Reproduction in Organisms Test

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Reproduction in Organisms Test - 33

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Question 1
1 / -0

In mammals egg are microlecithal and isolecithal because these are

A
Oviparous

B
Viviparous

C
Ovoviviparous

D
None of the above

Solution

Mammalian eggs have very little yolk (microlecithal) because the embryo obtains maternal nutritional support throughout its development.
Isolecithal refers to the even distribution of yolk in the cytoplasm of the ovum in mammals and other vertebrates. In mammals, because the isolecithal cells have only a small amount of yolk, they require immediate implantation onto the uterine wall to receive nutrients.
So, the correct answer is option B.
Question 2
1 / -0

Development of an unfertilized egg is called

A
Parthenogenesis

B
Metamorphosis

C
Gametogenesis

D
Paedogenesis

Solution

The process of development of an embryo from an unfertilized egg is known as parthenogenesis. It is a natural form of asexual reproduction. They are considered as the clone of the parent.
Paedogenesis is the process of reproduction by larval animals. Fertilization do not take place and the development take place due to metamorphosis.
Metamorphosis is the process of development of organism after birth or hatching. It mainly takes place in the presence of thyroid hormone.
Gametogenesis is the process by which gametes are formed.
So, the correct answer is option A.
Question 3
1 / -0

If the menstrual cycle is of 35 days, then what is the risk period (cycle starts on $${ 1 }^{ st }$$ day )?

A
$${ 9 }^{ th }$$ to $${ 17 }^{ th }$$ days

B
$${ 11 }^{ th }$$ to $${ 18 }^{ th }$$ days

C
$${ 16 }^{ th }$$ to $${ 24 }^{ th }$$ days

D
$${ 18 }^{ th }$$ to $${ 35 }^{ th }$$ days

Solution

The risk period in the question refers to the time duration in which there are maximum changes of fertilisation and consequent pregnancy. In a normal menstrual cycle of 28 days, both LH and FSH attain a peak level in the middle of cycle (about 14th day). Rapid secretion of LH leading to its maximum level during the mid-cycle called LH surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation). The ovulation (ovulatory phase) is followed by the luteal phase during which the remaining parts of the Graafian follicle transform as the corpus luteum. If the menstrual cycle is of 35 days duration, the LH and FSH will attain peak level in the middle of cycle around 16th or 17th day and hence ovulation should occur on 16th or 17th day. After which ovum shall be available in oviduct for fertilization for 24 hours. If sperms don't arrive then after 24 hours the ovum shall start journey towards uterus. Chances of conception will be maximum if there is sexual intercourse around the middle of menstrual cycle. Thus 16th to 24th day is called a risk period. Before this period there will be follicular phase and after ovulation there will be luteal phase.
Question 4
1 / -0

Fertilization can be correctly defined as fusion of

A
Male and female pronuclei.

B
Cytoplasm of male and female gametes.

C
Two gametes.

D
Male and female gametes of the same species.

Solution

Sexual reproduction is a characteristic of animals, although many animals reproduce sexually as well asexually. Reproduction is essential to the survival of any species. Most animals are involved in some variety of sexual reproduction. The methods vary greatly from the simultaneous release of sperm and eggs into the water for many marine organisms, to fertilization inside the body for most terrestrial organisms and high degrees of parental care in birds and mammals.
Fertilization is defined as a process of fusion of male and female gametes. The gametes are special haploid cells. The most widely accepted definition of species is the biological species- according to which members of same species alone can carry on the process of sexual reproduction (including fertilization) and produce fertile offspring.
Question 5
1 / -0

Cleidoic egg is an adaptation for

A
Aquatic life

B
Marine life

C
Terrestrial life

D
Aerial life

Solution

Cleidoic eggs are laid by terrestrial animals like reptiles and birds. The egg is surrounded by a hard porous shell. Gaseous diffusion occurs through porous shell. Egg of aquatic animals is covered by a jelly coat and not by a hard shell. The shell in cleidoic eggs protects the developing embryo and also makes available an aquatic environment for development. The yolk of an egg is a source of nutrition for developing an embryo.
So, the correct answer is option C.
Question 6
1 / -0

Fertilization is

A
Union of diploid spermatozoon with diploid ovum to form diploid zygote.

B
Union of haploid sperm with haploid ovum to form haploid zygote.

C
Union of haploid sperm with haploid ovum to form diploid zygote.

D
Union of diploid sperm with haploid ovum to form triploid zygote.
Solution
Correct Option: C
Explanation:
Fertilization is the process in which we observe the fusion of male and female gamete.
The parent organism produces a haploid sex gamete called sperm in males and ova or ovum in females.
When these haploid gametes fuse, It brings out fertilization and forms a diploid zygote, which further undergoes division to become an organism.

Hence, fertilization is the union of haploid sperm with the haploid ovum to form a diploid zygote.
Question 7
1 / -0

The animals that consists of both male and female sex organs are known as

A
Viviparous

B
Oviparous

C
Sterile

D
Hermaphrodite

Solution

Hermaphrodite is the one which has both male and female reproductive organs in its body.
Viviparous are animals that give birth to live young ones.
Oviparous animals are those that lay eggs.
Sterile is one who is not able to produce young ones.
Thus, the correct answer is option D.
Question 8
1 / -0

In mammals, except primates, heat condition develops in

A
Late stage of pre-estrus phase

B
Estrous phase

C
Early stage of meta-estrus phase

D
Diestrus phase

Solution

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. During the estrous period also known as heat period, mature eggs are released from the ovaries.
Question 9
1 / -0

Menstruation is caused by

A
Increase in FSH level

B
Fall in oxytocin level

C
Fall in progesterone level

D
Increase in estrogen level

Solution

The level of progesterone hormone decreases after the regression of corpus luteum, causes the uterus to shed its lining and egg in a process termed as menstruation.
Question 10
1 / -0

The process in which new organisms are formed by an existing organism is called as ___________

A
Reproduction

B
Growth

C
Development

D
None of these
Solution
- Reproduction is the biological process in which new individual organisms 'offsprings' are produced from their parents (existing organisms).
Growth is the process of increasing in physical size.
- Development is the act or process of causing something to become larger or more advanced, for example, specialization of cells during regeneration in Hydra.
Therefore, the correct answer is option A.

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Reproduction in Organisms Test - 33

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Question 1

Oviparous

Viviparous

Ovoviviparous

None of the above

Solution

Question 2

Parthenogenesis

Metamorphosis

Gametogenesis

Paedogenesis

Solution

Question 3

$${ 9 }^{ th }$$ to $${ 17 }^{ th }$$ days

$${ 11 }^{ th }$$ to $${ 18 }^{ th }$$ days

$${ 16 }^{ th }$$ to $${ 24 }^{ th }$$ days

$${ 18 }^{ th }$$ to $${ 35 }^{ th }$$ days

Solution

Question 4

Male and female pronuclei.

Cytoplasm of male and female gametes.

Two gametes.

Male and female gametes of the same species.

Solution

Question 5

Aquatic life

Marine life

Terrestrial life

Aerial life

Solution

Question 6

Union of diploid spermatozoon with diploid ovum to form diploid zygote.

Union of haploid sperm with haploid ovum to form haploid zygote.

Union of haploid sperm with haploid ovum to form diploid zygote.

Union of diploid sperm with haploid ovum to form triploid zygote.

Solution

Question 7

Viviparous

Oviparous

Sterile

Hermaphrodite

Solution

Question 8

Late stage of pre-estrus phase

Estrous phase

Early stage of meta-estrus phase

Diestrus phase

Solution

Question 9

Increase in FSH level

Fall in oxytocin level

Fall in progesterone level

Increase in estrogen level

Solution

Question 10

Reproduction

Growth

Development

None of these

Solution

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