Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology what do animals eat? introduction to animal nutrition food for life types of nutrition

Which functional feeding groups are involved in the process of in-stream physical breakdown of coarse material into fine particulate organic matter?

  1. Collector filterers

  2. Shredders

  3. Grazers

  4. Collector gatherers
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Shredders are functional feeding groups in aquatic ecology that break down coarse particulate organic matter (CPOM) into fine particulate organic matter (FPOM).

Multiple choice biology what do animals eat? introduction to animal nutrition food for life types of nutrition

Birds take nectar by ________

  1. Chewing

  2. Swallowing

  3. Sucking

  4. Biting
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Birds take nectar by sucking it from the flowers. Birds that suck have slender, curved bills whose tongue are long and slender. When bird pokes its bills into the flower and extends its tongue, the straw-like tip will automatically take up some of the nectar through capillary action.
So, the correct answer is 'Sucking'.
Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

Which of the following is related to the morphological changes during aging?

  1. The number of taste bud decreases.

  2. Decreased rate of cardiovascular functions.

  3. The reduction in the nephron.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Ageing is a complex process that varies as to how it affects different people and even different organs. Most gerontologists (people who study aging) feel that aging is due to the interaction of many lifelong influences. These influences include heredity, environment, culture, diet, exercise and leisure, past illnesses, and many other factors.
  • Morphological changes during aging include the number of taste bud decreases, Decreased rate of cardiovascular functions and The reduction in the number of nephrons.
  • So, the correct answer is 'All the above'.
Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

............... is the pigment which is mainly released due to degradation of phospholipids in the cell membrane and actively participates in the ageing.

  1. Lipofuchsin

  2. Free radical

  3. Cellular proteins

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Ageing is a complex process that varies as to how it affects different people and even different organs. Most gerontologists (people who study aging) feel that aging is due to the interaction of many lifelong influences. These influences include heredity, environment, culture, diet, exercise and leisure, past illnesses, and many other factors.
  • Lipofuscin (age pigment) is a brown-yellow, electron-dense, autofluorescent material that accumulates progressively over time in lysosomes of postmitotic cells, such as neurons and cardiac myocytes. It participates in the ageing phenomenon.
  • Hence Lipofuchsin is the pigment which is mainly released due to degradation of phospholipids in the cell membrane and actively participates in the ageing.
  • So, the correct answer is 'Lipofuchsin'.
Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

Which of the following process can be related to ageing? 

  1. Mutation

  2. Chromosomal abbreviations

  3. Genetic recombinations

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

Ageing involves accumulation of cellular damage. Mutations in DNA accumulate over time and contribute to aging. Chromosomal aberrations (abbreviations) are structural changes that increase with age. Both processes are linked to ageing.

Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

According to immunity theory, ageing is due to

  1. Accumulation of errors

  2. Reduced functioning of endocrine glands

  3. Degeneration of thymus

  4. Accumulation of waste products
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to immunity theory, the immune system is programmed to decline its functions over time, and this fact is the main cause of aging. Thymic involution (shrinking of the thymus with age) is believed to be the main age-related change in the immune system, and this alteration begins after puberty.

So, the correct option is ‘Degeneration of thymus’.

Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

Lipofuscin causes ageing by

  1. Degradation of cellular protein

  2. Degradation of phospholipid of plasma membrane

  3. Degradation of endoplasmic reticulum

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Ageing is a complex process that varies as to how it affects different people and even different organs. Most gerontologists (people who study aging) feel that aging is due to the interaction of many lifelong influences. These influences include heredity, environment, culture, diet, exercise and leisure, past illnesses, and many other factors.
  • Lipofuscin (age pigment) is a brown-yellow, electron-dense, autofluorescent material that accumulates progressively over time in lysosomes of postmitotic cells, such as neurons and cardiac myocytes. It causes ageing by the degradation of phospholipid of the plasma membrane.
  • So, the correct answer is 'degradation of phospholipid of plasma membrane'.
Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

Which of the following hormone controls the biological clock of ageing?

  1. Thymosin

  2. Insulin

  3. Pancreas

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The thymus gland secretes a peptide hormone called Thymosin. Thymosin plays a major role in the differentiation of T-lymphocytes, which provide cell-mediated immunity. In addition, thymosins also promote the production of antibodies to provide humoral immunity.
  • The thymus gland is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
  • Hence Thymosin hormone controls the biological clock of ageing by promoting immunity in adult and by degeneration in older individuals.
  • So, the correct answer is 'Thymosin'.
Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

Which of the following induces the epithelial cells below the scab to undergo mitosis?

  1. Epidermal growth factor

  2. Fibroblast growth factor

  3. Glial growth factor

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Scab is a collection of dried blood cells and serum and sits on top of the skin surface.
  • The outermost layer of our skin is composed of epithelial cells. As wounds heal, epithelial cells regenerate across the wound surface from the edges to close the wound. 
  • The Epidermal growth factor induces the epithelial cells below the scab to undergo mitosis and facilitates closure of the wound.
  • So, the correct answer is 'Epidermal growth factor'.
Multiple choice different stages of growth reproductive system in humans division for growth and reproduction human system biology

Enzyme which becomes more active in aged person is _____________.

  1. Malate dehydrogenase

  2. Aldolase

  3. Lactate dehydrogenase

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

When ageing is progressing in the human body, different types of oxidising enzymes activity increases because of decreased rate of metabolism.

So, the correct option is ‘Malate dehydrogenase’.