AL Bio Past Newspaper 91 goal PART III A

 AL Bio Past Daily news 91 goal PART 3 A

A-LEVEL BIOLOGY PREVIOUS PAPER 1991-2003

TABLE OF CONTENTS

COMPONENT I

CELL BIOLOGY ………………………………………………………………… 3 FOOD COMPONENTS …………………………………………………………… 9 CHEMICAL ……………………………………………………………………….. … 10 MOTION OF WATER – IN AND OUT OF CELL ………………………. seventeen AUTOTROPHIC NOURISHMENT ………………………………………………. ….. 19 HETEROTROPHIC NUTRITION ………………………………………………. 25 RESPIRATION ………………………………………………………………... …. 28 GASEOUS EXCHANGE ……………………………………………………… 34 CLASSIFICATION ……………………………………………………………. …. 35

PART II

TRANSPORT IN ANIMALS ……………………………………………….... …. forty seven TRANSPORT IN PLANTS ……………………………………………………. 54 SUPPORT AND MOVEMENT ……………………………………………….. 49 PLANT HUMAN HORMONES ………………………………………………………….. sixty four COORDINATION …………………………………………………………... ……. 67 HORMONES …………………………………………………………………. ….. 72 HOMEOSTASIS ………………………………………………………………….. 78 ECOLOGY …………………………………………………………………. ….. 84 CONDITIONS ……………………………………………………………………………. 84 ENERGY FLOW ……………………………………………………………….. …… 84 ECOLOGY EXAMINE (FIELD) …………………….... ……………………………. …… 84 PYRAMIDS ………………………………………………………………………….. 84 SOIL ………………………………………………………………………………… 84 NITROGEN CYCLE …………………………………………………………………. 88

PART 3

HABITAT …………………………………………………………………. ………… 94 INTERDEPENDENCE OF ORGANISMS …………………………………………. … 106 POPULATION ……………………………………………….. ……………………. 113 SUCCESSION …………………………………………………………….. ………. 121 OTHERS ……………………………………………………………………... …… 116 CONSERVATION ………………………………………………………………. 119 MAN's IMPACT ON ENVIRONment ……………………………………... 121 microorganisms ……………………………………………………….. … 131 body protection ………………………………………………………………. one hundred thirty five

part iv

imitation ……………………………………………………... ………. 139 progress ……………………………………………………………………….. 147 genetics …………………………………………………….. ……………….. 159 evolution ……………………………. ………………………………. …… 173 dissertation …………………………………………………………………………… 174 diseases / medicine …………………... ………………………………….. …… 174 assorted ……………………………………. ……………………... …… 177 index ……………………………………………………………………………. 178

A-LEVEL BIOLOGY PREVIOUS PAPER 1991-2003

TABLE OF CONTENTS

(PART III)

ECOLOGY

Habitat94

Interdependence of Organisms106

Population113

Succession115

Others116

Conservation119

Man's Effect on Environment121

Microorganisms131

Body Defence135

Habitat

1 ) 1991 I actually (12)

Over a period of two years, the reproductive cycle (figure 1) as well as the population composition (figure 2) of a ocean invertebrate which has a planktonic larval phase were monitored over the west coast of the New Territories. In addition , various environmental conditions had been recorded. The results of such observations will be shown in figures you and 2 .

(a) With regards to figure you:

(i) Once does this invertebrate breed?

(Hint: The release of gametes from your gonads leads to a decline in their size. ) (1 mark)

(ii) Which environmental factors may act to synchronise reproductive activity through this invertebrate? (3 marks)

(iii) Give a one reason for deciding on all of these elements. (1 mark)

(iv) Recommend how One of those factors may possibly operate.

(2 marks)

(b) Suggest ONE environmental aspect not proven in figure 1 which might also control reproductive activity in this invertebrate. Briefly describe how this factor can affect reproductive activity. (2 marks)

(c) Explain the ecological value of having a planktonic larval stage. Brand ONE pet phylum creating a planktonic larval phase. (4 marks)

(d)Explain the gross annual fluctuation in salinity shown in physique 1 . (2 marks)

(e) Figure two shows the relative consistency of different measured animals of this species at the study area. The results are cumulative data collected over the 2-year period.

(i) If the total number of animals assessed over the two year period was 1798, just how many pets or animals belong to the most common size group? (1 mark)

(ii) Although there is a regular reproductive cycle, the people has not many juveniles. Suggest, with explanations, TWO conceivable reasons for this kind of phenomenon. (4 marks)

installment payments on your 1992 I actually (8)

Mussels are classy commercially for human...

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