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HOME ASSIGNMENT- DECEMBER 2015
BIOLOGY - FORM TWO
1.
a) What is meant by the following?
i) Waste
ii) Waste disposal
b) Describe the three basic principles of waste disposal
2. Explain the following
(a) Explain why desert animals have a long loop of Henle and fewer glomeruli
(b) Why one is not advisable to take bath immediately after heavy meal
(c) Why its better to breath though nose than mouth
(d) Why stomata open when guard cells are turgid
(e) Why the forearm can bent forward at the elbow but not backwards
(f) Why fraternal twins have fewer features in common than identical twins?
3. Discuss the role of the ileum in food digestion and absorption
4. The graph below shows some of the changes taking place during the menstrual Cycle.
a)
b)
c)
d)
e)
Name the hormones represented by the lines A and B on the grap
Name the structure C.
What is the purpose of the thickening of the uterus lining at D?
When is sexual intercourse most likely to result in pregnancy, at day 6,10,13,20, or 23?
Why is it important that the level of progesterone remains high in the blood of a woman
during pregnancy? How does her body achieve this
i) Just after she becomes pregnant?
ii) Later on in pregnancy?
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5.
Carefully study the figure below and answer the question that follows:-
(a) Name the structures labelled (a – E) in the figure above.
A
_________________________________________________________
B
_________________________________________________________
C
_________________________________________________________
D
_________________________________________________________
E
_________________________________________________________
(b) Which of the following structure named (A – E) in (a) above.
i)
Carries deoxygenated blood to the heart ________________________________
ii)
Carries blood rich in glucose and amino acid ___________________________
(c) (i) Name the process of breaking down amino acid in the liver ________________________________
ii) Name the substrate from which amino acid is produced ___________________
6. (a) Define the term respiration using all the following terms; Carbon dioxide, Oxygen, ATP, Cells, Mitochondria,
glucose and water
(b) Differentiate between:Photosynthesis
Respiration
i)
ii)
iii)
iv)
v)
vi)
7 ( a) How are the lungs adapted for the exchange of oxygen and carbon dioxide?
i) ____________________________________________________________________________
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ii)
iii)
iv)
v)
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
(b) Use the following food chain to construct food web.
i) Grass
mice
snake
ii) Grass
Grasshopper
Lizard
Snake
iii) Grass
warms
Toads
snakes Fungi
Bacteria
c) Name two importances of foochain and foodweb.
i) ____________________________________________________________________________
ii) ____________________________________________________________________________
d) Name organism(s) belongs to:i) First trophic level ___________________________________________
ii) Third trophic level __________________________________________
iii) Top trophic level ____________________________________________
8 (a) Define the following terms:i) Commensalisms
______________________________________________________________________________________
______________________________________________________________________________________
_____________________________________________________________
ii) Parasitism
______________________________________________________________________________________
______________________________________________________________________________________
______________________________________________________________
iii) Peristalsis
______________________________________________________________________________________
______________________________________________________________________________________
______________________________________________________________
(b) Give four (4) reasons (with examples) why do we study biology.
i) ___________________________________________________________________________
ii) ___________________________________________________________________________
iii) ___________________________________________________________________________
iv) ___________________________________________________________________________
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(a) Group O is a “universal donor” while group AB is a “universal recipient”. A person may receive blood of
his own group. Complete the following table, indicating by a tick (V) where no agglutination (clumping) will
occur and by a cross (X) where agglutination will occur.
B
Donor
A
Recipient
O
A
AB
B
O
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AB
b) Explain the terms:
i) Universal donor ____________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________
ii) Universal recipient _________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________
10.Write an essay on Malaria using the following guidelines.
i)
Causative agent
ii)
Transmission ways
iii) Symptoms
iv) Preventive measures (8 measures)
11Briefly explain what are the changes occurs in blood as it pass through different parts of the body.
12 (a) Carefully study the diagram below, then answer the questions that follows:-
i) Give the name of the above diagram.
ii) Name at least two (2) organisms in which the above system could be found.
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iii) Give the names of structures labelled as A, B, G, C and K.
(b) (i) Name the enzyme that is found in the food passing along structure E.
ii) Name three enzymes found in part C and food substrate they act.
(c) Name the two main functions of the part labelled I.
13.
Study the food relationship below, then answer the questions that follow:Bacteria
Bird
Larva
Snake
Grasshoper
Maize
Plant
Grasses
(a) (i) Name the food relationship shown above.
ii) Name one producer and one secondary consumer
(b) From the above food relationship, construct three simple food relationship in chain
form.
(c) Give one role of the following blood constituents.
i) Erthrocytes
ii) Leucocytes
iii) Thrombocytes
iv) Plasma
14.
Photosynthesis is very important process not only to plants but also to animals. Verify this statement by:a) Giving conditions necessary for the process.
b) Explaining three significant roles of the process to the living organisms.
15.
(a) Give four differences between Arteries and Veins.
(b) Give the role of each of the following as a first Aid components.
a.
Iodine tincture
b. Assorted bandage
c. A pair of scissors
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d. G.V
e. Safety pins
f. Petroleum jelly
16. (a) (i) What is Immunity?
ii) Give the two main types of body Immunity.
(b) Explain how the body defends itself from the pathogens or infections of diseases
through:a. Nose
b. Skin
c. Digestive system
d. Blood
17. (a) During the digestion process in the stomach, the gastric juice produced, composed
occur inactive form, which are:i) Pepsin as pepsinogen
ii) Renin as prorenin
of the enzymes that
Explain why these enzymes are produced as inactive enzymes and how do they become active.
(b) Without bile juice and pancrease, there is no digestion in the duodenum. Explain why?
18.
19.
Cholera is one of the diseases that when occurred it affect large number of people in a very short time in
different part of our country.
Write an essay on cholera under the following headings.
Causes of cholera
Symptoms of cholera
Transmission ways
Control measures
Respiration process is a vital metabolic activity to the living organisms. Justify this under the following
guidelines.
- Meaning of the process
- The place where it occur
- Raw materials and end product
- Main significance of the process.
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