Tag: fertilization and post fertilization in humans

Questions Related to fertilization and post fertilization in humans

Gestation period of rabbit is

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. 18 - 20 days

  2. 28 - 32 days

  3. 48 - 50 days

  4. 60 - 70 days

Show answer
Correct Option: B
Explanation:

Gestation period is the time taken for embryo development after fertilization of egg in the female animal. 

In humans the gestation period is approximately 38 weeks. The gestation periods of chimpanzees (237 days), gorilla (257 days) and orangutan (260 days) indicate that the approximate nine-month gestation period predates the emergence of human beings as a species. 
The gestation periods of other animal reveals, that the length of the gestation period is largely a matter of the animal specie's size. Asian elephants have a gestation period of 645 days and African elephants 640 days. Dogs and other canines have a gestation period of about 60, which is also the period for cats. Even within the species of apes and monkeys gestation period seem to be a matter of size. For Rhesus monkeys it is 164 days and baboons 187 days. 
For small animals such as rabbits the period is about 33 days and for mice about 20 days. Thus, it appears that it takes a longer time for a big animal such an elephant to grow a baby than for a smaller animals, such as a mouse.

Monoestrous cycle animals may have

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. One ovulation each month

  2. One egg

  3. One breeding season in a year

  4. One menses each month

Show answer
Correct Option: C
Explanation:

Estrous cycle, or oestrous cycle, is the reproductive cycle found in most mammalian placental females, whereby there are recurring periods when the female is fertile and sexually receptive (estrus) interrupted by periods in which the female is not fertile and not sexually receptive (anestrus). 

Animals that have estrous cycles reabsorb the endometrium (inner membrane of the mammalian uterus) if conception does not occur during that cycle. The estrous cycle is contrasted with the menstrual cycle in which the endometrium is shed through menstruation when pregnancy does not occur and in which the female may be sexually receptive at any time during the cycle. 
There are many variations among animals in terms of their estrous cycles. Some may undergo estrous only one time a year during a particular season (monoestrous example white-tailed deer, foxes), while others may undergo a succession of cycles (polyestrous) during a certain time of the year if they do not become pregnant (horses, sheep), and others may undergo cycles throughout the whole year (mice, cows, pigs).

Gestation period is minimum in which of the following?

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Rabbit

  2. Man

  3. Elephant

  4. Mouse

Show answer
Correct Option: D
Explanation:

Gestation period is the time taken for embryo development after fertilization of egg in the female animal. In humans the gestation period is approximately 38 weeks. 

The gestation periods of chimpanzees (237 days), gorilla (257 days) and orangutan (260 days) indicate that the approximate nine-month gestation period predates the emergence of human beings as a species. The gestation periods of other animal reveals that the length of the gestation period is largely a matter of the animal specie's size. 
Asian elephants have a gestation period of 645 days and African elephants 640 days. Dogs and other canines have a gestation period of about 60, which is also the period for cats. Even within the species of apes and monkeys gestation period seem to be a matter of size. For Rhesus monkeys it is 164 days and baboons 187 days. 

For small animals, such as rabbits the period is about 33 days and for mice about 20 days. Thus, it appears that it takes a longer time for a big animal such an elephant to grow a baby than for a smaller animal such as a mouse.

Child birth is called as

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Pregnancy

  2. Parturition

  3. Menstruation

  4. Menopause

Show answer
Correct Option: B
Explanation:

Parturition is the process of expulsion of the child from the uterus or womb. It involves three stages- shortening and the opening of the cervix, descent and birth of the baby, and pushing out of the placenta. It is also known as childbirth. Thus the correct answer is option B.

Gestation period of rat is

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. 20 - 22 days

  2. 28 - 32 days

  3. 52 - 65 days

  4. 60 - 65 days

Show answer
Correct Option: A
Explanation:

The gestation period is the time in which the fetus develops, which starts with the fertilization and ends with the birth. The gestation period of brown rat is 21 days.
Thus, the correct answer is option (A), '20-22 days'.

Forceful muscular contraction of uterine wall is involved in.

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Implantation

  2. Lactation

  3. Micturition

  4. Parturition

Show answer
Correct Option: D

The gestation period of elephants is about 

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. 11 months

  2. 10 months

  3. 15 months

  4. 22 months

Show answer
Correct Option: D
Explanation:
For mammals, the gestation period is the time in which a foetus develops, beginning with fertilization and ending at birth. The duration of this period varies between species.
Gestation period of an elephant (Asian) is 616 days and elephant (African) is 645 days, approx 22 months.

Assertion : Predation is an interspecific interaction with a feeding strategy.

Reason :  Predation and their prey maintain fairly stable population through time and rarely one population become abundant or scarce.


zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

Show answer
Correct Option: A
Explanation:

Predation is an interspecific interaction with a feeding strategy i.e., one species (prey) is eaten up by another (predator). The number of predator usually depends upon the population of prey, but the later is also controlled by predators. Thus, predatory and the prey maintains fairly stable population through time and rarely one population becomes abundant or scarce.

Gestation period of $280$ days is calculated from time of
zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Last menstruation

  2. Fertilization

  3. Next menstruation

  4. Puberty

Show answer
Correct Option: A
Explanation:

The gestation period is calculated from the first day of the last menstrual period. This is used to calculate the expected date of delivery (EDD).

So the correct answer is A.

Gestation period in humans is

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. $7$ months

  2. $9$ months

  3. $25$ months

  4. $8$ months

Show answer
Correct Option: B
Explanation:

Gestation period is the time period of pregnancy. It is approximately 9 months in humans. So the correct answer is B.