Tag: zoology

Questions Related to zoology

Identify the wrong statement

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Plants produced vegetatively or asexually are called clones

  2. Organisms exhibiting external fertilization release a large number of gametes

  3. Development of embryo from fertilized female gamete is called parthenogenesis

  4. Conidia are formed in Alternaria

Show answer
Correct Option: C
Explanation:
Vegetatively propagated plants are the clone of their own parents because the fusion of gametes does not take place in vegetative propagation so there is no chance of recombination and variation.The parent cell divides to form daughter cell by mitosis due to which the offspring is genetically identical to the parent. The statement is true.
Organisms exhibiting external fertilization release a large number of gametes to increase the chance of fertilization and increase the rate of survival of the gametes which are affected by the unfavorable condition in the environment. The statement is true.
Parthenogenesis is the development of an embryo from an unfertilized egg or if a spermatozoa does penetrate the egg, there is no union of male and female pronuclei. It is a mode of asexual reproduction. The statement is false.
Alternaria solani is a deuteromycete with a polycyclic life cycle. Alternaria solani reproduces aesexually by means of conidia. The statement is true.
So, the correct answer is option C.

Development of an organism from female gamete/egg without involving fertilization is

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Adventitive embryony

  2. Polyembryony

  3. Parthenocarpy

  4. Parthenogenesis

Show answer
Correct Option: D
Explanation:
Parthenogenesis is the development of an embryo from an unfertilised egg or if a spermatozoa does penetrate the egg, there is no union of male and female pronuclei. It is a mode of asexual reproduction. On the basis of division, it is of two types apomictic parthenogenesis and automictic parthenogenesis. In apomictic parthenogenesis, the mature egg cells are produced by mitotic divisions, and these cells directly develop into embryos. The offsprings produced are full clones of the mother.
In automictic parthenogenesis, the mother cell undergoes meiosis and produces haploid offspring which are the half-clone of the mother cell.
Adventive embryony is a type of apomixis where the embryo arises from cells of nucellus or the integument.
The production of two or more embryos in one seed is known as polyembryony.
Parthenocarpy is natural or artificially induced production of fruit without fertilization of ovules.
So, the correct answer is option D.

Seedless fruits in Banana are produced through

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Asexual reproduction

  2. Parthenogenesis

  3. Triploid

  4. Cross pollination

Show answer
Correct Option: B
Explanation:

Seedless fruits in the banana are produced through parthenocarpy which is a type of parthenogenesis. The inflorescence contains clusters of flowers. The ovary of flower develops into a seedless fruit by parthenocarpy. The female flowers of the inflorescence present on the true stem mature and develop into fruit without fertilization of gametes while the male flowers produce pollen which may or may not be sterile.

So, the correct answer is option B.

The term parthenogenesis was coined by

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Grobber

  2. Balfour

  3. Boveri

  4. Owen

Show answer
Correct Option: D
Explanation:
The term parthenogenesis was coined by Richard Owen in 1849. He defined it as a method of creating individual by single ovum. It is the development of an embryo from an unfertilised egg or if a spermatozoa does penetrate the egg, there is no union of male and female pronuclei. It is a mode of asexual reproduction. On the basis of division, it is of two types apomictic parthenogenesis and automictic parthenogenesis.
So, the correct answer is option D.

 Parthenogenesis occurs in which of the following animal?

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Sheep

  2. Sponges

  3. Ant

  4. Hydra

Show answer
Correct Option: C
Explanation:

Parthenogenesis is a form of asexual reproduction where an egg develops into an offspring without being fertilized. Many insects like aphid, ant, bee, parasitic wasp reproduce parthenogenetically. 

Which is example of parthenocarpic fruit?

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Strawberry

  2. Cashew

  3. Banana

  4. Apple

Show answer
Correct Option: C
Explanation:

Parthenocarpic fruits are the fruits that develop without fertilisation. It is a phenomenon of formation of fruit from unfertilized flower. These fruits are seedless. Example , Banana.

So, the correct answer is C.

In honey bees, males (drones) are formed from

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Unfertilized eggs

  2. Fertilized eggs

  3. Embryo

  4. None of the above

Show answer
Correct Option: A
Explanation:
The male honey bees are called drones. Drones are formed from the unfertilized eggs i.e. haploid eggs of the queen bee. Fertilized eggs form queens and female workers. Drones are meant for mating with the queen bee and soon die after mating.
So, the correct answer is 'Unfertilised eggs'.

Offsets are produced by?

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Parthenocarpy

  2. Mitotic divisions

  3. Meiotic divisions

  4. Parthenogenesis

Show answer
Correct Option: A

In which of the following plants, it is undesirable to obtain seedless fruits?

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Tomato

  2. Orange

  3. Watermelon

  4. Pomegranate

Show answer
Correct Option: D
Explanation:

Parthenocarpy is the phenomenon behind most seedless fruits.  Parthenocarpy is fruiting without the union of a male and a female egg cell.  The lack of fertilization means that there are no seeds in the fruit.  If there are seeds, they are not viable and are not capable of germinating. Parthenocarpy is not found beneficial in only one type of fruits, that is pomegranate. It is because seeds are the edible parts in this fruit.

Process of formation of an individual without contribution of father is called as

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Epigenesis

  2. Pangenesis

  3. Induction

  4. Parthenogenesis

Show answer
Correct Option: D
Explanation:

The process of sexual reproduction usually involves gametogenesis, which generates haploid gametes (sperm and ovum) and their fusion during fertilization. Sometimes an embryo can develop without participation of male gamete (sperm). Parthenogenesis is a type of asexual reproduction in which females produce offspring from unfertilized eggs i.e., the development of an unfertilized egg into an adult organism. It is common among honeybees, wasps, and certain other arthropods.