Tag: diversity and classification in animals

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Multiple choice botany caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells diversity and classification in animals cell parameters

A cell weighing 1 mg grows to double its initial mass before dividing into two daughter cells of equal mass. Assuming no death, at the end of 100 divisions what will be the ratio of the mass of the entire populations of these cells to that of the mass of the Earth? Assume that mass of the Earth is $10^{24}Kg$ and $2^{10}$ is approximately equal to $1000$.

  1. $10^{-28}$
  2. $10^{-3}$
  3. $1$
  4. $10^3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A cell starts at 1 mg (10^-6 kg) and divides 100 times. The total number of cells after 100 divisions is 2^100. The mass of the population is 10^-6 kg * 2^100. Given that 2^10 is approximately 10^3, 2^100 = (2^10)^10 is approximately (10^3)^10 = 10^30. Thus, total mass = 10^-6 kg * 10^30 = 10^24 kg, which matches the given mass of the Earth (10^24 kg). The ratio is therefore 1.

Multiple choice botany caskets of life the cell structure cytoplasm unicellular and multicellular organisms number and shape of cells diversity and classification in animals cell parameters

Hybridoma cells are

  1. nervous cells of frog

  2. hybrid cells resulting from myeloma cells

  3. only cells having oncogenes

  4. product of spore formation in bacteria.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybridoma cells are created by fusing a B-lymphocyte (antibody-producing cell) with a myeloma cell (cancerous cell). This fusion allows the resulting cells to produce specific antibodies indefinitely.

Multiple choice botany living world of animals oviparous and viviparous number and shape of cells unicellular and multicellular organisms diversity and classification in animals

The organism made up of only a single cell is known as 

  1. Unicellular

  2. Acellular

  3. Multicellular

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

The cell is the structural unit of life. Unicellular organisms are made up of one cell that performs all the functions and thus, called as a single-celled organism.

Multiple choice biology animal world oviparous and viviparous number and shape of cells unicellular and multicellular organisms diversity and classification in animals adaptations in animals

Which one is not an oviparous animal?

  1. Human

  2. Crow

  3. Hen

  4. Crocodile
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Animals that lay eggs to produce their offspring are known as oviparous animals
  • Birds, reptiles and amphibians are examples of oviparous animals.
  • Mammals (including human beings) are an example of viviparous animals as they produce offspring by the development of embryo inside their body, eventually leading to live birth.
So, the correct option is 'Human'.

Multiple choice biology animal world oviparous and viviparous number and shape of cells unicellular and multicellular organisms diversity and classification in animals adaptations in animals

Animals who give birth to young ones are 

  1. Oviparous

  2. Viviparous

  3. Ovoviviparous

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

Animals giving birth to young ones are called viviparous animals. The egg of these animals typically contains less of yolk insufficient to support the development of the zygote into an embryo. Hence, development proceeds inside the body of the female animal and the fully developed embryo is delivered. Oviparous animals lay an egg. Their egg typically has more amount of yolk and can support the development of the zygote into an embryo. Ovovivipary is an in-between scenario in which eggs are retained till embryo is developed and is then delivered.

So, the correct answer is option B.

Multiple choice biology animal world oviparous and viviparous number and shape of cells unicellular and multicellular organisms diversity and classification in animals adaptations in animals

Birds are considered oviparous

  1. They are able to fly

  2. The forelimbs are modified into wings

  3. They lay eggs

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

Ovipary is the phenomenon in which an adult organisms reproduces and lays eggs which later hatch and give rise to young ones.

Since birds lay eggs they are known as oviparous.
Flight or wing modifications are not related to this phenomenon.
So the correct answer is 'They lay eggs'.

Multiple choice biology animal world oviparous and viviparous number and shape of cells unicellular and multicellular organisms diversity and classification in animals adaptations in animals

Birds and snakes are oviparous animals.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Oviparous are the animals which lay eggs. Snakes belong to class Reptilia and birds belongs to class Aves. They lay eggs. The eggs hatch by the warmth of the body. The yolk of the egg provides nutrition to the developing embryo.
So, the correct answer is option A.