4. (SEDES) – Observe a imagem que resume o ciclo de vida animal e vegetal.
Ciclo de vida
Ciclo de vida
animal
vegetal
adulto
geração de
esporofito
multicelular
zigoto
zigoto
Diploide
(2n)
Diploide
(2n)
fertilização
meiose
fertilização
meiose
Haploide
Haploide
(n)
(n)
gametas
esporos
geração de
gametas
gametofito
multicelular
Sobre os ciclos de vida, é correto afirmar que
a) o processo de produção de gametas em ambos os ciclos é a meiose.
Nos animais e plantas, as únicas células haploides são os gametas
e o resto do ciclo de vida envolve apenas células diploides.
b) o processo de produção de gametas em ambos os ciclos envolve a
meiose. Nos animais, as únicas células haploides são os gametas,
nas plantas há uma geração multicelular haploide.
c) o processo de produção de gametas em ambos os ciclos envolve a
meiose. Tanto em animais como em plantas há uma geração
multicelular haploide e outra geração multicelular diploide.
d) nos animais os gametas são produzidos através da meiose e são
portanto haploides. Nos vegetais os esporos são as estruturas
haploides e os gametas são diploides.

the answer would be 3

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.