Tag: parthenocarpic fruits

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

In honey bees, males (drones) are formed from

  1. Unfertilized eggs

  2. Fertilized eggs

  3. Embryo

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

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

  1. Tomato

  2. Orange

  3. Watermelon

  4. Pomegranate
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Epigenesis

  2. Pangenesis

  3. Induction

  4. Parthenogenesis
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Natural parthenogenesis occurs in

  1. Dog

  2. Honey-bee

  3. Frog

  4. House-fly
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parthenogenesis is a type of asexual reproduction in which an unfertilized egg develops into an adult animal. The adult is typically haploid. Parthenogenesis is common among insects (especially honeybees and wasps) and crustaceans; it also occurs among some other invertebrate and vertebrate groups, including some species of nematodes, gastropods, fishes, amphibians, and reptiles. Thus, the correct answer is option B.

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

Eggs of which one of these can develop parthenogenetically by chemicals?

  1. Man

  2. Frog

  3. Sea urchin

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Artificial parthenogenesis can be induced in eggs of both frog and sea urchin but chemical (hypertonic sea water) induction occurs in sea urchin, whereas, frog eggs when pricked with a needle can undergo parthenogenesis. Thus, the correct answer is option C.

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

Read the following statements $1$ and $2$ and identify the correct one.
$(1)$ In bees parthenogenetic zygote develops into monoploid male
$(2)$ The fertilised egg develops into diploid female.

  1. $1$ is correct, $2$ is not correct
  2. Only $2$ is correct
  3. Both $1$ and $2$ are incorrect
  4. Both $1$ and $2$ are correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In social bees like honeybees, unfertilized eggs develop via arrhenotokous parthenogenesis into haploid (monoploid) males, also known as drones. Fertilized eggs develop into diploid females, which can become workers or queens depending on their nutrition.

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

Parthenocarpy is the production of 

  1. Fruits with pollination

  2. Fruits without fertilization

  3. Seeds with fertilization

  4. Only seeds and no fruits
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In angiosperms, fruits represent ripened ovary of the flower. Fruit formation starts after fertilisation. However, sometimes fruit formation can be carried out without fertilization. Such, fruits are called as parthenocarpic fruits. They are seedless and lack embryo because no fertilization has occurred. Phytohormone auxins promote parthenocarpy. They have been used to induce parthenocarpy in tomatoes.

Thus, the correct answer is option B.