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Biology Paper 1


State the uses of the following apparatus during ecological studies.CLASSIFICATION I

a) Fish net (1mk)

b) A pair of forceps (1mk)

2 marks


Name the other body part of crustacea other than the abdomen. CLASSIFICATION II (1mk)

1 marks


a) Define the following terms GENETICS

i) allele (1mk)

ii) Biotechnology

b) State the importance of crossing over (1mk)

3 marks


a) Give two properties of the cell membrane. CELL PHYSIOLOGY (2mks)

b) How does diffusion gradient influence rate of diffusion? (1mk)

3 marks


The table below shows the approximate concentration of various components of blood plasma, glomerular filtrate and urine of a healthy human being. EXCRETION AND HOMEOSTASIS

a) Name the process responsible for absence of glucose in urine. (1mk)

b) Account for the absence of plasma protein in both glomerular filtrate and urine (2mks)

3 marks


State two mechanisms that hinder self- pollination REPRODUCTION IN PLANTS AND ANIMALS (2mks)

2 marks


Study the diagram below and answer the questions that follow GASEOUS EXCHANGE

a) What was the aim of the experiment? (1mk)

b) i) State the expected results after three hours. (1mk)

ii) Account for your answer in b (i) above. (1mk)

3 marks


The diagram below represents certain types of muscles. Study them and answer the questions that follow THE CELL

i) Identify the type of muscles represented by A and B.

ii) Name one part of the body from which muscle A has been obtained. (1mk)

3 marks


The number of stomata on the lower leaf and upper leaf surface of two leaves from plant x and y were counted under the field of view of a microscope.

The results were asshown in the table below. NUTRITION IN PLANTS AND ANIMALS

a) Which of the two leaves would be expected to have a lower rate of transpiration(1mk).

b) Give two reasons for your answer in (a) above (2mks)

3 marks


An experiment was set up as shown below to investigate the effect of unilateral light on the growth of the coleoptile. RECEPTION,RESPONSE AND CO-ORDINATION IN PLANTS AND ANIMALS

Explain the observation made at the end of the experiment (3mks)

3 marks


. a) State the role of FollicleStimulating Hormone in the menstrual cycle of a human female. REPRODUCTION IN PLANTS AND ANIMALS (2mks) b) Name the source of progesterone hormone after four months of pregnancy (1mk)

3 marks


. Give three adaptations of the Red blood cells to their functions TRANSPORT IN PLANTS AND ANIMALS (3mks)

3 marks


Study the diagram below and answer the questions that follow TRANSPORT IN PLANTS AND ANIMALS

a) Name the part labeled P. (1mk)

b) Name the types of tissues found in the part marked Q (1mk)

c) Give the significance of the above named tissues in (b) above (1mk)

3 marks


Give two limitations of fossils records as evidence of organic evolution. EVOLUTION (2mks)

3 marks


Study the diagram below and answer the questions that follow REPRODUCTION IN PLANTS AND ANIMALS
a) Identify the cell illustrated above (1mk)

b) Name the parts A and B

3 marks


There is a government campaign of vaccinating females from age 14 years to menopause against tetanus. GASEOUS EXCHANGE

Explain how a vaccine works?

3 marks


State three things that happen to glucose produced during photosynthesis NUTRITION IN PLANTS AND ANIMALS (3mks)

3 marks


a) Define the term species (1mk)

b) Name the division of plants in which seeds are enclosed in an ovary wall which develops into a fruit CLASSIFICATION I (1mk)

2 marks


State three adaptations of hydrophytes that enable them to deal with problems of Transpiration ECOLOGY (3mks)

3 marks


Spreading oil on the surface of stagnant water was an old method of controlling mosquitoes. ECOLOGY

a) How did the method work? (1mk)

b) Why is the method discouraged? (2mks)

3 marks


A form two student set up an experiment using soaked and dry seeds as shown GROWTH AND DEVELOPMENT

a) What was the aim of the experiment? (1mk)

b) Account for the observations that were made. (2mks)

3 marks


Form two students in the laboratory placed some chopped potato in a colourless liquid and observed that there was a reaction that produced bubbles. CELL PHYSIOLOGY

a) What is the identity of the colourless liquid? (1mk)

b) Account for the observation (2mks)

3 marks


Plants and animal cells are different. INTRODUCTION TO BIOLOGY a) Name a structure in plant cells not found in animal cells (1mk)

b) Name a structure in animal cells not present in plant cells: (1mk)

3 marks


a) What is a respiratory surface? RESPIRATION (1mk)

b) Account for the many number of respiratory surfaces in the class amphibia.(2mk

3 marks


State two roles of the DNA molecule GENETICS

2 marks


Name two strengthening tissues in plants SUPPORT AND MOVEMENT IN PLANTS AND ANIMALS (2mks)

2 marks


After a short race, an athlete was seen to be panting and is said to be experiencing “oxygen debt” GASEOUS EXCHANGE

i) What is “oxygen debt” (1mk)

ii) Why don’t plants experience “oxygen debt”? (1mk)

2 marks


a) Give two characteristics of the Kingdom protoctista. CLASSIFICATION II (2mks)

b) Name the organelle used by a paramecium to regulate water balance.

2 marks


. Study the diagram below and answer the questions that follow RECEPTION,RESPONSE AND CO-ORDINATION

a) Name the parts K and L (2mks)

b) State one function of M (1mk)

3 marks


Describe how blood is pumped out of the mammalian heart (systole). TRANSPORT IN PLANTS AND ANIMALS (3mks)

3 marks


a) Name two parts in which excretory products are stored in plants. EXCRETION AND HOMEOSTASIS (2mks)

b) Give a reason why these excretory products don’t harm the parts named in 3(a) above. (1mk)

3 marks

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