Hair, Fiber, Pollen & Spores

True or False: All hairs on the body of a person are identical

False

True or False: Hair is composed of a protein called cellulose.

False

True or False: Spores contain the male gametes of seed plants

False

A characteristic of nature fibers is that they

a) Are stronger than synthetic fibers b) Will not break down when exposed to bright light c) Melt at a lower temperature than synthetic fibers d) Are affected by microscopic organisms

The period of active hair growth is called the _____ stage.

a) Catagen b) Telogen c) Anagen d) Imagen

What characteristics of cotton make it a great source of fiber for clothing?

a) It is very easy to grow. b) It is resistant to staining. c) The fibers are easily woven and dyed. d) The fibers are extremely long.

The hair shaft is composed of the cuticle, cortex, and

a) Medulla b) Root c) Crown d) Granules

Natural fibers can be harvested from

a) Plants and animals b) Only from plants c) Only from animals d) Plants, animals, and minerals

Which part(s) of a hair can be analyzed for DNA?

a) Root b) Cuticle c) Medulla d) Cortex

Mineral fibers such as asbestos are very durable. These fibers are used in all of the following except

a) Rope b) Insulation c) Fire Resistant Clothes d) Brake liners

Which factors are used to calculate the medullary index of the hair?

a) Scale diameter of the cuticle & the length of the hair b) Width of cortex and the width of the medulla c) Length of entire hair and the pattern of pigmentation d) Diameter of medulla and the diameter of the hair

Neutron activation analysis can check hair for the presence of

a) Silver b) DNA c) Water content d) Hair dye

All of the following are characteristics of a synthetic fiber except

a) They originate with petroleum products b) They are man-made. c) They are used in the production of cotton fibers. d) They do not contain any natural fibers.

When collecting pollen evidence, investigators should do all the following except:

a) Wear gloves b) Use the nearest container available c) Use clean tools d) Secure & establish a chain of custody

Pollen and spores can help determine all of the following except:

a) Whether a body was moved b) A crime's location c) A motive d) The season

Calculate the medullary index of a hair whose diameter is 110 microns wide and whose medulla measures 58 microns. Is this a human or animal hair?

58/110 = . 53 ( >. 33 so it is an animal)

True or False: Gymnosperms are the oldest seed plants.

True

True or False: Human hair grows at a rate of 1.3cm per month

True

True or False: The cortex is the location where nature creates natural hair coloring.

True

True or False: The shaft of the hair is considered class evidence in a trial.

True

If large quantities of fiber are found, what are two destructive analysis that can be performed?

burn analysis dissolve in various liquids

Describe two nondestructive analysis methods for fibers.

polarizing light microscopy infrared spectroscopy

Distinguish between self-pollination & cross-pollination.

self-> pollen transfers from an anther to the stigma within the same flower cross-> pollen transfers between 2 distinct plants

List 3 ways fiber evidence can be gathered.

special vacuums forceps (tweezers) tape

List 2 parts of the stamen and three parts of the pistil

stamen: anther & filament pistil: stigma, style & ovary