Teachers recommend solving Kerala Syllabus Plus One Zoology Previous Year Question Papers and Answers Pdf March 2023 to improve time management during exams.
Kerala Plus One Zoology Previous Year Question Paper March 2023
I. Answer any 3 questions from 1-5. Each carries 1 score. (3 × 1 = 3)
Question 1.
Name the enzyme that accelerate the following re-action:
Answer:
Carbonic anhydrase
Question 2.
The double walled membrane that protects the heart is _____.
Answer:
Pericardium
Question 3.
Scientific name of lion is given below. Which one is correctly written?
(a) Panthera leo
(b) panthera leo
(c) Panthera Leo
(d) panthera Leo
Answer:
Panthera leo
Question 4.
The disorder in which stone or insoluble mass of crystallised salts formed within the kidney.
Answer:
Renal calculi
Question 5.
Name the fluid filled space that separate the membranes of pre and post synaptic neurons at a chemical synapse.
Answer:
Synaptic cleft
II. Answer any 9 questions from 6 -16. Each carries 2 scores.
Question 6.
(a) Name the tissue that acts as pacemaker in human heart.
(b) What is the significance of pacemaker in the . functioning of heart?
Answer:
(a) Sino-atrial node / SAN
(b) SAN can generate the action potentials, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart.
Question 7.
Certain hormones that regulate Kidney function are
given in Column-A. Their specific functions are given in the Column-B. Match them suitably
| A | B |
| ADH | Water reabsorption |
| Angiotensin II | Powerfull Vaso Constrictor |
| ANF | Cause dilation of blood vessels |
| Aldosterone | Reabsorption of Na+ |
Answer:
| A | B |
| ADH | Powerfull Vaso Constrictor |
| Angiotensin II | Water reabsorption |
| ANF | Reabsorption of Na+ |
| Aldosterone | Cause dilation of blood vessels |
Question 8.
The processes involved in muscle contraction are given below. Arrange them in correct sequential order. (The first step is given correct).
• A signal sent out by CNS.
• Binding of Ca++ with troponin.
• Release of a neurotransmitter.
• Remove the masking of active sites for myosin.
• Release of Ca++ into Sarcoplasm.
Answer:
- A signal sent out by CNS.
- Release of a neurotransmitter.
- Release of Ca++ into sarcoplasm.
- Binding of Ca++ with troponin.
- Remove the masking of active sites for myosin.
Question 9.
Select Poiokilothermous animals from the list:
Corvus, Felis, Rana, Calotes, Scoliodon, Macaca, Hippocampus, Pavo.
Answer:
Poikilothermous Animals – Rana, Calotes, Scoliodon, Hippocampus
Question 10.
General structure of am.ino acid is given:
Draw the structure of the amino acids.
(a) glycine and
(b) Serine.
Answer:
Question 11.
(a) Write any two types of synovial joints.
(b) Identify its location.
Answer:
(a) Ball and Socket, Hinge joint, Pivot Joint, Gliding Joint, Saddle Joint
(b) Ball and Socket- Between humerus and pectoral girdle / Hip join
Hinge joint – Knee Joint
Pivot Joint – Between atlas and axis
Gliding Joint – Between carpals
Saddle Joint – Between carpal and metacarpal of thumb
Question 12.
Observe the illustration :
(a) Identify A & B and fill the blanks.
(b) What happens when the co-factor is removed from the enzyme ?
Answer:
(a) A-Apoenzyme.
B – Prosthetic group.
(b) Catalytic activity of enzyme is lost.
Question 13.
Observe the diagrammatic presentation of ECG.
(a) What is the expansion of ECG?
(b) What do P and QRS complex indicate?
Answer:
(a) Electrocardiogram
(b) P-wave represents the electrical excitation or depolarisationof the atria. QRS complex represents the electrical excitation or depolarisation of the ventricles.
Question 14.
Identify each phylum from the characteristics given :
(a) Comb plates are the locomotory organs.
(b) Show alternation of generation.
(c) Presence of Water Vascular System.
(d) Body consists of proboscis, collar and trunk.
Answer:
(a) Ctenophora
(b) Coelenterata/Cnidaria.
(c) Echinodermata.
(d) Hemichordata.
Question 15.
Observe the graph :
(a) What does the graph represent?
(b) Write any three conditions in the alveoli that favour the formation of oxy-haemoglobin.
Answer:
(a) Oxygen Dissociation Curve
(b) High pO2, Low pCO2, Lesser H+ ion concentration, Lower temperature
Question 16.
Write any two differences between Osteichthyes and Chondrichthyes.
Answer:
| Chondrichthyes | Osteichthyes |
| • All are marine fishes | • It includes both marine and fresh water fishes |
| • They have cartilaginous endoskeleton | • They have bony endoskeleton |
| • Mouth is ventral | • Mouth is terminal |
| • Gill slits separate without operculum | • Four pair of gills convered by operculum |
| • Skin contains placoid scales | • Skin is covered with |
| • Air bladder absent | • Air bladder absent |
III. Answer any 3 questions from 17 to 20. Each carries 3 scoers. (3 × 3 = 9)
Question 17.
Distinguish between :
(a) Nucleosides and Nucleotides
(b) Primary metabolites and Secondary metabolites
(c) Ligases and Lyases
Answer:
(a) Nucleosides-Pentose sugar + Nitrogenous base.
Nucleotides – Pentose sugar + Nitrogenous base + Phosphate group.
(b) Primary metabolites – The biomolecule directly involved in physiological activity.
Secondary metabolites – The biomolecule not directly involved in growth and development.
(c) Ligases – Catalyses the linking of two compounds.
Lyases – Catalyse the removal of group from substrate
Question 18.
Explain any two groups of organisms based on Coelom. Give one example for each group.
Answer:
- Acoelomates-Animals without coelom.
e.g:- Platyhelminthes. - Coelomates – Animals possessing true coelom. Eg :-Mollusca
Question 19.
Complete the illustration appropriately.
Name 3 layers of Cranial meninges that protects brain.
Outer layer (d) ________
Middle layer (e) _______
Inner layer (f) ________
Answer:
(a) Mid brain
(b) Cerebrum
(c) Cerebellum
(d) Dura mater
(e) Arachnoid
(f) Pia mater
Question 20.
(a) Name two types of cells in Islets of Langerhans.
(b) Write any one function of each type of cell.
(c) Name the gland where Islets of Langerhans found.
Answer:
(a) Alpha cells and Beta cells.
(b) Alpha cells – Produce Glucagon or Hyperglycemic hormone
Beta cells – Produce Insulin or Hypo-glycemic hormone
(c) Pancreas