Federal Board Class X Biology

SECTION “A”

Q.1. Insert the correct option. (17)

i. Which type of pollution level can’t be measured by Biological Oxygen Demand (BOD)?

• Air Pollution
• Water Pollution
• Soil Pollution
• Noise Pollution

ii. Different methods / processes of movement of molecules are listed below. Which one of the following takes place with the help of carrier proteins according to principle of concentration?

• Osmosis
• Active transport
• Diffusion
• Facilitated diffusion

Colour blindness is a sex linked character in human beings and the gene for it lies on x-chromosome. What is the probably of having a colour blind son if the mother is normal but father is colour blind.

• 0.00
• 0.252
• 0.50
• 0.75

iii. Which of the following character is NOT present in water pollinated flowers?

• Flowers are small
• Pollen grains float under water
• Filaments of stamens are short
• They produce nectar

v. Which of the following plant hormones is considered as a growth inhibitor?

• Abscisic acid
• Auxins
• Cytokinens
• Gibberellins

vi Evolution is a natural process. Who proposed the concept that evolution is due to mutation and not by gradual process?

• Charles Darwin
• Alfred Wallace
• Charles Lyell
• Hugo de Vries

vii. Development of frog is a complex and lengthy process which is completed in four phases. Which one of the following is the correct sequence of development phase.

• Cleavage → Blastulation → Gastrulation → Neurulation
• Cleavage → Neurulation → Blastulation → Gastrulation
• Blastulation → Gastrulation → Neurulation → Cleavage
• Gastrulation → Cleavage → Blastulation → Neurulation

viii. Each cerebral hemisphere is divided into four lobes. Which lobe is primarily concerned with hearing?

• Occipital
• Temporalic
• Frontal
• Parietal

ix. A lion kills a deer and eats its flesh. Which types of relationship exists between them?

• Mutalism
• Parasitism
• Commensalism
• Predator-Prey

x. Rate of transpiration is affected by various factors . Which of the following factor. If increased, will decrease the rate of transpiration?

• Temperature
• Humidity
• Light
• Wind

xi. Which of the following joints allows movement in three direction i.e. forward backward and sideways?

• Finger joints
• Vertebrate joints
• Elbow joints
• Shoulder joints

xii. Plants need minerals for various functions. Which of the following elements is a part of Chlorophyll?

• Calcium
• Potassium
• Phosphorus
• Magnesium

xiii. Which of the following groups reproduces only be Asexual method of reproduction?

• Bacteria
• Cyanobacteria
• Algae
• Fungi

xiv. Flower is the most beautiful part of plant. Brassica flowers grow on young branches. What are known as?

• Petiole
• Peduncle
• Pedicel
• Inflorescence

xv. Leaves are of two types i.e. simple and compound leaves. Which of the following plants has compound leaf?

• Cotton
• Mulbery
• Peepal
• Amaltas

SECTION “B”

Q.2. Attempt all the questions. (42)

i. Plastic are present in plant cell. Write the names of various types of plastids and one function of each.

OR

Write a note on the structure, types and functions of Endoplasmic reticulum.

ii. (a) What is Osteoarthritis? Write its causes.
ii. (b) What is meant by dislocation of joints?

iii. Define the terms and write one example of each
(a) i. Autotrophic thallophytic, ii. Heterotrophic thallophytic.
(b) What is meant by mutaalists?

iv. (a) Write one function of each structures.
i. Somniferous tubules, ii. Vasa efferntia
(b) In male from why is ureter called urinogenital duct?

v. Describe the process of transport of food in plants.

OR

Describe the experiment by which the rate of transpiration can be measured in laboratory.

vi. Measles in an infectious disease.
Write the following about this disease.
(a) Symptoms (Two), (b) Causative organism, (c) Treatment and control

vii. Sickle cell anemia is a hereditary disease. The allele for normal hemoglobin is Hb A and for sickle cell hemoglobin is Hb S.
Write the genotype of the following persons.
(a) A healthy person, (b) A patient of sickle cell anemia, (c) A sickle cell carrier

viii. Define continuous variation and discontinuous variation.
What is a test cross? How does it help to determine the genotype of an organism?

ix. Hormones control various functions in an animal body. Certain functions are listed in the table. Write the names of hormones which control these functions and the names of endocrine glands which produce that hormone.
(a) Increases glucose level in blood, (b) Decrease glucose level in blood, (c) Helps in the development of male secondary sexual characters, (d) Stimulate the thyroid gland.

OR

Define the following terms

Karyotype
Gehome
Homologue
Phenotype

x. (a) How are Nitrogenous waste products and water removed in a cockroach?
x. (b) What is lithotripsy?

xi. Why is it that the organism at the end of the food chain does not get as much amount of energy as is present at the first trophic level?

xii. Write the names of two harmful chemical present in cigarette smoke and one effect of each of them.

xiii. Write down the structure of blood capillaries.

OR

What is heart attack? Write two possible reasons of it.

SECTION “C”

NOTE: Attempt any two questions. (26)

Q.3. (a) Describe the structure of human eye with the help of a diagram.
Q.3. (b) What is the cause of near sightedness?
Q.3. (c) How is night blindness different from colour blindness.

Q.4. (a) Describe the process of digestion of food in stomach and small intestine of man.
Q.4. (b) Write the cause of tooth decay and its prevention.
Q.4. (c) Why should our daily food requirement vary with age, sex and occupation of man?

Q.5. (a) With the help of a diagram describe the Nitrogen Cycle.
Q.5. (b) Describe the role of biotic components in the Ecosystem.