Plus One Zoology Model Question Papers Paper 4

Plus One Zoology Plus One Zoology Model Question Papers Paper 4 is part of Plus One Zoology Previous Year Question Papers and Answers. Here we have given Plus One Zoology Model Question Papers Paper 4.

Plus One Zoology Model Question Papers Paper 4

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

Questions 1-3. Answers all questions. Each question carries 1 score.

Question 1.
Choose the correctly matched pair.

a. Neries – False segmentation
b. Taenia – True segmentation
c. Ascaris – No segmentation

Question 2.
In human beings dentition is ‘heterodont’.
This condition means ………
a. presence of two types of teeth.
b. presence of two sets of teeth.
c. presence of different types of teeth.
d. teeth are placed in sockets of jaw.

Question 3.
The diagram given below is a simple epithelium. Name the part marked as “P” in the figure.

Questions 4-14. Answers any 9 questions. Each question carries 2 score.

Question 4.
Match column B and C with column A.

Question 5.
Figure A and B are the fishes of two different classes. Identity and differentiate between these classes.

Question 6.
Observe the following figure. No need to redraw the diagram.

a. Label the parts, A and B.
b. Write the function of ‘B’

Question 7.
Complete the following sentence using appropriate words.
a ………….. hormone controls the diurnal (24 hours) rhythem.
b. Insulin controls ………. level of blood.

Question 8.
“A contracted muscle becomes shorter and thicker but its volume remains the same.”
a. Which theory explains the process of muscle contraction?
b. Identify two contractile proteins seen in muscle.

Question 9.
Where do you find the following structures in a human body ?
a. Collagen fibres
b. Axons
c. Squamous epithelium
d. Smooth muscles

Question 10.
Name the chemical bonds formed between the following :
a. Amino acids in a protein molecule.
b. Sugar and phosphate in nucleic acids.

Question 11.
‘‘All vertebrates are chordates but all chordates are not vertebrates”. Evaluate and substantiate the statement.

Question 12.
Blood transports CO₂ from tissues to lungs by various means. Mention any two methods of the same.

Question 13.
ln a 400 metre race competition, Athira won the first place. Her friends commented that it is due to her high vital capacity.
a. What do you understand by the term vital capacity?
b. Suggest the ways to improve the vital capacity.

Question 14.
Red muscle fibers have greater capacity to do work for a prolonged period, whereas white muscle fiber suffer from fatigue after a short work. Evaluate the statement.

Questions 15 – 18. Answers any 3 questions. Each question carries 3 scores.

Question 15.
Observe the graph.

a. Identify the partial pressure of oxygen where 50% of saturation of Hb with oxygen.
b. Mention the factors favourable for the formation of oxyhaemoglobin in alveoli.

Question 16.
Following is a schematic representation of an action.

Question 17.

a. Label PQRST in the graph.
b. What does the T wave represent?

Question 18.
Write the functions of parts 1 and 4. Label the parts 2 and 3 in the following figure showing a synapse. (No need to copy the picture.)

ANSWERS

Answer 1.
c

Answer 2.
c. presence of different types of teeth.

Answer 3.
Basement membrane

Answer 4.

Answer 5.
A – Chondrichthyes (Cartilagienous fishes)
B – Osteichthyes (Bony fishes)

Answer 6.
a. A. Nucleus
B. Inter calated disc.

b. Pass the signals to adjacent cells for the contraction of cells as a unit.

Answer 7.
a. Melatonin
b. Glucose

Answer 8.
a. Sliding filament theory
b. Actin and Myosin

Answer 9.
a. Collagen fibres – Connective tissue
b. Axon – Neuron
c. Squamons epithelium – Walls of blood vessels.
d. Smooth muscle – Visceral organs

Answer 10.
a. Peptide bond
b. Phospho diester bond

Answer 11.
Vertebrates are chordates with vertebral column, there are chordates without vertetral column. Notochord is present in all vertebrates but vertebral column is present only in vertebrates and not in all chordates.

Answer 12.
CO₂ transport by plasma and as bicarbonate in plasma.

Answer 13.
a. Vital capacity is the maximum volume of air a person can breath in after a forced expiration.
b. Regular exercise, avoid smoking, practice yoga.

Answer 14.
Red muscles contain large amount of nitrogenious which can use large amou-nt of oxygen stored in them.

Answer 15.
a. 30 mm Hg
b. High partial pressure of oxygen, low partial pressure of CO₂, low H⁺ concentration, low temperature.

Answer 16.
a. Afferent neuron, motor neuron, effec tor organ.
b. Sudden withdrawal of hand when if touches a hot body.

Answer 17.

b. Repolarisation of ventricle or relaxation of ventricle.

Answer 18.
1 – Axon : Transport impulse form cell body to synaptic knob.
4 – Neurotransmitter : Help in the transport of impulse across synapse.
2 – Syneptic vesicle :
3 – Synaptic cleft

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