and neuroglia.
mylein sheeth, node of Ranvier and Schwann cells.
The following figures A, B and C are types of muscle tissue. Identify A, B and C.
A Smooth muscle, B Cardiac muscle, C Skeletal muscle
A Skeletal muscle, B Smooth muscle, C Cardiac muscle
A Cardiac muscle, B Smooth muscle, C Skeletal muscle
A Smooth muscle, B Skeletal muscle , C Cardiac muscle
Non-ciliated simple columnar epithelium often contains _______, which increase the surface area for secretion and absorption.
flagella
collagen fibres
microvilli
all of these
Which of the following vertebrate tissues would be an excellent source of collagen?
Liver
Nerve
Muscle
Tendon
Identify the figure with its correct function Fig :. Adipose connective tissue
Areolar connective tissue Serves as a support framework for epithelium.
Adipose tissue Store fats and act as heat insulators.
Dense regular tissue Provide flexibility.
Dense irregular tissue Provide strength and elasticity.
The given figure shows the nephridial system of earthworm and answer the question.
Select the option which shows the correct identification and the function of the structure marked as X.
Lateral heart. It is a blood pumping organ.
Calciferous glands. They neutralize the humic acid present in humus.
Nephridia. It regulates the volume and composition of the body fluids.
Blood glands. They produce blood cells and haemoglobin which is dissolved in blood plasma.
Smooth muscles are______.
voluntary, branched, uninucleate
voluntary, multinucleate, cylindrical
involuntary, cylindrical, multinucleate
involuntary, spindle shaped, uninucleated, tapering
Male cockroach can be identified from the female by the presence of
long antennae
wingless body
elongated abdomen
anal styles
The given figure shows open circulatory system of cockroach with structure marked as A, B and C. Which structure is a 13 pair of wing shaped involuntary muscles and mantain blood circulation?
A
B
C
Both A nad B
Hair present in the skin are
epidermal in origin and made of dead cells.
epidermal in origin and made of living cells.
dermal in origin and made of living cells.
dermal in origin and made of dead cells.
The secretions of endocrine glands are released directly
into the skin surface
into the blood stream
into a gland duct
into the brain tissue
What will happen if ligaments are cut or broken?
No movements at joints.
Bones will become fixed.
Bones will become unfixed.
Bone will move freely at joints.
Consider the following statements regarding cockroach and mark the correct option.
- Head is formed by the fusion of 6-segments.
- Mouth parts are biting and chewing type.
- Crop is the part of mid gut.
Only (ii) is correct
(ii) and (iii) are correct
(i) and (ii) are correct
Only (iii) is correct
Which of the following statements regarding frog is not correct?
Fertilization is external and takes place in water.
External ear and tympanum can be seen externally.
In females the ureters and oviduct open separately in the cloaca.
Copulatory pad on the first digit of the fore limbs and vocal sac are present in male frog.
Which of the following statement is incorrect regarding cuboidal epithelium ?
It is an epithelial tissue.
It is composed of a single layer of cube-like cells.
They are found in the walls of blood vessels and air sacs of lungs.
Secretion and absorption are the main functions of these tissue.
The fibres of which of the following muscles are fusiform and do not show striations
Skeletal muscles
Cardiac muscles
Both (a) and (b)
Smooth muscles
Neuroglia are
excitable cells of neural tissue.
supporting and non-excitable cells of neural tissue.
two to three times in volume of neural tissue.
protective and excitable cells of neural tissue.
Cockroaches are brown or black bodied animals that are included in class _______ of phylum _______.
reptilia; annelida
insecta; arthropoda
insecta; annelida
reptilia; arthropoda
Read the following statements.
- It is a contractile tissue present only in the heart.
- Cell junctions fuse the plasma membranes of these cells and make them stick together.
- Communication juntions at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
Which of the following type of tissue is being described by the above statements ?
Skeletal muscle
Cardiac muscle
Smooth muscle
Cartilage
When cardiac muscle cells are damaged by a heart attack, they are usually replaced by
connective tissue cells
new smooth muscle cells
new cardiac muscle cells
epithelial cells
Which of the following statement is/are correct regarding digestive system of cockroach ?
- Mouth opens into a short tubular pharynx, leading to a narrow tubular passage called oesophagus.
- Gizzard helps in grinding the food particles.
- A ring of 6-8 blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut, which secrete digestive juice.
- At the junction of midgut and hindgut is present another ring of 100-150 yellow coloured thin filamentous malphigian tubules which help in removal of excretory products from haemolymph.
Only (i)
Both (ii) and (iii)
Both (i) and (iv)
All of these
The supportive skeletal structures in the human external ears and in the nose tip are examples of
ligament
areolar tissue
bone
cartilage
Match the description given in column I with their examples given in column II and choose the correct option.
| Column I | Column II |
|---|---|
| (Description) | (Example) |
| 1. Aquatic respiratory | A. Skin organ |
| 2. Organ which acts | B. Ureter urogenital duct and opens into the cloaca |
| 3. A small median chamber | C. Cloaca that is used to pass faecal matter, urine and sperms to the exterior |
| 4. A triangular structure | D. Sinus venosus which joins the right atrium and receives blood through vena cava |
1 - A, 2 - B, 3 - C, 4 - D
1 - C, 2 - A, 3 - D, 4 - B
1 - B, 2 - A, 3 - C, 4 - D
1 - C, 2 - B, 3 - D, 4 - A
Which of the following statement(s) is/are correct regarding cockroaches ?
- The body of the cockroach is segmented and divisible into three distinct regions head, thorax and abdomen.
- Blood vascular system is of closed type.
- They are monoecious and both sexes have well developed reproductive organs.
- The development of P. americana is paurometabolus, meaning there is development through nymphal stage.
Both (i) and (ii)
Both (ii) and (iii)
Both (i) and (iv)
All of these
The kind of epithelium which forms the inner walls of blood vessels is
cuboidal epithelium
columnar epithelium
ciliated columnar epithelium
squamous epithelium
In which one of the following preparations, cell junctions come across most frequently ?
Ligament
Tendon
Cartilage
Ciliated epithelium
Match the terms given in column-I with their feature given in column-II and choose the correct option.
| Column-I | Column-II |
|---|---|
| (Terms) | (Features) |
| A. Exocrine gland | I. They help to stop substances from leaking across a tissue |
| B. Endocrine gland | II. Hormones are secreted directly into the fluid bathing the gland |
| C. Tight junctions | III. They perform cementing to keep neighbouring cells together. |
| D. Adhering junctions | IV. Secretes mucus, saliva, earwax, oil, milk, digestive enzymes and other cell products |
A IV; B II; C I; D III
A II; B IV; C I; D III
A IV; B II; C III; D I
A IV; B I; C II; D III