30/08/09 Question Paper

X- ICSE BIOLOGY Ist MID-TERM EXAM
(CELL,CELL DIVISION,GENETICS,ABSOPRTION BY ROOTS,TRANSPIRATION,PHOTOSYNTHESIS,NERVOUS SYSTEM-SENSE ORGAN  MM 80

SECTION-A

1. Name the following:- (5 marks)

a. Adenine always links with.

b. Brain behind cellular activities.

c. The stage of mitosis where chromosomes are arranged at the equator.

d. The lens used to correct short-sightedness.

e. Homozygous individual formed by the parents with identical characters and breed true to the species at least for 3 consecutive generations.

2. Fill in the blanks:- (5 marks)

a. Phenotypic dihybrid ratio is ______________ in F2 generation.

b. 97% of total transpiration takes place through _____________.

c. Meiosis produces----------- number of daughter cells

d. The ear ossicle in contact with the oval window is…………………

e. The site of light reaction is_________________.

3. Give reasons for the following:- (4 marks)

a. Mendel selected pea plant for his experiment.

b. Meiosis is needed for maintaining the chromosome number in species.

c. Watering or production of saliva on hearing the name of the tasty foods

d. The first stage of photosynthesis is called photphosporylation.

4. Name the following: (5 marks)

a. The fundamental unit of heredity

b. Longest cells in human body

c. The membranous covering the human brain

d. Cell division leading to the growth and development

e. Between two divisions when cell in the resting or not dividing phase is called

5. State the difference in n each of the following pairs on the basis of what is indicated in brackets:- (4 marks)

a. Mitosis and Meiosis [chromosome number in each daughter cell]

b. Myopia and Hypermetropia [corrective measures]

c. Cranial and Spinal nerves [total number of pairs in adult]

d. Autosomes and sex chrosomes [total number of pairs in man)

6. Define following terms : - (5 marks)

a. Capillarity

b. Plasmolysis

c. Root pressure

d. Semi-permeable membrane

e. Mutation

7. Given below is incomplete explanation of certain biological terms. Rewrite the sentence by inserting the omitted keyword:- (5 marks)

a. Diffussion is the movement of ….. from their region of higher concentration to their region of lower concentration.

b. Pairing of …… chromosomes is synapsis.

c. Linkage is the tendency of …… to stay together in hereditary transmission.

d. ….. is the outermost protective meninge of the brain.

e. Stereotropic vision is the capacity to perceive depth or relative ……. Of the objects.

8. Rearrange the following :- (4 marks)

a. Dendrites, Nodes of Ranvier, Axon ending ,Synapse , Axon

b. Prophase, Anaphase, Telophase, Metaphase

c. Stimulus, CNS, Sensory neuron, Receptor, Motor neuron, Effectors, Response

d. ATP, splitting of water,photon intake, electron expulsion,RuBP

9. Write the factors that affect photosynthesis. ( 1 marks)



SECTION B

Question-1

A. Give the technical term for loss of water in the form of water droplets from the margin of leaves. (1)

B. Name the respiratory openings found on stems of woody plants. (1)

C. Describe an experiment to prove that transpiration occurs more from the lower surface of the leaf. (3)

D. Describe any three conditions which affect transpiration. (3)

E. Explain briefly transpiration is important for plants. (2)



Question -2 Make a neat diagram of the human eye in a vertical section and label the parts

which suit the following functions/description:- ( 6 marks)

a. The layer which prevents reflection of light.

b. The structure that alters the focal length of the lens.

c. The region of distinct vision.

d. The part that transmits the impulse to the brain.

e. The fluid present in the anterior part of the eye in front of the eye lens.

Question-3 a. State the role of chlorophyll. (2 marks)

b. Show by an experiment that chlorophyll is needed for photosynthesis. (2 marks)



Question-4 Give scientific reasons :- (10 marks)

a. Meiosis is the reduction division.

b. Humans are heterotrops.

c. Transpiration is low in humid condition.

d. When we go on a merry go round after coming down we still feel whirling sensation for some time.

e. DNA study is used for investigation in criminal cases.

Question-5 Explain X-linked inheritance. Name 2 genetic disorders. (2 marks)

Question-6 Draw a diagram for the structure of DNA. Answer the following question that follows:-

( 5 marks)

a. What is DNA composed of?

b. What is histone?

c. What is nucleotide?

d. What is the difference between nucleotide and nucleoside?

e. What is centomere?

Question-7 Write the answer to following:- (5 marks)

a. Define turgidity.

b. Write 2 benefits of turgidity to a plant.

c. What is opposite of turgidity?

d. Define heredity.

e. Differentiate between gene and allele.


VIII -BIOLOGY TEST

(The unit of Life-Cell) MM 20

1. Give the reason for the following:(3 marks)

a. Mitochondria is called powerhouse of cell

b. Golgi apparatus and Golgi complex is called semi-autonomous units.

c. Lysosomes are called suicide bags of the cell

2. Differentiate between the following:(2 marks)

a. Osmosis and diffusion

b. Chromosome and chromatin fibers

3. Give one term for the following:-(5 marks)

a. Organelle helping in storing oil and protein in plants

b. Organelle expelling water and waste materials from cell

c. Longest cell in our body

d. Process taking place well cell is kept in hypertonic solution

e. Organelle called brain of the cell

4. What are the different types of plastids? Give one function of each. (2 marks)

5. What is protoplasm? Why is it not possible to make an accurate chemical analysis of protoplasm? (2 marks)

6. Give the specific functions of following: ( 3 marks )

a. Ribosomes

b. Lysosomes

c. Vaculoes

7. Draw a well labeled diagram of plant cell. Explain the function of Golgi complex. ( 3 marks )