UNIT 1
UNIT 2
UNIT 3
UNIT 4
SCIE 3001
Question 01 - Living Things
Question 02 - Living Things
Question 01 - Ecosystems
Question 02 - Ecosystems
Question 01 - Earth Sciences
 

Question 2 - Living Things

animal cell

Fig. 1.

1. (a) Figure 1 is a diagram of a typical Animal cell. Name the organelles labelled A to F and explain their functions in your answer booklet.

10 marks

(b) Describe the life stages of a NAMED animal which undergoes incomplete metamorphosis.

4 marks
(c) Give an example of another animal which undergoes incomplete metamorphosis.
1 mark
(d) What are the five main sub-groups into which vertebrates (animals with backbones) can be divided?
5 marks
(e) Give two unique characteristics of each of the sub-groups named in part (d).
5 marks
(a)(i)
Lablel
Name
Function

A

Cell membrane

This layer surrounds and protects the contents of the cell. It allows certain molecules to pass through it and enter the cell, while preventing others from so doing (selectively permeable).
B Cytoplasm The fluid which inside the cell. Organelles are suspended in the cytoplasm.

C

Nucleus The cell's 'command center'. It regulates the various metabolic processes within the cell and contains most of the cell's genetic material (DNA), is usually located near the center of animal cells, and closer to the edge in plants.

D

Golgi Body Where substances are processed and carried to the proper location within the cell, or out of the cell altogether.

E

Mitochondria the powerplant' of the cell. It converts food into energy. The number of mitochondria is an indicator of the activity level of the cell. So plant cells tend to have fewer mitochondria than animal cells. Mitochondria also contain a small amount of DNA, and therefore play a role in genetics.
F Vacuole These are sacs which serve as storage units. Vacuoles in animal cells are tiny, and are used to carry substances out of the cell, or to engulf undesirable substances such as bacteria or bits of dead tissue.
 
day and night

(b) Grasshopper

Z: Adult
X: Egg
Y: Nymph

 

(c) Tick
(ii)
5 vertebrate groups
Fish Amphibians Reptiles Birds Mammals

1. Have gills for obtaining oxygen from the water
2. Have fins for locomotion
3. Have scales for protection
4. Cold-blooded so activity is affected by environmental temperature
5. Have a swim bladder to float at different levels
6. Have a lateral line for detecting sounds
7. Lays eggs in water which usually develop outside the body
8. Eggs have moist covering

1. Have gills for obtaining oxygen from the water when juvenile
2. Have lungs for breathing in adults
3. Have moist skin for absorbing oxygen and water
4. Cold-blooded so activity is affected by environmental temperature
5. Lays eggs in water which usually develop outside the body
6. Eggs have moist covering
1. Have lungs for breathing
2. Have scales for protection
3. Have dry skin for prevent water loss
4. Cold-blooded so activity is affected by environmental temperature
5. Lays eggs on dry land which usually develop outside the body
6. Eggs have tough leathery covering

1. Have lungs for breathing
2. Have feathers for flight
3. Have scales for protectionon legs
4. Have hollow bones for flight
5. Do not store urine for flight (lightweight)
6. Do not have teeth (have beaks) for flight (lightweight)
7. Warm-blooded so activity is unaffected by environmental temperature
8. Lays eggs on dry land which usually develop outside the body
9. Eggs have hard calcarious covering

1. Have lungs for breathing
2. Have fur /hair for keeping warm
3. Have mammary glands to produce milk for young
4. Have structures for young to develop and feed inside the female body (live birth)
5. Warm-blooded so activity is unaffected by environmental temperature
 
Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.