Tag: zoology

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Questions Related to zoology

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

Exchange of genetic material takes place in______________

  1. Vegetative reproduction

  2. Asexual reproduction

  3. Sexual reproduction

  4. Budding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Sexual reproduction is a mode of reproduction where new organisms are produced by the exchange of genetic material during fertilization. 
  • Vegetative propagation and budding are forms of asexual reproduction and there is no exchange of genetic material in asexual reproduction.

Therefore, the correct answer is option C.

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

Which one of the following is the difference between asexual and sexual types of reproduction?

  1. Asexual- gametes are produced, Sexual- gametes are not produced.

  2. Asexual- gametes are not produced, Sexual- gametes are produced.

  3. Asexual- no fertilization and zygote formation, Sexual- fertilization and zygote formation.

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In asexual reproduction, a single parent is involved to produce offsprings by fission, budding, or regeneration. While in sexual reproduction, gametes are produced by both the parents which fuses to form a zygote.
Thus, the correct answer is option D.

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

Choose the correct answer from the alternatives given.
In an experiment, oat (Avena sativa) seedlings were grown under the same conditions of temperature, moisture and light. Their tips were removed and divided into four groups. Each group was given different treatments and the growth was measured carefully after keeping them in dark for 16 Firs. Which of the following groups had the most growth?

  1. In Group I, the tip was put back on each seedling

  2. In Group II, a block of agar gel containing juice of 10 tips was placed on top of each seedling

  3. In Group III, nothing was placed on top of each seedling

  4. In Group IV, a drop of water was placed on top of each seedling
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the tip of the seedlings was covered with agar gel and is placed on seedling, The hormones which were later found to be auxins move from base to the apex. Thus the growth of the seedling was in the direction of more concentration of agar. As they were kept in dark, there was no light for growth so the seedlings have taken agar gel as the source of growth. While in those seedlings whose tips were again placed back on seedling or drop of water was placed on top of each seedling, growth does not occur as there is no medium for growth.

So, the correct option is 'In Group II, a block of agar gel containing juice of 10 tips was placed on top of each seedling'.

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

One advantage of sexual reproduction is that it allows for genetic sameness.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • In sexual reproduction, two individuals are involved and there is the genetic exchange between the male and female. 
  • As there is an exchange of genetic material, the offspring, won't have exactly the same material as either of his parents. 
  • There will be a different genetic content of each offspring, every time. As a result, there is no genetic sameness instead, sexual reproduction leads to variation.

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

Asexual reproduction produces offspring that are

  1. Genetically identical to their parents

  2. Genetically identical to their siblings

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Asexual reproduction is a mode of reproduction in which single parent produces offspring and inherit their genes. Asexual reproduction never involves in ploidy or reduction. The offsprings will be an exact copy of their parent and their siblings as well.
Thus, the correct answer is the option C.

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

The number of chromosomes in parents and offsprings of a particular species remains constant due to

  1. Doubling of chromosomes after zygote formation

  2. Halving of chromosomes during gamete formation

  3. Doubling of chromosomes after gamete formation

  4. Halving of chromosomes after gamete formation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During gamete formation, there is meiosis in which mother cell divides into 4 cells having a half number of chromosomes. In fertilization, male and female gametes fuse to form a zygote having the same number of chromosomes as parents. Hence, the number of chromosomes remains constant.

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

Offspring formed by asexual method of reproduction have greater similarity among themselves, because

  1. Asexual reproduction involves only one parent

  2. Asexual reproduction involves gametes

  3. Asexual reproduction occurs before sexual reproduction

  4. Asexual reproduction occurs after sexual reproduction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In asexual reproduction, the only single parent is involved and progeny develops directly from its parent by cell division, fragmentation, budding, etc. passing the same genes from generation to generations. Thus offspring formed by asexual reproduction have similarities among themselves. 

So, the correct answer is option A.

Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

......................... reproduction causes greater diversity.

  1. Sexual

  2. Asexual

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Sexual reproduction causes greater genetic diversity because the sperm and egg with a different set of genes fuse to form new individual and further mixes the genes to produce more genetic diversity. 
Asexual reproduction is the process where one organism divides into two without shuffling its genes, so the offspring has the same version of genes as the parent. Thus, the correct answer is option A.
Multiple choice zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

What is the effect of sexual reproduction?

  1. Offspring is weak.

  2. Offspring is like the parent.

  3. Offspring is more vigorous.

  4. Offspring is diseased.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Sexual reproduction is a form of reproduction which involves the fusion of male and female gametes to form a zygote in a process called fertilization. Their looks are not exactly like their parents. 
  • In sexual reproduction, there is increased variation in the population giving the species a better chance of survival in changing conditions. The offsprings are often more vigorous and flamboyant, meaning they go to great lengths to find a mate.

Thus, the correct answer is option C.