Wednesday, November 4, 2020

Structural Organisation in Animals | Class 11 | Previous Years Questions and Answers (2015 to 2020)

STRUCTURAL ORGANSIATION IN ANIMALS

2020 MARCH


1. ‘Cockroach is said to be Uricotelic.’ (Score 2)

a. What do you understand about the nature of excretion of Cockroach from this statement?
b. Name two excretory organs of Cockroach.

✔️Answer:

(a) Cockroach excretes uric acid as major nitrogenous waste.
(b) Malpighian tubules, Nephrocytes.

2. Rewrite the given sentences if there is any mistake in the underlined part. (Score 2)
  • Cartilage cells are called osteocytes.
  • Bones are rich in Calcium salts.
  • Intercalated discs are seen in skeletal muscle.
  • Skeletal muscles are striated.
    ✔️Answer:
  • Cartilage cells are called chondrocytes.
  • Intercalated discs are seen in cardiac muscle.

2019 JULY


1. (a) Identify the tissues based on the features given below: (Score 2)

i) Intercalated disc.
ii) Involuntary in action

    (b) Mention the function of intercalated disc.

✔️Answer:

(a) Cardiac muscle
(b) It allows cells to contract as a unit, i.e., when a cell receives signal to contract, other cells also contract.

2. Identify the function of the following structures of cockroaches. (Score 2)

(a) Compound eye
(b) Arthrodial membrane
(c) Seminal vesicle
(d) Malpighian tubules

✔️Answer:

(a) Compound eye: Mosaic vision.
(b) Seminal vesicle: To store sperms.
(c) Arthrodial membrane: Connect the sclerites.
(d) Malpighian tubules: Excretion.

2019 MARCH


1. Tendons and ligaments are examples of ............. tissue. (Score 1)

a) Areolar
b) Adipose
c) Dense regular
d) Dense irregular

✔️Answer: (c) Dense regular

2. Match Column A with Those in columns B and C. (Score 3)

A

B

C

a.    Type of simple Epithelium

Location

Function

b.   Squamous Epithelium

......... (a) .........

Diffusion

c.    ......... (b) .........

Ducts of glands and tubular parts of nephrons in kidneys

......... (c) .........

d.   Columnar Epithelium

......... (d) .........

Secretion and Absorption

e.    ......... (e) .........

Inner surface of bronchioles and fallopian tubes

......... (f) .........


✔️Answer:

(a) Walls of blood vessels and lung alveoli.
(b) Cuboidal (cubical) epithelium.
(c) Secretion and absorption.
(d) Lining of stomach and intestine.
(e) Ciliated epithelium.
(f) Movement of particles.
 

2019 MODEL


1. (a) Name the labeled Parts A, B in the diagram given below. (Score 2)


    (b) Which among the following is the bone cell?

(Leucocyte, Chondrocyte, Osteocyte, Thrombocyte) 

✔️Answer:

(a) A= Chondrocyte, B= Collagen fibres
(b) Osteocyte

2. Observe the pool of connective tissues carefully, classify them under three headings. (Score 2)


✔️Answer:

Loose connective tissues:

> Areolar tissue
> Adipose tissue

Dense connective tissues:

> Tendon
> Ligament

Specialized connective tissues:

> Bone
> Blood

3. The mounting of mouth parts of cockroach is given below. If there is any error, correct it. (Score 2)


✔️Answer:

(a) Labrum
(b) Maxilla
(c) Hypopharynx
(d) Labium
(e) Mandible
 

2018 AUGUST


1. Observe the diagrams given below. (Score 2)

 

a) Identify the tissue A and B.
b) Name the specialized cells present in A and B.

✔️Answer:

(a) A= Cartilage, B= Bone
(b) A= Chondrocytes, B= Osteocytes

2. a) Among the following body parts squamous epithelium is found in …………… (Score 2)

i) the ducts of glands and tubular Parts of Nephron
ii) the lining of stomach and intestine
iii) the inner walls of blood vessels and air sacs of lungs
iv) the inner surface of bronchioles and fallopian tubes'

    b) Write any one function compound epithelium.

✔️Answer:

(a) iii) the inner walls of blood vessels and air sacs of lungs.
(b) Protection.
 

2018 MARCH


1. Identify the following tissues: (Score 2)

a) Tissue that stores fat.
b) Tissue that connects bones together.
c) Tissue that connects bones to muscles.
d) Tissue that conducts impulses.

✔️Answer:

(a) Adipose tissue
(b) Ligaments
(c) Tendon
(d) Neural tissue

2. Observe the diagram showing the alimentary canal of cockroach. 
    Name parts labeled A, B, C & D. (Score 2)


✔️Answer:

(a) Crop
(b) Hepatic caecae
(c) Malpighian tubules
(d) Colon
 

2018 MODEL


1. Bone: Osteocytes: Cartilage: ……… (Score ½)

✔️Answer: Chondrocytes

2. Identify the figures A and B. Write any one characteristic features of each A and B. (Score 3)

 

✔️Answer:

A= Smooth muscle, B= Skeletal muscle.

Smooth muscle: Non-striated, involuntary
Skeletal muscle: Striated, voluntary.
 

2017 MARCH


1. In cockroach spiracles are present in .............. (Score 1)

a) Alimentary canal
b) Tracheal system
c) Malpighian tubules
d) Reproductive system

✔️Answer: (b) Tracheal system

2. Complete the given branching diagram based on connective tissue. (Score 2)

 

✔️Answer:

(A) Specialized connective tissue
(B) Adipose tissue
(C) Irregular
(D) Cartilage
 

2016 MARCH


1. Observe the following chart and answer the given questions:

 

Fill in the missing words A and B. (Score 1)

✔️Answer:

(A) Goblet cell
(B) Exocrine gland
 

2015 SEPTEMBER (IMPROVEMENT)


1. Name any two secretions of exocrine glands. (Score 1)

✔️Answer:

Liver: Bile juice
Salivary glands: Saliva

2. Select the odd one out in the following series. (Score 1)

a. Areolar tissue, Blood, Neuron, Tendon
b. Hypopharynx, Malpighian tubules, Maxillae, Labrum

✔️Answer:

(a) Neuron
(b) Malpighian tubules

3. In a laboratory session, your Biology teacher exhibited blood smears (slides) of cockroach and human beings under microscope. How will you distinguish them based on the nature of plasma & blood cells? (Score 2)

✔️Answer:

Blood of cockroach:
Contains colourless plasma and haemocytes.

Human Blood:
Contains straw coloured plasma and blood cells such as RBC, WBC & platelets.
 

2015 MARCH


1. If the head of a cockroach is cut off, it will be alive for as long as one week. Give clarification for this statement. (Score 1)

✔️Answer:

The head holds only a bit of nervous system. Remaining part is situated along the ventral part of the body.

2. The diagram given below is a simple epithelium. 
 
a. Name the part marked as “P” in the figure.
b. Write one function of a simple epithelium. (Score 1)

✔️Answer:

(a) Basement membrane of cuboidal epithelium.
(b) Secretion and absorption.

3. The male and female cockroaches can be identified by the difference in their morphological features.

a. Name this phenomenon.
b. Give one external difference between males & females. (Score 2)

✔️Answer:

(a) Sexual dimorphism.
(b) Male cockroach: Narrow abdomen, Anal styles present. Female cockroach: Broad abdomen, anal styles absent.

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