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CBSE Questions for Class 12 Medical Biology Reproduction In Organisms Quiz 4 - MCQExams.com
CBSE
Class 12 Medical Biology
Reproduction In Organisms
Quiz 4
The period between the two season is known as
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Estrus
0%
Proestrus
0%
Anestrus
0%
Metestrus
Explanation
The first phase (proestrus) of the estrous cycle is the building-up phase. During this phase the ovarian follicle (under the influence of FSH and LH) enlarges and begins to secrete estrogens.
Estrus is the period of sexual receptivity. It is primarily initiated by the elevation in estrogens from mature follicles just prior to ovulation.
The end of sexual receptivity marks the beginning of metestrus, the post-ovulatory phase dominated by corpus luteum function.
Anestrus is a state or interval of sexual inactivity between periods of activity in periodically breeding mammals.
So, the correct option is 'Anestrus'.
Which of the following is known as "period of heat"?
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Metestrus
0%
Proestrus
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Estrus
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None of the above
Explanation
The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is C.
Which of these reproduces by regeneration?
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Plasmodium
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Amoeba
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Euglena
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Planaria
Which of the following statement can be related to proestrus phase of an estrus cycle?
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Swelling of vulva and vagina
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The glands of uterus shows hypertrophy
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The Graafian follicle undergoes maturation
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All of the above
Explanation
The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Swelling in vulva and vagina can be noticed which indicates the preparation of sexual receptivity. The glands of uterus show hypertrophy due to the heat. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is D.
The estrus cycle can be divided into how many phases?
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Three
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Four
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Five
0%
One
Explanation
The reproductive cycle of the non-primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. In this phase, female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is B.
Estrous cycle is interrupted by :
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Anestrus
0%
Proestrous
0%
Metestrous
0%
None of the above
Explanation
Anestrus is a state or interval of sexual inactivity between periods of activity in periodically breeding mammals.
The first phase (proestrus) of the estrous cycle is the building-up phase. During this phase the ovarian follicle (under the influence of FSH and LH) enlarges and begins to secrete estrogens.
The end of sexual receptivity marks the beginning of metestrus, the post-ovulatory phase dominated by corpus luteum function.
So, the correct option is 'Anestrus'.
Ovulation occurs in which of the following stages of an estrous cycle?
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Proestrus
0%
Estrus
0%
Metestrus
0%
All of the above
Explanation
The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is B.
The first half of the estrus cycle is regulated by
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Progesterone
0%
Estrogens
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Aldosterone
0%
None of the above
Explanation
The reproductive cycle of the non primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive (can receive the male gamete). This phase is also regulated by the estrogen. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases.
So, the correct option is B.
The resting interval is short in
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0%
Estrus
0%
Polyestrous
0%
Monoestrus
0%
All of the above
Explanation
The estrous cycle consists of the physiologic changes that are induced by the reproductive hormones in mammals in females.
The polyestrous cycle is seen in some animals, where they have
many estrous cycles per year. Due to animals undergo
go into heat several times a year during the breeding
season
, the resting interval is very short.
A rabbit, cat, cow are examples of polyestrous.
Thus, the correct answer is option B.
Hysterical pregnancy is also known as
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0%
False pregnancy
0%
Pseudopregnancy
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Phantom pregnancy
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All of the above
Explanation
Hysterical pregnancy
is the appearance of signs and symptoms associated with
pregnancy
when the person is not actually
pregnant
.
It is also known as false pregnancy,
phantom pregnancy
, pseudopregnancy or
pseudocyesis,
False pregnancy
may sometimes be purely psychological.
So, the correct option is 'All of the above'.
The female cat stays in heat for
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0%
18-21 days
0%
16-21 days
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14-21 days
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None of the above
Explanation
Estrus is
the period in the sexual cycle of female mammals, except the higher primates, during which they are in
heat
—i.e., ready to accept a male and to mate.
The female cat stays in heat for 14-21 days i.e. it is ready to mate for this duration.
So, the correct option is '14-21 days'.
The second half of the estrus cycle is controlled by
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Progesterone
0%
Estrogen
0%
Testosterone
0%
Both A and B
Explanation
The reproductive cycle of the non-primate females is called oestrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus.
Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy.
Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive ( can receive the male gamete). This phase is also regulated by the estrogen.
Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level.
Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is A.
Monoestrous and diestrous can be differentiated by
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Breeding cycle
0%
Reproductive cycle
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Ornithine cycle
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None of the above
Explanation
On the basis number of estrous cycle (breeding cycle), females of some species can be monoestrous and diestrous. Monoestrous animals are those in which only one estrous cycle can be seen in a year. For example, dogs, fox etc. Whereas, diestrous animals are those in which two estrous cycles are seen in a year. For example, horse, goats etc. So, the correct option is A.
Which of the following is considered as resting phase according to the sexual point of view?
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0%
Metestrus
0%
Proestrus
0%
Anestrus
0%
All of the above
Explanation
The first phase (proestrus) of the estrous cycle is the building-up phase. During this phase the ovarian follicle (under the influence of FSH and LH) enlarges and begins to secrete estrogens.
The end of sexual receptivity marks the beginning of metestrus, the post-ovulatory phase dominated by corpus luteum function.
Anestrus is a state or interval of sexual inactivity between periods of activity in periodically breeding mammals.
So, the correct option is 'Anestrus'.
In which of the following phase of the estrus cycle, the female receives the male gamete?
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0%
Proestrus
0%
Estrus
0%
Metestrus
0%
All of the above
Explanation
The reproductive cycle of the non-primate females is called the estrous cycle. For example, in rats, horses etc.
It can be divided into four phases - proestrus, estrus, metestrus, and diestrus.
Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy.
Estrus is the phase when ovulation takes place. It is also known as the period of heat and female is sexually receptive (can receive the male gamete).
Metestrus is the phase where the corpus luteum forms under the influence of decreased estrogen and increased progesterone levels.
Diestrus is the phase where the corpus luteum becomes functional and the progesterone level further increases.
So, the correct option is B.
The estrus frequency of cow is
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0%
18 days
0%
15 days
0%
21 days
0%
!7 days
Explanation
Estrus cycle is the period of sexual activity in female mammals except for higher mammals, during which they are in heat i.e. ready to mate.
Cows can go into heat several times per year.
Estrus frequency of cow is 21 days i.e. it goes into heat with a duration of 21 days.
So, the correct option is '21 days'.
A female dog is
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0%
Monoestrus
0%
Diestrous
0%
Both A and B
0%
None of the above
Explanation
Estrous cycle comprises of the recurring physiologic changes that are induced by reproductive hormones in females of mammals.
Monoestrous means having one estrous cycle per year.
Diestrous means having two estrous cycles per year.
Polyestrous means having many estrous cycles per year. A female dog is an example of diestrous.
Thus, the correct answer is option B.
Estrus frequency of a goat is
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0%
18 days
0%
13 days
0%
17 days
0%
21 days
Explanation
Estrous cycle is the reproductive cycle seen in non-primates female. It is the time from one heat period (estrous) to another heat period (estrous). This time period can vary from one species to another species. In goat the estrus frequency is of 21 days. So, the correct option is D.
Which of the following hormone regulates anestrus?
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Calcitonin
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Melatonin
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Estrogen
0%
Progesterone
Explanation
The reproductive cycle of the non primate females is called estrous cycle. The phase when the female is sexually receptive is called as estrus and the phase when the female is not sexually receptive is called as anestrus. When the pineal gland is exposed to light, there is release of the hormone melatonin. The hormone causes stimulation and repression of reproduction in different kind of breeders. This hormone regulated the activity and the release of GnRH (gonadotropin releasing hormone).
Thus, the correct answer is option B.
The process of fusion of male gamete and female gamete is called.
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Pollination
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Fertilization
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Cell maturation
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Cell elongation
Explanation
The male and the female gamete are the reproductive cells which are formed by the germ cells. These gametes are fuse and the process is known as fertilization. This is an important step in the sexual reproduction which results in the formation of the zygote which develops to form a new individual.
Thus, the correct answer is option B.
In which of the following organisms fragmentation occurs?
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Bacteria
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Yeast
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Spirogyra
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All of the above
Explanation
Fragmentation is a process of asexual reproduction in which the parent organism breaks up into two or more pieces/fragments, and each piece/fragment gives rise to a new individual.
Spirogyra
undergoes fragmentation.
Bacteria undergo fission, and
Yeast undergoes budding.
So, the correct option is
C.
Which of the following perform reproduction in plants?
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Roots
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Stem
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Flower
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All of the above
Explanation
Flowers perform the function of reproduction in plants and are the reproductive parts of a plant. For example, rose, papaya.
On the other hand, roots, stems, leaves, and buds are the vegetative parts of the plant but are also involved in reproduction known as vegetative propagation. For example-
Bryophyllum
, potato.
Plants like potatoes (
Solanum tuberosum
) reproduce by producing tubers. Tubers are modified stems that store starch. Tubers arise as swollen ends of stolons and contain many adventitious buds (eyes on potatoes). Each eye can grow to form an individual plant.
So the correct option is "All of the above".
Which of the following plants reproduces by roots?
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Sweet potato
0%
Turmeric
0%
Ginger
0%
None of the above
Explanation
Option 'A' is correct
Reproducetion by root is a type
of vegetation reproduction. In
this process, both the adventitious
and tap roots taks part due to
the presence of bud which is
known as radical bud. The
adventitious buds dutaches from
root is guienc rise to a neue plant
Example - sweet potato.
The production of a new individual from the parent is called
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Reproduction
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Propagation
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Cloning
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None of the above
Explanation
Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes. The offspring that arise by asexual reproduction, either from a single cell or from a multicellular organism, inherit the genes of their single parent.
When two parents are involved in reproduction, the method is called sexual reproduction. The male and female gametes fuse during fertilization to produce the zygote. The zygote subsequently develops into an embryo which further develops into a new individual.
In either case, the new individual arises from the parent.
So the correct option is "Reproduction".
The process in which organisms break into pieces is called
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Budding
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Fragmentation
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Spore formation
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All of the above
Explanation
Fragmentation is the process in which the body of an organism breaks up into two or more pieces, which on maturing grows to form a completely new organism.
Ex- Spirogyra, algae.
So the correct option is "B- Fragmentation".
In which of the following modes of reproduction new plants are produced without seeds?
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Asexual reproduction
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Sexual reproduction
0%
Vegetative propagation
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Both A and C
Explanation
Asexual reproduction produces plants that are genetically identical to the parent plant because no mixing of male and female gametes takes place
Vegetative reproduction is a type of asexual reproduction without the production of seeds or spores. Many types of roots exhibit vegetative reproduction.
While in sexual reproduction produces offspring by the fusion of gametes, resulting in offspring genetically different from the parent or parents. The zygote formed due to the fusion of gametes will develop to form an embryo that is protected in hard protective coverings of seed.
Hence, option D is correct.
When gamete fusion is involved in the formation of new organism the phenomenon is known as
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Syngamy
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External fertilization
0%
Parthenogenesis
0%
Parthenocarpy
Explanation
Syngamy is a process in sexual reproduction that is defined as the fusion of the male gamete i.e., sperm with the female gamete i.e., egg resulting in the formation of a diploid zygote. Thus the correct answer is option A.
In which of the following processes water is involved in the reproduction?
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Budding
0%
Spore formation
0%
Fragmentation
0%
All of the above
Explanation
When water and nutrients are available algae grow and multiply rapidly by fragmentation.
An alga breaks up into two or more fragments. These fragments or pieces grow into new individuals.
This process continues and they cover a large area in a short period of time.
Option "C" is correct.
In chlorophyceae, sexual reproduction occurs by:-
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Isogamy and anisogamy
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Isogamy, anisogamy and oogamy
0%
Oogamy only
0%
Anisogamy and oogamy
Explanation
Chlorophyceae is a class of algae that is also known as green algae commonly. Different members of this class reproduce differently.
They reproduce by fusion of similar gametes ( isogamy ), the fusion of dissimilar gametes ( anisogamy ) as well as the fusion between a small non-motile and a large non-motile gamete (Oogamy).
So, the correct answer is 'Isogamy, anisogamy, and oogamy'.
The common mode of sexual reproduction in
Chlamydomonas
is
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0%
Isogamous
0%
Anisogamous
0%
Oogamous
0%
Hologamous
Explanation
Chlamydomonas reproduces both asexually and sexually.
Asexual reproduction takes place by zoospores while sexual reproduction can be isogamous, anisogamous or oogamous.
Though, commonly fusion takes place between similar gametes hence reproduction takes place by isogamy.
So, the correct option is 'Isogamous'.
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