Reproduction in Organisms Test

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Reproduction in Organisms Test - 61

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Weekly Quiz Competition

Question 1
1 / -0

Statement $$1$$: Viviparous animals give better protection to their offspring.
Statement $$2$$: In viviparous animals, young ones, after attaining a certain state of growth, are delivered out of the body of the female organism.

A
Both statements $$1$$ and $$2$$ are correct

B
Statement $$1$$ is correct but statement $$2$$ is incorrect

C
Statement $$1$$ is incorrect but statement $$2$$ is correct

D
Both statements $$1$$ and $$2$$ are incorrect

Solution

In oviparous animals such as reptiles and birds, fertilised eggs are covered by hard calcareous shell and are laid in a safe place. After incubation period, young ones hatch out. In viviparous animals such as majority of mammals including human beings, the zygote develops into a young one inside the body of the female individual. After a certain growth, young ones are delivered by the female individual. Due to proper care and protection, the chances of survival of young ones are more in viviparous individuals.
So, the correct answer is 'Both statements 1 and 2 are correct'.
Question 2
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A dandelion produces seeds without meiosis or fertilisation. The adult sporophyte forms diploid, rather than haploid, megaspores that develop into ovules containing diploid, rather than haploid nuclei. One of the nuclei in each ovule becomes an egg and develops directly, without fertilisation, into an embryo that is genetically identical to its parent. This type of reproduction is called ____________________.

A
Parthenogenesis, which is a form of apomixis

B
Parthenogenesis, which is a form of amphimixis

C
Adventive embryony, which is a form of apomixis

D
Agamosphermy, which is a form of amphimixis

Solution

Apomixis (Gk. apo-without, mixis-mixing) is a mode of reproduction which does not involve the formation of zygote through gametic fusion. Apomixis is thus asexual reproduction. Parthenogenesis (Gk. parthenos - virgin, genesis - produce) refers to the development of an egg/ovum into a complete individual without fertilisation.
Question 3
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Identify the incorrect statement.

A
In asexual reproduction, the offspring produced are morphologically and genetically identical to the parent

B
Zoospores are sexual reproductive structures

C
In asexual reproduction, a single parent produces offspring with or without the formation of gametes

D
Conidia are asexual structures in Penicillium

Solution

A zoospore is a motile asexual spore that uses a flagellum for locomotion. Also called a swarm spore, these spores are created by some protists, bacteria, and fungi to propagate themselves.
So, the correct option is 'Zoospores are sexual reproductive structures'.
Question 4
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Male and female, both gametes arise from the same parent in

A
Rabbit

B
Humans

C
Taenia

D
None of the above

Solution

A. Rabbit is a monosexual animal. Male gametes are produced by the male rabbit and female gametes are produced by a female rabbit.
B. In humans, females produce eggs and males produce sperms. These gametes fuse to produce a new organism.
C. Taenia, commonly known as Tapeworm, is a hermaphrodite organism. Each segment of a tapeworm, which is known as proglottid, consists of male and female reproductive systems.
Hence, both male and female gametes arise from the same parent in Taenia, as it is a hermaphrodite. So, the correct answer is 'Taenia'.
Question 5
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The phenomenon observed in some plants where in parts of the sexual apparatus is used for forming embryos without fertilisation is called:

A
Parthenocarpy

B
Apomixis

C
Vegetative propagation

D
Sexual reproduction

Solution

Apomixis is the term given to any phenomenon that leads to formation of embryo wherein parts of the sexual apparatus are used, but without fertilisation. Fertilisation is also absent in vegetative propagation, but parts of sexual apparatus are not involved. An example of apomixis is Citrus.
Question 6
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A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the given situation is

A
Plant is dioecious and bears only pistillate flowers

B
Plant is dioecious and bears both pistillate and staminate flowers

C
Plant is monoecious

D
Plant is dioecious and bears only staminate flowers
Solution
Correct option: D

Explanation:
On fertilization between gametes, Fruits are developed from ovaries, and seeds are developed from ovules.
If plant is dioecious (unisexual) and bears only pistil will accept pollens from other plants and can produce fruits and seeds.
If the plant is dioecious and both pistil and stamen can also produce fruits and seed through cross pollination.
If plant is monoecious, it can self pollinate and produce fruits and seeds.
But If plant is dioecious and bears only staminate flowers, can't produce fruits and seeds as pistils are absent in them.
Thus, if a dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the given situation is- it is dioecious and bears only staminate flowers. Option D is correct.
Question 7
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Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ___________.

A
Papaya

B
Bottle gourd

C
Maize

D
All of the above

Solution

The plants in which male and female flowers are brone on separate individuals, are referred to as dioecious plants. e.g. papaya, date palm. Dioecious plants, exhibit xenogamy.
Question 8
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Repair of endometrium is undertaken by _________.

A
LH

B
FSH

C
Estrogen

D
Prolactin

Solution

Estrogen secreted from ovarian follicles under the influence of FSH causes the proliferation of the endometrium of the uterine wall.
So, The correct answer is C.
Question 9
1 / -0

Those who give birth to young-ones are called viviparous. Some flabes lay eggs. Therefore,

A
Some frogs do lay eggs

B
Some frogs are fishes

C
Some fishes do not lay eggs

D
Some fishes are oviparous

Solution

Giving birth to live young is called vivipary. When a species lay eggs it is called oviparity.
So, the correct option is 'Some fishes do not lay eggs'.
Question 10
1 / -0

Haplodiploidy is found in

A
Grasshoppers and cockroaches

B
Birds and reptiles

C
Butterflies and moths

D
Honeybees, ants and wasps

Solution

Haploid-diploid mechanism or Haplodiploidy is a unique phenomenon in which an unfertilized egg develops into a male and a fertilized egg develops into a female. Therefore, the female is diploid (2n), and the male is haploid (n). Eggs are formed by meiosis and sperms by mitosis. Fertilization restores the diploid number of chromosomes in the zygote which gives rise to the female, If the egg is not fertilized, it will still develop but into a male (arrhenotoky or arrhenotokous parthenogenesis). It is seen in hymenopterous insects, such as bees, wasps, saw flies and ants. So, the correct answer is 'Honeybees, ants and wasps'.

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Reproduction in Organisms Test - 61

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Question 1

Both statements $$1$$ and $$2$$ are correct

Statement $$1$$ is correct but statement $$2$$ is incorrect

Statement $$1$$ is incorrect but statement $$2$$ is correct

Both statements $$1$$ and $$2$$ are incorrect

Solution

Question 2

Parthenogenesis, which is a form of apomixis

Parthenogenesis, which is a form of amphimixis

Adventive embryony, which is a form of apomixis

Agamosphermy, which is a form of amphimixis

Solution

Question 3

In asexual reproduction, the offspring produced are morphologically and genetically identical to the parent

Zoospores are sexual reproductive structures

In asexual reproduction, a single parent produces offspring with or without the formation of gametes

Conidia are asexual structures in Penicillium

Solution

Question 4

Rabbit

Humans

Taenia

None of the above

Solution

Question 5

Parthenocarpy

Apomixis

Vegetative propagation

Sexual reproduction

Solution

Question 6

Plant is dioecious and bears only pistillate flowers

Plant is dioecious and bears both pistillate and staminate flowers

Plant is monoecious

Plant is dioecious and bears only staminate flowers

Solution

Question 7

Papaya

Bottle gourd

Maize

All of the above

Solution

Question 8

LH

FSH

Estrogen

Prolactin

Solution

Question 9

Some frogs do lay eggs

Some frogs are fishes

Some fishes do not lay eggs

Some fishes are oviparous

Solution

Question 10

Grasshoppers and cockroaches

Birds and reptiles

Butterflies and moths

Honeybees, ants and wasps

Solution

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