Reproduction in Organisms Test

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Reproduction in Organisms Test - 56

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Question 1
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Which is gynandromorph type of animal?

A
Drossophilla

B
Beetles

C
Silk worms

D
All of the above

Solution

Gynandromorph is a type of animal that contains both male and female characteristics. It is also called as sex mosaic. In this, male and female body parts are physically distinct. Examples include Drosophila, butterflies, silk worms, butterflies, beetles, bees.
Thus, the correct answer is option D.
Question 2
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Choose the correct answers from the alternatives given.
The process of pollen transfer from anther to stigma of a flower is known as ________.

A
anthesis

B
pollination

C
fertilization

D
parthenogenesis

Solution

Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation. One of the ways that plants can produce offspring is by making seeds. Seeds are made at the base of the pistil, in the ovule. To be pollinated, pollen must be moved from a stamen to the stigma. When pollen from a plant's stamen is transferred to that same plant's stigma, it is called self-pollination.
So, the correct option is, 'pollination'.
Question 3
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Mint multiplies vegetatively by

A
Adventitious buds

B
Suckers

C
Tubers

D
Runners

Solution

Vegetative propagation in mint occurs through sucker. A sucker is a plant growing not from seed but from a meristem of the root at the base or at a certain distance from a tree or shrub. Vegetative reproduction is a type of asexual reproduction for plants. It is a process by which new plant “individuals” arise or are obtained without production of seeds or spores. It is a natural process in many plant species ( as well as non-plant organisms such as bacteria and fungi) but is also practised artificially by horticulturists to obtain large quantities of plants for economic purposes.
So the correct option is 'suckers'.
Question 4
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An example of a dioecious plant is

A
Cucumber

B
Maize

C
Castor bean

D
Date palm

Solution

A dioecious plant is one where the male and female reproductive systems occur on separate plants. While both plants produce flowers, one plant has the male reproductive parts and the other plant has the female parts. A dioecious plant requires two separate plants (a male and a female) to successfully pollinate, and only the female plant bears the fruit. Date palm is dioecious because these plants bear exclusively either male flowers or female flowers.
So the correct option is 'date palm'.
Question 5
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Which is the motile zoospore of Chlamydomonas in the given figure?

A

B

C

D

Solution

The zoospores in Chlamydomonas are the means of asexual reproduction which are formed during favourable conditions. The zoospores are formed in the following manner: The protoplast of the cell contracts to separate from the cell wall. The flagella are lost and contractile vacuole and neuromotor apparatus get disappeared. The protoplasm then divides longitudinally by mitotic divisions to form two daughter protoplasts which further divide mitotically at a right angle to the first division and four protoplasts are formed. Contractile vacuoles and neuromotor apparatus are formed in each daughter cell. Each daughter cell then develops a cell wall and two flagella at the anterior end and becomes zoospore. Since Chlamydomonas is a haploid alga, the zoospores formed are also haploid. Thus, the zoospore of Chlamydomonas is a haploid, biflagellated and asexual spore which matches with the figure C.
So, the correct answer is C.
Question 6
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In a bisexual flower when the gynoecium matures earlier than the anthers, the phenomenon is called ____.

A
Protogyny

B
Protandry

C
Herkogamy

D
Heterostyly

Solution

The situation in which the pistils mature first occurs in arum lilies and many wind-pollinated plants, such as grasses is called protogyny. The condition in which an organism begins life as a female and then changes into a male. (botany) The condition of flowers whose female parts mature before the male ones.
So. the correct option is, 'protogyny'.
Question 7
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Which one of the following is an egg-laying mammal?

A
Kangaroo

B
Opossum

C
Duck-bill platypus

D
Seal

Solution

There are only five living monotreme or egg-laying mammal species: the duck-billed platypus and four species of echidna (also known as spiny anteaters).
So the correct answer is "duck-billed platypus ".
Question 8
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An example of a monoecious plant is

A
Tomato

B
Rose

C
Cucumber

D
Shoe flower

Solution

Monoecious describes a single plant that bears both male and female flowers. With monoecious plant species, each plant has some flowers with stamens and some flowers with pistils. A monoecious plant can reproduce (that is, bloom and set seed) all on its own. Cucumbers, like most cucurbit plants, produce separate male and female flowers on the same plant. In botanical terms, these plants are said to be monoecious.
So the correct option is 'cucumber'.
Question 9
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Reproduction may be defined as a phenomenon by which organisms

A
Increase in size

B
Produce progeny of their own kind

C
Are produced from single fertilized eggs

D
Form new tissues and organs

Solution

Reproduction is the biological process by which new individual organisms – offspring – are produced from their parents. Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction. Reproduction in human beings is by sexual reproduction where both the male and female gametes fertilize to give rise to an embryo. The fertilization of human embryo occurs inside the body of the female
So, the correct answer is 'produce progeny of their own kind'
Question 10
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Osmoregulatory cells in flat worms are called.

A
Proto nephridia

B
Flame cells

C
Meta nephridia

D
Both a and c