Solved Sample Paper 4

Question 1(i)

Adrenaline is a 'stress hormone' found in humans similarly the 'stress hormone' of plant is

1. ethylene
2. abscisic acid
3. cytokinins
4. auxin

Question 1(ii)

Area of best vision and contains maximum cone cells

1. Blind spot
2. Red spot
3. Blue spot
4. Yellow spot

Question 1(iii)

Chlorophyll is required in leaves for

1. splitting of water in hydrogen and oxygen
2. trapping sunlight
3. storing food
4. emitting light

Question 1(iv)

The first heart sound (Lubb) is produced due to

1. closure of tricuspid and bicuspid valves
2. closure of aortic and pulmonary valves
3. rushing of blood through valves producing turbulence
4. entry of blood into auricles

Question 1(v)

The accidental discharges of petroleum in oceans or estuaries are

1. industrial waste
2. oil spills
3. oil waste
4. liquid spills

Question 1(vi)

Assertion (A) An average adult have about 5-6 litres of blood by volume in his body.

Reason (R) The main functions of the blood in our body are transportation and protection.

1. Both A and R are true
2. Both A and R are false
3. A is true and R is false
4. A is false and R is true

Question 1(vii)

Main reason for sharp rise in world human population in the recent past

1. Poor health care
2. Improved nutrition
3. More deaths
4. Small scale immunisation

Question 1(viii)

In human females, 23rd pair of chromosome is

1. XY
2. XX
3. Both XX and XY
4. Neither XX or XY

Question 1(ix)

Which of the following blood vessels is comprised of thick walls and narrow central lumen?

1. Vein
2. Venule
3. Artery
4. Capillary

Question 1(x)

Maximum amount of water from the glomerular filtrate is reabsorbed in

1. PCT
2. descending limbs of loop of Henle
3. ascending limbs of loop of Henle
4. DCT

Question 1(xi)

Harish went to the beach for vacation of 2-3 days. After coming home he noticed his skin tone has darkened. This was due to

1. melanin
2. rhodopsin
3. thyroxine
4. serotonin

Question 1(xii)

Maximum transpiration in plant takes place from

1. stomata
2. cuticles
3. lenticels
4. root hairs

Question 1(xiii)

Injury to the medulla generally results in death. Which of the following reasons support this statement?

P. It controls the activities of the internal organs.

Q. It control involuntary actions like salivation, vomiting, movement of breathing, beating of the heart.

R. It is the main thinking part of the brain.

1. Only P
2. Only Q
3. Only P and Q
4. Only P and R

Question 1(xiv)

The external female genitalia is called the

1. hymen
2. uterus
3. vagina
4. vulva

Question 1(xv)

After coming from school, Rita wants to watch some programme on TV. She switch it on and press the remote for a particular channel.

Which of the following is/are involved in the process described above?

(a) Cerebrum
(b) Cerebellum
(c) Skeletal muscles
(d) Medulla oblongata

1. Only c
2. Only a and c
3. Only c and d
4. Only b, c and d

Question 2(i)

Name the following.

(a) General name of chemical substances which bring about control and coordination in plants.

(b) The kind of lens required to correct myopia.

(c) The prime source of chlorofluorocarbon is

(d) The chromatin material is formed of

(e) A pollutant which is mainly responsible for causing acid rain.

Question 2(ii)

Arrange and rewrite the terms in each group in the correct order so as to be in a logical sequence beginning with the term that is underlined.

(a) Ureter, Kidney, Renal artery, Urinary bladder

(b) Intestine, Intestinal artery, Hepatic portal vein, Liver

(c) Right auricle, Pulmonary artery, Vena cava, Right ventricle

(d) Sperm duct, Sperm, Vagina, Urethra, Coitus.

(e) Fertilisation, Gamete formation, Embryo, Zygote.

Question 2(iii)

Fill in the blanks with suitable words.

The loss of excess water in the form of drops along the (a) ............... due to excessive (b) ............... is called guttation. In certain plants, like (c) ............... , grass etc. the root pressure is high enough to force the water all the way through the (d) ............... and comes out through the ends of (e) ............... .

Question 2(iv)

Choose the odd one out from the following terms and name the category to which others belong.

(a) Genotype, Phenotype, Allotype, Mutation

(b) White matter, Duramater, Arachnoid matter, Piamater

(c) Addison's disease, Cushing's syndrome, Adrenal virilism, Cretinism.

(d) Mining, Stone drilling, Wearing of rubber tyres, Noise of jet

(e) Cortisol, Aldosterone, Androgen, Epinephrine

Question 2(v)

Match the items given in Column I with the most appropriate ones in Column II and rewrite the correct matching pairs.

Question 3(i)

When a black coloured guinea pig is crossed with a white coloured guinea pig. What coloured obtained in F₁ generation if black colour is dominant over white?

Question 3(ii)

Mention two functions of placenta.

Question 3(iii)

What are differences between allosomes and autosomes?

Question 3(iv)

There is a need to check over-exploitation of resources. Explain.

Question 3(v)

Draw a neat and labelled diagram showing the cross-section of an adrenal gland.

Question 4(i)

Mention the exact location of chordae tendinae.

Question 4(ii)

Give two control measures of noise pollution.

Question 4(iii)

Explain systemic circulation.

Question 4(iv)

Differentiate between embryo and foetus.

Question 4(v)

Draw a well labelled diagram of TS of artery and vein.

Question 5(i)

Define alleles.

Question 5(ii)

After examining a prepared slide under high power microscope, a student concludes that the given slide shows stage of mitosis. Write his observation on the basis of which this conclusion can be drawn.

Question 5(iii)

Explain Darwin theory of 'Natural selection'.

Question 5(iv)

'A' forms the outer portion of the kidney and 'B' form the inner portion of the kidney. Name A and B.

Question 5(v)

Study the diagram given below and answer the questions that follows.

(a) Name the parts labelled 1, 2 and 3 in the diagram.

(b) Mention the collective terms for the membranes covering the brain.

(c) What is the function of cerebrospinal fluid?

Question 6(i)

Given the exact location of interstitial cells.

Question 6(ii)

Give differences between passive transport and active transport.

Question 6(iii)

What is hydrotropism? Give one example.

Question 6(iv)

Make a Punnett square for finding out the proportion of different genotypes in the progeny of a genetic cross between a pure tall (TT) pea plant with a pure dwarf (tt) pea plant.

Question 6(v)

An outline sketch of a tree is shown in a diagram below. Study the same and answer the questions that follows.

(a) Name the phenomenon labelled A in diagram.

(b) Explain phenomenon 'A'.

(c) Give one significance of phenomenon 'A'.

Question 7(i)

Expand TSH.

Question 7(ii)

Briefly explain the diencephalon.

Question 7(iii)

What are main objectives of family welfare programme?

Question 7(iv)

Give difference between transpiration and guttation.

Question 7(v)

The diagram given below shows a type of tropism. Answer the questions that follows.

(a) What do A and B indicate?

(b) Name the tropic movements shown by parts A and B.

(c) Why do A and B show these types of movement?

Question 8(i)

Define corpus callosum.

Question 8(ii)

Name the two genetic disorders in males caused due to sex-linked inheritance.

Question 8(iii)

State two harmful effects of soil pollution.

Question 8(iv)

Rate of photosynthesis is low at very high temperature. Mention reason.

Question 8(v)

Given below is a diagram representing a stage during the mitotic cell division. Answer the following questions.

(a) Identify the stage.

(b) Give suitable reason for your answer in (a).

(c) What changes are observed with chromosomes during stage shown in diagram?