Teachers recommend solving Kerala Syllabus Plus One Zoology Previous Year Question Papers and Answers Pdf Board Model Paper 2020 to improve time management during exams.
Kerala Plus One Zoology Board Model Paper 2020 with Answers
I. Answer any 3 questidns from 1-5. Each carries 1 score. (3 × 1 = 3)
Question 1.
The taxonomic aid used for identification of plants and animals based on the similarities and dissimilarities.
a) Manuals
b) Monogrpah
c) Key
d) Flora
Answer:
c) Key
Question 2.
Identify the given word pair relationship and fill in the blanks.
Cockroach – Malpighian Tubules
Amphioxus – _______
[Nephridia, Atennal glands, Green glands, Protonephridia]
Answer:
Protonephridia
Question 3.
In a protein molecule amino acids are linked by .
a) Glycosidic bond
b) Hydrogen bond
c) Peptide bond
d) Diester bond
Answer:
c) Peptide bond
Question 4.
In human being the sound is produced by
a) Pharynx
b) Larynx
c) Trachea
d) Bronchi
Answer:
b) Larynx
Question 5.
Pick the odd one out:
a) Pila
b) Nereis
c) Sepia
d) Loliga
Answer:
b) Nereis
II. Answer any 9 questions from 6 to 16. Each carries 2 scores. (9 × 2 = 18)
Question 6.
Observe the picture A and B.
a) Identify the tissues A and B.
b) Write any two features of A and B.
Answer:
a) A-Skeletal muscle or striated muscle
B-Smooth muscle or Non striated muscle
(b)
| Skeletal muscle | Smooth muscle |
| They have striated in appearance | They are smooth in appearance |
| They are voluntary muscle | They are involuntary muscles |
Question 7.
In an epithelium specialized junctions provide both structural and functional links between its individual cells. Identify any two types of cell junctions and their functions.
Answer:
1) Tightjunction
2) Gap junction
Tig ht junctions help to stop substances from leaking across a tissue. Gap junction helps the cells to communicate with each other by connecting the cytoplasm of adjoining cells and involved in rapid transfer of ions.
Question 8.
The mucus and bicarbonates present in gastric juice plays an important role in the protection of mucosal epithelium. Explain.
Answer:
The mucus and bicarbonates present in gastric juice protect the stomach wall from the action of HCI
Question 9.
Differentiate between
a) Apoenzyme and Coenzyme
b) Lyases and Ligases
Answer:
a) Apo enzyme : Protein part of the enzyme Co-enzyme : Non protein part of the enzyme
b) Lyases : Enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds.
Ligase: Enzymes catalysing the linking together of two compounds, e.g., enzymes which catalyse joining of C-O, C-S, C-N, P-0 etc. bonds.
Question 10.
Observe the picture.
a) Name the class to which this animal belongs.
b) Write any two characteristic features of this class.
Answer:
a) Class: Reptilia
b) i) They are mostly terrestrial animals and their body is covered by dry and cornified skin, epidermal scales or scutes ii) They do not have external ear openings.
Question 11.
a) Write any two enzymes present in succus entericus.
b) Write the functions of these enzymes.
Answer:
a) Maltase, Lactase
b) Maltase -It is involved in the conversion of maltose into two glucose molecules.
Lactase- It is involved in the conversion of Lactose into two glucose and Galactose.
Question 12.
a) What is normal respiratory rate?
b) Name an instrument used for measuring volume of air.
c) Mention its clinical significance.
Answer:
a) 12-16 times/minute
b) Spirometer
c) It is used to analyse the pulmonary function
Question 13.
Identify two wrong statements among the following and correct it.
a) Plasma without the clotting factors is called serum.
b) RBC is multinucleated in Human.
c) Neutrophils, Lymphocytes and Basophils are granulocytes.
d) Neutrophils and Monocytes are phagocytic cells.
Answer:
b) RBCs are devoid of nucleus
c) Neutrophils, eosinophils and basophils are agranulocytes.
Question 14.
a) Name any two synovial joints in our body,
b) Where is it located?
Answer:
a) Ball and socket joint, hinge joint
b) Ball and socket joint- It is located between humerus and pectoral girdle. Hinge joint It is located in knee joint
Question 15.
Fill up the table using appropriate terms.
| Glands | Hprmones | Disease |
| Pitutary gland | a) _____ | Diabetes insipidus |
| Pancreas | Insulin | b) _____ |
| c) _____ | Thyroxin | Cretinism |
| d) _____ | Growth Hormone | Dwarfism |
Answer:
a) Vasopressin
b) Diabetes mellitus
c) Thyroid gland .
d) Pituitary gland
Question 16.
ANF is a regulatory mechanism in kidney functioning,
a) Expand-ANF
b) Which part of the body secrete ANF?
c) Explain the regulatory mechanism.
Answer:
a) Atrial Natriuretic factor
b) Atrial wall of Heart
c) An increase in blood flow to the atria of the heart can cause the release of Atrial Natriuretic Factor (ANF). ANF can cause vasodilation (dilation of blood vessels) and thereby decrease the blood pressure. ANF mechanism acts as a check on the renin-angiotensin mechanism
III. Answer any 3 questions from 17 to 20. Each carries 3 scores. (3 × 3 = 9)
Question 17.
Observe the figure.
a) Identify the picture.
b) Label the parts A, B and C.
c) Write the function of D.
Answer:
a) Neuron
b) A – Dendrite
B – Cell body
C – Axon
C) Synaptic knob contains synaptic vesicles. Neurotransmitter in the synaptic vesicles helps to transmit impulse from one neuron to another across synaptic cleft.
Question 18.
This condition can be avoided by administering anti Rh anitbodies to the mother immediately after the delivery of the first child.
a) Identify this condition.
b) Write the reason for this condition.
c) Write the symptoms of the foetus born in this condition.
Answer:
a) Erythroblastosis foetalis
b) During the delivery of the first child, there is a possibility of exposure of the maternal blood (Rh- ve) to small amounts of the Rh + ve blood from the foetus. In such cases, the mother starts preparing antibodies (Rh antibodies ) against Rh antigen in her blood. In case of her subsequent pregnancies, the Rh antibodies from the mother (Rh-ve) can leak into the blood of the foetus (Rh + ve) and destroy the foetal RBCs . Hence anti-Rh antibodies are given to the mother immediately after the delivery of the first child.
c) It cause severe anaemia and jaundice to the baby.
Question 19.
“Metagenesis” is the charcteristic Phenomeon of this phylum.
a) Identify the phylum.
b) Write any four other characteristics of this phylum.
c) Give one example of this phylum.
Answer:
a) Phylum cnidaria or Coelenterates
b) 1) Cnidoblasts present in tentacles and the body are used for anchorage, defense and for the capture of prey
2) They exhibit two basic body forms called polyp and medusa
3) They have a central gastró-vascular cavity with a single opening, hypostome
4) They ar aquatic, marine and radially symmetrical animals
C) Physalia
Question 20.
Match the following :
| A | B |
| a) Tendon | i) Store fat |
| b) Columnar epithelium | ii) Fluid connective tissue |
| c) Bone | iii) Attach muscle to bone |
| d) Adipose Tissue | iv) Helps in secretion |
| e) Ligament | v) Support |
| f) Blood | vi) Attach bond to bone |
| vii) Secrete hormones | |
| viii) Conduct impulses |
Answer:
| A | B |
| a) Tendon | iii) Attach muscle to bone |
| b) Columnar epithelium | iv) Helps in secretion |
| c) Bone | v) Support |
| d) Adipose tissue | i) Store fat |
| e) Ligament | vi) Attach bone to bone |
| f) Blood | ii) Fluid connective tissue |