You Will Not Be Allowed to Write During the First 15 Minutes

Guess Paper – 2013

Class – X

Subject-Biology

Marks: 80 ( 1 hr.30 min)

Answer to this paper must be written on the paper provided separately.

You will not be allowed to write during the first 15 minutes

This time is to be spent in reading the question paper.

The time given at the head of this paper is the time allowed for writing the answer.

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Section I-40 Marks

(Attempt all questions from this section )

Question 1

a .Define 5

1. Define antiseptic. Name an antiseptic.

2. Death rate

3. Population density

4. Stimulus

5. vaccine.

b. Differentiate between

1. Photosynthesis and respiration

2. Insulin and Glucagon

3. Myopia and Hypermetropia

4. Autotrophs and Heterotrophs.

5. Diffusion and osmosis

c. Fill in the blanks.

1. The addition of new individuals to the population from other localities is called -----

2. The testes are concerned with the formation of male gametes the process is called ------

3.The condition opposite to turgid is ------

4.Meiosis occurs in ------

5.Splitting of water results in the release in the -----

d. Give scientific reasons.

1. Some plants show wilting of their leaves during mid day even when the soil is well watered.

2. There are two kinds of Diabetes related with two different hormones.

3. Transpiration is an essential evil.

4. . Why resources cannot keep pace with the rising population ? Give two examples.

5.In humans circulation is called double circulation.

e. Give the functions of

1. Renal artery

2. Cones

3. Loop of Henle.

4. Cowper's gland

5. Eardrum

f. Name the following 5

1. The chemical substances obtained from certain micro-organisms that destroy harmful

microbes.

2. An apparatus to compare the rate of transpiration in cut shoots.

3. Receptor cells in the eye concerned with colour vision:

4. The kind of cell division normally seen at the tip of root and shoot system.

5. The phase of the cardiac cycle in which the auricles contract.

g. odd one out

1. Pons, cerebellum, medulla oblongata, cerebrum.

2. Steroids, cortisone, testosterone, adrenalin, prolactin.

3. GH,TSH,FSH,LH,ADH

4. Pleura, pericardium, meninges, spinal cord.

5. TAB, BCG, DPT, WHO

h. State true or false5

1. Photosynthesis results in the loss of dry weight of the plant.

2. Spreading of particles by mixing is called diffusion.

3. Cytokinesis is a division of cytoplasm.

4.Light dependant reactions of photosynthesis occur in stroma of chloroplast.

5. The genetic make up of an organism is called phenotype.

Section- II (40 Marks)

(Attempt any 4 questions from this section )

Question 2

a. The following diagram represents the ventral view of the female reproductive system : (5m)

(i) Label the parts indicated by guidelines 1 to 8 (1)

(ii) How does the uterus prepare for the reception of a zygote ? (1)

(iii) What happens to the uterus if fertilization takes place ? (1)

(iv) What happens to the uterus if fertilization has failed to take place ? (1)

(v) Name the fully developed part of ovary containing the ovum. (1)

b. Enlist the health hazards of noise pollution . (5)

Question 3

a. Answer the following questions (5)

i] Name two surgical methods that can be used to prevent pregnancy.

ii] Give two advantages of a small family .

iii] Define Natality and Mortality.

b. Given below is the simplified pathway of the circulatory system of man: (5)

a.Name the blood vessels marked 1 to 8.

b.Name the chamber of the heart which:

1. receives blood from '1', 2. pumps blood into blood vessel '8'.

c.Mention two structural differences between blood vessels '7' and '2'.

Question 4

a. Match the column A with column B.(5)

Column A Column B

1.Dark phase a] Allosomes

2.Centrioles b] Xylem

3.Sex chromosomes c] Glucose production

4.Chlorophyll synthesis d] Dominant

5.Conduction of water e] Aster

f] Autosomes

g] Magnesium

h] Phloem

i] Calcium

b. The diagram below represents a simple reflex pathway in a human being: study the diagram andanswer the questions:

Questions:

1] Label the parts marked by guideline A to D.

2] Define reflex action.

3] Give two examples of reflex action performed in our daily life.

4] What is conditioned reflex action?

Question 5(5)

a. Draw a neat labeled diagram of the experimental set up to show that green plants give out oxygenduring photosynthesis.

b. Write briefly about :

(i) Exophthalmic goiter (Symptoms and cause).

(ii) Diabetes mellitus (Symtoms and cause).

Question 6 (5)

Make a punnett square for finding out the proportion of different genotypes in the progeny ofa monohybrid cross between pea plants having red color & white color flowers.

b.Answer following questions. (5)

i] Define transpiration.

ii.List any two advantages of transpiration to a plant.

iii.Briefly explain how the rate of transpiration is affected by:-

a. intensity of light,

b. humidity of the atmosphere.

Question 7

Given below is the diagram of excretory system Observe the diagram & answer the question (5)

1] Label The parts .

2] Explain the functions of each part in detail

b .The following diagram is that of a human brain. Guidelines 1 to 5 indicate different parts of the surface ofthe brain and these are as follows: (5)

1. Frontal lobe of cerebrum.

2. Temporal lobe of cerebrum.

3. Occipital lobe of cerebrum.

4. Cerebellum.

5. Medulla oblongata.

Study the diagram and answer the following questions :

I. What handicaps would result from :

(i) Damage to part numbered 3 ?

(ii) Damage the part numbered 4 ?

II Mention one main function of each of the parts numbered 1, 2 and 5.