Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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

Protein which plays a significant role in ageing is

  1. Actin

  2. Myosin

  3. Collagen

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

A. Actin - plays an important role in embryogenesis, the healing of wounds and the invasivity of cancer cells.

B. Myosin – plays an important role in muscle contractions and  a variety of movements of nonmuscle cells, including cell division,

C. Collagen – plays a significant role in ageing.

D. Elastin - plays an important role in the biomechanical function of vital body tissues and organs such as the heart, lungs, skin and the vocal folds.

So, the correct option is ‘Collagen’.

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

According to which theory is the given statement correct?

Statement. B and T cells having receptors for self-antigens undergo programmed cell death

  1. Somatic mutation theory

  2. Programmed senescence theory

  3. Wear and tear theory

  4. Immunological theory
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A. Somatic mutation theory - posits that the accumulation of mutations in the genetic material of somatic cells as a function of time results in a decrease in cellular function.

B. Programmed senescence theory - refers to the idea that senescence in humans and other organisms is purposely caused by evolved biological mechanisms in order to obtain an evolutionary advantage.

C. wear and tear theory - asserts that the effects of ageing are caused by progressive damage to cells and body systems over time. Essentially, our bodies "wear out" due to use. Once they wear out, they can no longer function correctly.

D. Immunological theory - asserts that the process of human ageing is, in fact, a mild and generalized form of the prolonged auto-immune phenomenon.

So, the correct option is ‘Programmed senescence theory’.

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

Ageing starts with disappearance of

  1. Spleen

  2. Pituitary gland

  3. Thymus gland

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

Ageing starts with the disappearance of thymus according to immunity theory . 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 ‘thymus gland’.

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

Which is not connected with theory of ageing

  1. Wear and Tear

  2. Neurohormonal changes

  3. Epimorphosis

  4. Metabolic rate

  5. Somatic mutation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Increase in the age of the persons is called ageing. In this, loss or decrease of physical, physiological, behavioural activities takes place. The decrease in wear and tear, neurohormonal changes, the rate of metabolism, somatic mutations take place. Replacement of organs does not take place in ageing.

So, the correct option is ‘Epimorphosis’.

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

Most accepted theory of ageing is

  1. Death of brain cells

  2. Non-functioning of a-cells in pancreas

  3. Less RBC in blood

  4. Non-functioning of thymus gland
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Immunity theory is the widely accepted theory for ageing. 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 ‘Non functioning of thymus gland’.

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

"Genes in somatic cells undergo mutation with time and cause senescence. This theory belongs to ________________.

  1. Error and damage theories

  2. Hormonal theory

  3. Immunological theories

  4. Programmed senescence theory
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Error and damage theories - emphasize environmental assaults to living organisms that induce cumulative damage at various levels as the cause of aging.

B. Hormonal theory - hormones or reduced production of hormones might cause aging has also led some to believe that they could be an anti-aging elixir. 

C. Immunological theory - asserts that the process of human aging is, in fact, a mild and generalized form of prolonged auto-immune phenomenon.

D. Programmed senescence theory - refers to the idea that senescence in humans and other organisms is purposely caused by evolved biological mechanisms in order to obtain an evolutionary advantage.

So, the correct option is ‘Error and damage theories’.

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

The sperms that are not ejaculated are reabsorbed in the-

  1. Corpus epididymis

  2. Cauda epididymis

  3. caput epididymis

  4. Vas deferens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
If a man has an inactive sex life and can’t even be bothered to pleasure himself, sperm that stores up inside his body without being released will eventually die and be reabsorbed into his body like so much horse manure spread judiciously throughout a cornfield.
So the correct option is ' Corpus epididymis'.
Multiple choice biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

Choose the correct answers from the alternatives given.
When out of oxygen, vertebrate muscle:

  1. produces lactic acid

  2. produces more carbon dioxide

  3. stops functioning

  4. degrades protein
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The repeated contraction of the muscle results in the low concentration of oxygen and this anaerobic condition leads to the accumulation of lactic acid in the muscle. 
So, the correct option is 'produces lactic acid'
Multiple choice biology movement and locomotion in man types of muscles muscles muscles and their structure muscle contraction

Extensor muscles of back have

  1. An aerobic oxidation

  2. Fast rate of contraction

  3. Larger diameter muscle fibers

  4. Abundant in myoglobin
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

Extensor muscles. Attached to the back of the spine, these muscles allow us to stand and lift objects. They include the large muscles in the lower back (erector spinae), which help hold up the spine, and gluteal muscles.

Extensor muscles are one of the examples for red muscles which contains abundant mitochondria and myoglobin. 
Red muscle fibres contract and fatigue more slowly than white fibres and generate ATP by aerobic catabolism of glucose and fats, utilizing myoglobin-bound O2
Myoglobin is abundant and great numbers of mitochondria occur, characterized by slow, sustained (tonic) contraction.
So, the correct answer is 'An aerobic oxidation and Abundant in myoglobin'