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Biology Form 1 2 3 4 Notes

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BIOLOGY ESSAYS FOR EASY REVISION. 1(a

Describe the digestion of a starchy meal along the human alimentary canal. S (13 mks) Answer-Starch in food is first broken down in the mouth by action of teeth/ chewing; This increases the surface area exposed enzyme action; saliva contains salivary amylase which breaks down some starch to maltose; saliva has a slightly alkaline pH which is optimum for the enzyme; The food moves down to the oespophagus and stomach; where the acidic pH, due presence of dilute Hcl, prevents further action of salivary amylase; In the duodenum, pancreatic amylase continues digestion of starch to maltose; Pancreatic amylase is produced in the pancrease; and enters the duodenum through pancreatic ducts; the acidic chyme is neutralized by the sodium bicarbonate in bile/ pancreatic juice; Maltose digestion continues in the ileum; whose walls secrete succus entericus/ intestinal juice; which contains enzyme maltase; which breaks down maltose to glucose; (Max 13 marks) (b) Describe the process of urea formation. (7marks) answer Excess amino acids / proteins; are transported to the liver 2. (a) Describe how gaseous exchange occurs in terrestrial plants. (13 marks) Answer Gaseous exchange takes place in a spongy mesophyl During the day air diffuses into large air spaces of spongy mesophyll; through stomata; the Carbon (IV) Oxide in the air diffuses into Photosynthetic cells; in solution form; during photosynthesis Carbon (iv) Oxide is used while oxygen is produced. Oxygen diffuses out of the leaf; through stomata; During the night; air diffuses into the air spaces (of spongy mesophyll), the air dissolves into film of moisture; then oxygen diffuses into the cells; and is used in respiration during which carbon (iv) oxide is produced, the Carbon (iv) Oxide diffuses out of the leaf; through stomata; due to concentration/diffusion gradient; Gaseous exchange takes place through epidermis (of young leaves and stems); epidermis of the root carries out gaseous exchange with air in the soil; some plants have pneumatophores/breathing roots; in which gaseous exchange occurs through lenticels; (found in

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Absorption by Roots, Osmosis, and the Ascent of Sap • Roots and leaves are the main absorbing organs of the plant. ® Roots absorb water and minerals from the soil ® Leaves take in O 2 & CO 2 from the atmosphere • Reasons why plants need water: a) Turgidity-Cell sap in vacuoles lends rigidity to the plant b) Manufacture of food-Water is used as a raw material in photosynthesis along with CO 2 c) Translocation-Minerals absorbed by roots and carbohydrates prepared by leaves are transported in solution form d) Cooling of plant-When excess water is removed (by transpiration), the plant cools • Minerals and their Functions: a) Nitrogen-protein synthesis; growth b) Magnesium and iron-synthesis of chlorophyll c) Potassium-constituent of protoplasm; maintains osmotic balance in the cell; opening and closing of stomata d) Phosphorus-promotes nuclear and cell division e) Calcium-maintains the semi-permeability of the cell membrane f) Sulphur-constituent of amino acid (cysteine) g) Zinc-leaf formation • These minerals are taken in the form of ions/radicals; (Nitrogen absorbed as nitrates) • Functions of Roots: i. Fix the plant in soil ii. Absorb water and minerals from the soil iii. Conduct the absorbed substances through its tissues to the upper parts of plant • Adaptations of Roots: i. Branching nature-provides large surface area ii. Thin, freely permeable cell wall-allows movement of minerals in and out of cell by diffusion iii. Semi-permeable cell membrane-permits entry of water and restricts entry of salts by osmosis iv. Concentration of H 2 O in cell sap-in root hair is less than that of soil-helps in absorption of water by osmosis

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Biology Form 4 Paper 2 Questions and Answers End Term 1 Exam Free

Biology form 4 past paper 2 questions with marking scheme.

Answer all the questions in this section in the space provided

1.   The diagram below shows a section through the mammalian skin

            (a) Name the parts labelled W and X                                                                                (2mks)

                        W.

                        X 

            (b) State the function of the parts labelled Y and Z                                                        (2mks)

            (c) Explain the changes that occur in the skin when it is cold                                      (4mks)

2.   (a) Eye colour in fruits flies is sex-linked. Red eye colour R is dominant to white eye colour r

              A heterozygous red –eyed female fly was crossed with a white eyed male

            (i) Show the parental genotypes                                                                                        (1mk)

            (ii) By means of a genetic cross, determine the genotypic ratio of the offsprings     (4mks)

            (iii) Explain why the actual phenotype ratio obtained from this cross could differ from the

     Expected                                                                                                                           (1mk)

 (b) Name two disorders due to non-disjuction                                                              (2mks)

3.   The diagram below represents a feeding relationship in an ecosystem.

(a) Name the type of ecosystem represented by the above food web                                     (1mk)

            (b) Name the organism in the food web that

            (i) Is a producer                                                                                                                                (1mk)

            (ii) Occupies the highest tropic level.                                                                                           (1mk)

            (c) (i) Write a food chain that ends with the hawk as a quarternary consumer.                    (1mk)

(ii) State two short terms effects on the above ecosystem if all the small fish were killed                                                                                                                                                                    (2mks)

            (d) (i) How does oil spills lead to death of fish?                                                                         (1mk)

                (ii) Name one other cause of water pollution apart from oil spills.                                     (1mk)

4.   The experiment below was set – up to investigate some physiological processes. The glucose

solution was first boiled then cooled. The set up was left for 24 hours

 (a) Suggest two aims of the experiment.                                                                                  (2mks)

 (b) (i) State the expected observations after 24 hours                                                              (2mks)

     (ii) Explain your observations in a (i) above                                                                         (2mks)

     (iii) Why was glucose solution boiled then cooled?                                                              (1mk)

 (c) Suggest a control for the above experiment.                                                                         (1mk)

5.   A group of students set up an experiment to investigate a certain physiological process. The set up was as shown in the diagram below.

            After some time, the students observed that the level of sugar solution had risen

            (a) What physiological process was being investigated.                                                           (1mk)

            (b) Account for the rise in the level of sugar solution in this experiment.                             (4mks)

            (c) (i) State the results that the students would obtain if they repeated the experiment using

a piece of boiled pawpaw.                                                                                                  (1mk)

                (ii) Give a reason for your answer                                                                                            (2mks)

Biology F4 Questions SECTION B (40 MARKS)

Answer questions 6 (compulsory) and either questions 7 or 8 in the spaces provided questions

6.   During germination and growth of a cereal, the dry weight of endosperm, the embryo and the total dry weight were determined at two day intervals. The results are shown in the table below:

a)   Using the same axes, draw graphs of dry weight of endosperm, embryo and the total dry weight against time.                                                                                                                               (7mks)

b)   What was the total dry weight on day 5                                                                                (1mark)

c)   Account for

i.    Decrease in dry weight of endosperm from 0 to 10                                                              (2mks)

ii.   Increase in dry weight of embryo from day 0 to day 10                                                      (2mks)

iii. Decrease in total dry weight from day 0 to day 8                                                                  (1mk)

       iv. Increase in total dry weight after day 8                                                                           (1mk)

d)  State two factors within the seed and two outside the seed that cause dormancy

i.    Within the seed.                                                                                                                         (2mks)

ii.   Outside the seed                                                                                                                        (2marks)

e)   Give two characteristics of meristematic cells                                                                       (2mks)

7.         (a) Describe the process of fertilization in flowering plants                                         (15mks)

            (b) State the changes that take place in a flower after fertilization                              (5mks)

8.         (a)        Describe the mechanism of inhalation in man.                                                   (10mks)

            (b)       Using photosynthesis theory explain the mechanics of opening of stomata. (10mks)

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Biology notes form 1-4 pdf download free

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Biology free lesson plans for all topics (Form one to four)

Here are all the Biology secondary school lesson plans for all topics. You can also download the editable and pdf lesson plans below.

FREE BIOLOGY LESSON PLANS (FORM 1-4)

TEACHER’S NAME: …………………………………………        TSC NO: …………….    

SCHOOL/INSTITUTION: ……………………………………………

FORM: 3                                                    TERM: ………                          YEAR……………..

NUMBER OF STUDENTS…….             SUBJECT:  BIOLOGY

TOPIC: CLASSIFICATION II

SUB-TOPIC: REVIEW OF BINOMIAL NOMENCLATURE.

WEEK: ……..                                                                       LESSON NUMBER: ……..

DATE: ……..                                                                         TIME: ……….

OBJECTIVES : By the end of the lesson the learner should be able to;

-Classify common organisms into their main taxonomic units

-Write scientific names of organisms correctly

-List the kingdoms of organisms

LESSON PRESENTATION

SELF-EVALUATION:­­­­­­­­­­­­­­­­­­­_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Also read..

BIOLOGY FORM ONE SUMMARIZED NOTES

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SCHOOL/INSTITUTION: ……………………………………………………

SUB-TOPIC: KINGDOM MONERA.

DATE: ……..                                                                         TIME: ……….

-Describe the general characteristics of Kingdom monera

SCHOOL/INSTITUTION: …………………………………………………………

SUB-TOPIC: KINGDOM PROTOCTISTA.

-Describe the general characteristics of Kingdom protoctista.

-Observe, draw and name parts of spirogyra, amoeba, paramecium and euglena.

FORM: 3                                                    TERM: ………                          YEAR……………..

SUB-TOPIC: KINGDOM FUNGI.

DATE: ……..                                                                         TIME: ……….

-Describe the general characteristics of Kingdom fungi.

-List down all the members of kingdom fungi.

-Draw and name parts of bread mold (mucor), yeast and mushrooms.

FORM: 3                                                    TERM: ………                          YEAR……………..

SUB-TOPIC: KINGDOM PLANTAE-BRYOPHYTA.

WEEK: ……..                                                                       LESSON NUMBER: ……..

-Describe the main characteristics of kingdom plantae.

-Describe the main characteristics of bryophyte.

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1 thought on “Biology free lesson plans for all topics (Form one to four)”

Kindly provide for form 2 term 2 topics

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