Tag: zoology

Questions Related to zoology

Schizophrenia is associated with which of the following drugs?

zoology why do we fall ill health introduction to health health and its maintenance

  1. Cannabis

  2. Cocaine

  3. Amphetamines

  4. All of the above

Show answer
Correct Option: D
Explanation:

Schizophrenia is a mental disorder characterized by abnormal social behaviour and failure to recognize what is real. The word schizophrenia, which translates as 'splitting of mind'. Inhalation or oral intake of certain drugs like cannabis, cocaine, amphetamines results in schizophrenic condition as all these drugs have direct effect on the brain. 

Thus the correct answer is option D.

The full form of ECT is

zoology why do we fall ill health introduction to health health and its maintenance

  1. Electrocardio therapy.

  2. Electrical conduction therapy.

  3. Electroconvulsive therapy.

  4. Electroconvulsive technique.

Show answer
Correct Option: C
Explanation:

ECT is the abbreviation for Electroconvulsive Therapy. Shock treatment (ECT) is suited in some cases and can bring about dramatic improvement in severe depression. In this, electric currents are passed through the brain, intentionally triggering a brief seizure.

Thus, the correct answer is option C.

Epilepsy is a neurological disorder, caused by the abnormal 

zoology why do we fall ill health introduction to health health and its maintenance

  1. Virual infection in brain

  2. Bacterial infection in brain

  3. Electrical discharge from neuron of the brain

  4. Fungal infection in brain

Show answer
Correct Option: C
Explanation:

Epilepsy is a group of neurological disorders characterized by epileptic seizures. Epileptic seizures are episodes that can vary from brief and nearly undetectable to long periods of vigorous shaking and there is unconsciousness. Epilepsy occurs due to abnormal electrical discharge from neuron of the brain.

Thus, the correct answer is option C.

John, a male hemophiliac, marries Jane, a normal woman, and together they have four children, two boys (Mark and Mike) and two girls (Molly and Mary). None of the children display the symptoms of hemophilia. Mark, Mike, Molly, and Mary all marry normal individuals and have children. None of Mark's or Mike's children, male or female, display symptoms of hemophilia, but the sons of Molly and Mary all display symptoms of hemophilia while the daughters of Molly and Mary do not. If one of Mike's daughters marries a normal man, what is the probability that one of their children will display symptoms of hemophilia?

zoology why do we fall ill health introduction to health health and its maintenance

  1. 0%

  2. 25%

  3. 50%

  4. 75%

  5. 100%

Show answer
Correct Option: A
Explanation:
Haemophilia is a sex-linked recessive disorder. Gene responsible for it present on X chromosome and only expresses in a dominant state. Out of four children of John (haemophiliac male) and Jane (normal woman), both the girls Molly and Mary become a carrier for haemophilia as they got haemophiliac X chromosome from John, which they pass on to their children resulting sons with haemophilia expressed and daughters are either normal or carrier. The boys Mark and Mike are normal as they don't get haemophiliac X chromosome from father and when they married with normal individuals, all children would be normal. Thus, the correct answer is '0%.'

The range of biomagnification of DDT in an aquatic food chain, if starting from 0.003 ppb level in water may go at fish-eating bird level upto:

zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

  1. 0.3 ppm

  2. 3.0 ppm

  3. 30.0 ppm

  4. 0.003 ppm

Show answer
Correct Option: B
Explanation:

The pesticides and nondegradable. They have much affinity for fats. Hence, they tend to move into living organisms. They get concentrated as they move up the food chains. For example at each trophic level, the accumulation of insecticide is increased by 10 times. For example, if the goat gets one part per million of DDT from the grass is it will have 10 parts per million in its tissues. The man eating the good will have 100 PPM. The man-eating tiger will have thousand PPM. If the food chain is still greater the accumulation will still be higher. Is increasing accumulation of insecticide and the higher organism is called biomagnification which is biological amplification.

So, the correct option is '3ppm'

Which among the following is likely to have the highest levels of DDT deposition in its body?

zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

  1. Sea gull

  2. Phytoplankton

  3. Eel

  4. Crab

Show answer
Correct Option: A
Explanation:

Chlorinated hydrocarbons like DDT pass into the food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat. Among the given animals, seagull which is a fish-eating bird and is present at a higher trophic level will have high levels of DDT deposition in its body.

DDT residues are rapidly passed through food chain causing biomagnification because DDT is

zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

  1. Water soluble

  2. Lipid soluble

  3. Moderately toxic

  4. Non-toxic to aquatic animals

Show answer
Correct Option: B
Explanation:
DDT is a chlorine containing pesticide used in agriculture. DDT is rapidly passed through food chain causing biomagnification because it is stable, accumulates in the soil and concentrates in the fatty tissue or internal organs of body (as DDT is fat soluble substance). So, DDT takes may years to break down and it enters into body of other organisms with predation. So the amount of DDT biomagnifies.
So, the correct answer is 'Lipid soluble'.

Which of the following causes bio-magnification?

zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

  1. $ { SO } _{ 2 } $

  2. Mercury

  3. DDT

  4. Both (b) and (c)

Show answer
Correct Option: D
Explanation:

Biomagnification refers to increase in concentration of toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well-known for mercury and DDT.

Which of the following statements is not correct regarding biomagnification?


(i) Mercury accumulated by an organism cannot be metabolised.
(ii) In the process of biomagnification, concentration of DDT is increased at successive trophic levels.
(iii) Accumulation of cadmium can cause thinning of eggshells in birds.
(iv) DDT accumulation is a major cause of a reduced population of fish-eating birds.
(v) Biomagnification occurs only in the aquatic food chain

zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

  1. (i), (iii) and (v)

  2. (iii) and (iv)

  3. (iii) and (v)

  4. (i), (ii) and (iv)

Show answer
Correct Option: C
Explanation:

The higher amounts of pesticide like DDT, disturb calcium metabolism of birds resulting in thinning of egg shells and their premature breaking. This is a major cause of reduction of population of fish eating birds. Biomagnification is found in all types of food chains.

The biological amplification of DDT in the various trophic levels is known as.

zoology our environment - our concern biomagnification the effects of human activities on ecosystems bioaccumulation and biomagnification

  1. Green house effect

  2. Biomagnification

  3. Eutrophication

  4. Pollution

Show answer
Correct Option: B
Explanation:

The amplification of a toxic compound which is resistant to elimination from the body and accumulates with each trophic level is known as Bioaccumulation/Biomagnification.

So, the correct option is 'Biomagnification'.