Rawalpindi Board 2017
Biology
PART -2
Time: 30 Minutes
Group 1
Note: Write answers to the questions on the objective answer sheet provided. Four possible answers A, B, C and D to each question are given. Which answer you consider correct, fill the corresponding circle  A, B, C and D given in front of each question with Marker or pen ink on the answer sheet provided.
A.  Choose the right option if the under-lined words. (Book-I: Short Stories; Book-III: Plays, Poetry)        

• The category of plants that has adaptation of small and thick leaves to limit water loss is called:

(A) Hydrophytes
(B) Xerophytes
(C) Mesophytes
(D) Aygrophytes

• The reabsorption of water in collecting tubules is under the control of:

(A) Aldosterone
(B) ADH
(C) Tubular secretion
(D) Pressure fiteration

• Turgor pressure is generated by osmotic pressure of:

(A) Cell cytosol
(B) Cell vacuole
(C) Cytoplast
(D) Cytoplasm

• Skeletal muscles are called striated (stripped) because of presence of:

(A) Red and Yellow band
(B) White and yellow band
(C) Alternating dark and light band
(D) Red and black band

• Fruit ripening is associated with the burst of respiratory activity called:

(A) Glycolysis
(B) Respiration
(C) Krebs cycle
(D) Climacteric

• Evolution of pollen tube parallels the evolution of:

(A) Embryo
(B) Leaf
(C) Fruit
(D) Seed

• Each chromosome when visible consist of two unseparated replicas:

(A) Chiasma
(B) Tetrad
(C) Homologus chromosome
(D) Chormalids

• The sex chromosomes of the person affected with klinefelter's syndrome are:

(A) SYY
(B) XXX
(C) XXY
(D) XY

• Neuroglial cells provide the neuron with:

(A) Protection
(B) Support
(C) Locomotion
(D) Nutrition

• Apical dominance in plants occur due to higher concentration of:

(A) Cytokinin
(B) Gibberellin
(C) Ethane
(D) Auxin

• Number of histone protein molecules in a single nucleosome are:

(A) 06
(B) 09
(C) 08
(D) 10

• Deutranopia is a colour blindness of:

(A) Red
(B) Blue
(C) Green 
(D) Yellow

• First restriction enzyme was isolated by:

(A) Kary Mullis
(B) Hamilton
(C) Sanger 
(D) Mendel

• Endosymbiont hypothesis was proposed by:

(A) Cuvier
(B) Lyell
(C) Lynn Margulis
(D) Malthus

• Who proposed the term niche in ecology:

(A) Haeckel
(B) Darwin
(C) Charles Eton
(D) Josph Grinnel

• Alpine coniferous forest are found on high:

(A) Latitudes
(B) Longitudes
(C) Altitudes
(D) Slopes

• The decline in thickness of ozone layer is caused by increasing level of:

(A) Hydrocarbon
(B) Nitro carbon
(C) Chlorofluorocarbon
(D) Chlorine

SUNJECTIVE PART
SECTION B

2. Attempt any eight parts.

1. Draw labeled sketch of urea cycle.
2. What is metanephridium? In which organism is it found?
3. What is lithotripsy? Name its common type.
4. Define secondary growth and give its significance.
5. Give two disadvantages of exoskeleton.
6. Describe main types of cartilage.
7. Explain briefly the term "Fruit Set".
8. Differentiate between identical twins and fraternal twins.
9. Describe the animal life in Profundal zone.
10. How animals and plants conserve water in terrestrial environment?
11. What are causes of greenhouse effect?
12. Differentiate pollution from pollutant.

3. Attempt any eight parts.

1. What is latent learning? Give an example.
2. Define habituation with an example.
3. Elaborate action of nicotine on humans.
4. Differentiate between gene and allele.
5. What is the difference between linkage and linkage group?
6. How sex is determined in yeast?
7. Give two practical uses of DNA printing technology.
8. Differentiate between cloning and tissue culture.
9. How hypercholesterolemia can be cured by gene therapy?
10. Define population and community.
11. Define the term biochemistry cycle.
12. What is parasitism? Give its kinds.

4. Attempt any six parts.

1. Differentiate between heterochromatin and euchromatin.
2. What is alraptonuria.
3. Describe semi-conservative model of DNA replication.
4. Define discoidal cleavage.
5. What is malignant tumor?
6. Discuss diakinesis phase of meiosis.
7. Differentiate between homologous and analogous organs.
8. Name four declared extinct animals in Pakistan.
9. How temperature plays important role in the growth of plants? Discuss.

SECTION C

NOTE: - Attempt any three questions.

Q 5.
(a) Describe the structure and functions of Nephron.
(b) Explain the various stages of xerosene succession on land.

Q 6.
(a) Discuss methods of locomotion in fish and mammals.
(b) What is genetic code? Explain it in detail.

Q 7.
(a) Define reflex-Arc. Explain reflex Arc with an example.
(b) Write an explanatory note on, Degradation and depletion of resources.

Q 8.
(a) Describe four sexually transmitted diseases.
(b) What is incomplete dominance? Explain it with a suitable example.

Q 9.
(a) Discuss the role of Nucleus in development.
(b) Write a detailed note on comparative anatomy as evidence of evolution.