science strategies for survival Flashcards
What is the advantage of sexual reproduction
more diversity
What are two disadvantages of external fertilization?
Two disadvantages of external fertilization is that there may be a smaller number of offspring and it is hard for the two animals to actually come in contact in water which increases the chances of the animal being eaten.
How do animals overcome the disadvantages of external fertilization?
Animals overcome the disadvantages of external fertilization by releasing thousands of sperm and eggs at a time.
Explain internal fertilization. What are the advantages?
Internal fertilization happens inside the female’s body and an advantage is that there is an increased chance of egg and sperm uniting.
Animals use their physical appearance or behaviors to increase their chance of finding a mate. Describe one example.
An example of animals using their physical appearance or behaviors to increase their chance of finding a mate is a peacock spreading its feathers to show off its beauty.
In order to sexually reproduce without the use of water, plants have pollen grains that carry sperm. What is the disadvantage of producing pollen in cones rather than flowers?
A disadvantage of producing pollen in cones rather than flowers is that seeds are not protected.
The male part of a flower is called the
stamen
What two organs make up the male parts
anther and filament
The female part of a flower is called the
pistil
What three organs make up the female parts?
Stigmi, style, ovary
Which part of the stamen produces and stores pollen (sperm)?
anther
Which part of the pistil contains the ovules (eggs)
ovary
What adaptations help plants increase the chance of successful reproduction?
petal colors, scent
the turning of all or part of an organism in a particular direction in response to an external stimulus.
tropism
a connection between two or more species
symbiosis
