Plus One Zoology Model Question Paper 5

Kerala Plus One Zoology Model Question Paper 5

Time: 1 Hours
Cool off time : 10 Minutes
Maximum : 30 Scores

General Instructions to candidates :

• There is a ‘cool off time’ of 10 minutes each for Botany and Zoology in addition to the writing time of 1 hour each. Further there is a ‘ 5 minutes’ ‘preparatory time’ at the end of the Botany Examination and before the commencement of the Zoology Examination.
• Use the ‘cool off time’ to get familiar with the questions and to plan your answers.
• Read the instructions carefully.
• Read questions carefully before you answering.
• Calculations, figures and graphs should be shown in the answer sheet itself.
• Malayalam version of the questions is also provied.
• Give equations wherever necessary.
• Electronic devices except non programmable calculators are not allowed in the Examination Hall.

QUESTIONS

Answer all questions from question numbers 1 to 3. Each carry one score. (3 × 1 = 3)

Question 1.
Find out the pseudocoelomate animal from the following :
Tapeworm, Hookworm, Earthworm, Honey bee.

Question 2.
Identify the word pair relation and fill the blanks :
a. Fish : ammonotelic :: Cockroach : ……………..
b. Bone : Osteocytes :: Cartilage : ……………..

Question 3.
ICZN stand for

a. InternationalCouncilofZoologicalNome- nclature.
b. Indian Council of Zoological Nomenclature
c. International Code of Zoological Nomen-clature
d. Indian Code of Zoological Nomenclature

Answer any nine from question numbers 4 to 14 Each carries two scores.

Question 4.
Certain disorders and their causes are given. Match them suitably.

Question 5.
“In the tissues, the conditions are favourable for dissociation of oxygen from the oxyhae- moglobin”. Write any four favourable condi¬tions in the tissues for the dissociation of O₂ from oxyhaemoglobin.

Question 6.
a. Classify the given organisms under the heading poikilothermous and homoio-thermous.
Rats, Frog, Dog fish, Ostrich
b. Define the terms poikilithermous and – homoiothermous.

Question 7.
Classify the given hormones in the table. Prolactin, Oxytocin, Leutinising hormone,Vasopressin.

Question 8.
a. Identify the organism,

Question 9.
Fill in the blanks suitably.
In a protein, aminoacids are linked by (a) ……………… bond. In a polysacchharides are linked by (b) ………….. bond.

Question 10.
In (A) ………………… type synapse the membrances of presynaptic and post synaptic neurons are in very close proximity.
In (B) ………………… type synapse the membrances of pre and post synaptic neurons are sepa¬rated by a afluid filled spaces
a. Name the types of synapse A and B.
b. Name the fluid filled space in the synapse B.

Question 11.
Certain indicators regarding the layers in the wall of alimentary canal are given. Name the layers against the indicator.
a. Formed of loose connective tissues containing nerves and blood vessels.
b. Innermost lining forms rugae in the stomach.
c. Formed by smooth muscles.
d. Outermost layer made of mesothelium.

Question 12.
“The functioning of the kidneys is efficiently monitored and regulated by the heart to a certain extent”.
Do you agree with this statement ? Justify your answer.

Question 13.
How does the increased level of Ca⁺⁺ in the sarcoplasm help in muscle contraction ?

Question 14.
a. Write the significance of reabsorption in urine formation.
b. Of the following substances which one is reabsorbed by active transport ? Glucose, Nitrogenous waste, Water.

Answer any three from question numbers 15 to 18. Each carries three scores.

Question 15.
a. Effect of change in concentration of substrate on enzyme activity is graphically represented. After reaching a maximum velocity (Vmax), the reaction is not exceeded by any further rise in concentration of substrate. Explain.

b. Mention any 2 other factors that affect enzyme activity.

Question 16.
Identify the figures A and B. Write any one characteristic features of each A and B.

Question 17.
Fill the blanks suitably.

Question 18.
Redraw the diagram. Name and label the parts indicated below.

ANSWERS

Answer 1.
Hookworm

Answer 2.
a. Uricotelic
b.Chondrichthyes

Answer 3.
c

Answer 4.

• Myasthenia gravis – Auto-Immune disorder
• Tetany – Low Calcium ions in body fluid
• Muscular dystrophy – Genetic disorder

Answer 5.
The factors favourable for the dissociation of O2 from the oxyhaemoglobin in the tis- 7. sues are,

• Low pO₂
• High pCO₂
• High H⁺ concentration
• Higher temperature

Answer 6.
a

Poikilothermous (Cold-blooded)	Homoiothermous (Warm-blooded)
Frog	Ostrich
Dog fish	Rat

b. Poikilothermous : They are cold-blooded, they lack the capacity to regulate body temperature.
Homoiothermous : They are warm-blooded animals, ie., they are able to maintain constant body temperature.

Answer 7.

Released from adenohypophysis	Released from neurohypophysis
Prolactin	Oxytocin
Leutinising hor­mone	Vassopressin

Answer 8.
a. Hippocampus
b. Class – Osteichtyes
c. Endoskeleton is bony
Exoskeleton is formed of cycloid & cten-oid scales.
Both marine & fresh water forms

Answer 9.
a – peptide bond
b – glycosidic linkage

Answer 10.
a. A – Electrical synapse
B – Chemical synapse
b. Synaptic cleft

Answer 11.
a. Submucosa
b. Mucosa
c. Muscularis
d. Serosa

Answer 12.
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, therefore, acts as a check on the rennin angiotensin mechanism.

Answer 13.
Action potential stimulates sarcoplasmic reticulum to release Ca²⁺. The Ca²⁺ binds with troponin of actin filaments. This causes conformational changes in the troponin molecule and expose the active sites on the fibrous actin molecules. These sites are specific to the myosin heads, which exhibits Mg²⁺ dependent ATPase activity. Myosin ATPase is normally inactive, but it become active only when myosin head combines with the actin. The energy released by the splitting of ATP by head combines with the actin. The energy released by the splitting of ATP by ATPase is used for cross bridge movement. At the time of relaxation, Ca²⁺ pumped back into sacroplasmic reticulum. As a result, the troponin molecule become free to mask the active sites.

Answer 14.
a.

• The process of absorption of selected materials from the filtrate into the blood of peritubular capillaries or vasa recta is termed as reabsorption.
• Even though 180 litres of glomeru¬lar filtrate is produced daily, about 99% of this is reabsorbed by the renal tubules.
• Normal volume of urine released -1.5 litres per day.

b. Glucose

Answer 15.
a. Increase in substrate concentration increases the rate of the reaction. The reaction reaches maximum velocity (V_max). It is not exceeded by any further rise in substrate concentration. At this stage the enzyme molecules are fully saturated. Noactivesite is left free to bind with additional substrate molecule.
b. Temperature and pH.

Answer 16.
A – Smooth muscle tissue
B – Skeleton muscle tissue
A – Striations are present, spindle-shaped
B – Long and cylindrical

Answer 17.
a. – Granulocytes
b – Basophyl
c – Monoxytes
d – Lymphocytes
e – Resist infections and associated with allergic reactions.
f – Responsible for the immune response of the body.

Answer 18.

Plus One Chemistry Previous Year Question Papers and Answers