Tag: zoology

Questions Related to zoology

Which of the following helps in differentiation of lymphocytes?

zoology endocrine system and chemical co-ordination mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

  1. Cytosin

  2. Thymosin

  3. Cyclin

  4. None of the above

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Correct Option: B
Explanation:

  • Thymosin hormones are typically produced by the thymus gland and trigger the creation of T-cells, which are used by the immune system to fight disease. 
  • Once puberty occurs in a human, a normal thymus has created the T-cells needed by the body and begins to shrink, eventually being replaced by fatty tissue. Hence, Thymosin helps in the differentiation of lymphocytes.
So, the correct answer is 'Thymosin'.

The LH surge is essentially a signal sent from the brain to the ovary,which indicates

zoology endocrine system and chemical co-ordination mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

  1. Onset of implantation

  2. An egg is mature

  3. Fertilization

  4. None of the above

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Correct Option: B
Explanation:

  • The LH surge causes the initiation of the process of ovulation. 
  • After ovulation, the follicle is transformed into the corpus luteum, which is stimulated by LH.
  •  It occurs roughly 36 hours before ovulation which indicates egg has matured and is ready for fertilisation. Hence, The LH surge is essentially a signal sent from the brain to the ovary, which indicates An egg is mature.
So, the correct answer is 'An egg is mature'.

Which hormone is antagonistic to calcitonin?

zoology endocrine system and chemical co-ordination mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

  1. TSH

  2. Parathyroid

  3. Thyroxine

  4. None of the above

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Correct Option: B
Explanation:

  • Parathyroid hormone (PTH) is essential for the physiologic maintenance of mineral homeostasis. 
  • PTH regulates the mineral transport in bone and kidney and through its secondary actions on mineral transport in the intestine. 
  • Calcitonin, in many ways, acts as a physiologic antagonist to PTH. Hence,  Parathyroid hormone is antagonistic to calcitonin
So, the correct answer is 'Parathyroid'.

The cells which produces erythropoietin

zoology endocrine system and chemical co-ordination mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

  1. Juxtaglomerular cells

  2. Hepatic cells

  3. Glandular cells

  4. None of the above

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Correct Option: A
Explanation:
  • Erythropoietin is produced by interstitial fibroblasts in the kidney in close association with the peritubular capillary and proximal convoluted tubulin the cell named juxtaglomerular cells. 
  •  It is also produced in perisinusoidal cells in the liver. Hence, The cells which produce erythropoietin Juxtaglomerular cells.
    • So, the correct answer is 'Juxtaglomerular cells'.

Which of these is made by using chemicals?

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Organic manure

  2. Biofertilizers

  3. Natural insecticides

  4. Pesticides

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Correct Option: D
Explanation:

Organic manure is the substance made up of animal and human excreta and plants wastes. Biofertilizer is the fertilizer made up of living or dried microorganism. Natural insecticides are the substance used to kill the harmful insect. It is made up of plant products and microorganisms. They have no negative impact on the environment. While pesticide is the synthetic substance used to kill the harmful pest. It is made of a chemical in factories. It can involve in the food chain and cause harmful effects to the environment.

Primary consumers have more ................ than the secondary consumers.

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Bioaccumulation 

  2. Calorific value

  3. Population density

  4. All of the above

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Correct Option: A
Explanation:

The accumulation of chemicals in the living cells is known as bioaccumulation. When there is excessive use of the pesticides for the protection of fruits and vegetables against the harmful pests, this may lead to its accumulation in the food products. When these products are consumed, the chemicals deposit in the fatty tissues of the host. The concentration of the chemicals goes on reducing with the increase in the trophic level of the consumers. So, the primary consumers will have more bioaccumulation than the secondary consumers. 

Thus, the correct answer is option A.

The increase in the copy of a gene which expresses itself to release enzyme which breaks the pesticides into less toxic chemicals is a 

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Parasitic mechanism

  2. Protective mechanism

  3. Negative feedback mechanism

  4. All of the above

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Correct Option: B

Which of the following determines the action of protective enzyme?

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Catalyses the removal of hydrogen atoms from a particular molecule

  2. Phosphorylation of hexose

  3. Breaks the pesticide into less toxic chemicals

  4. Both A and C

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Correct Option: C

Pests developed with ............. contributes to pests resistance more quickly.

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1.  Shorter generation times

  2. Longer generation times

  3. Shorter lifespan

  4. None of the above

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Correct Option: A
Explanation:
 Generation time is the average time required to complete one generation. Food quality & temperature are two factors that are responsible to produce an impact on the generation time. Pesticide resistance is the reduced susceptibility of a pest towards a pesticide, which earlier effectively controlled the pest. Hence, pests with short generation time increase rapidly as they develop resistance to pesticides more quickly as compared to pests with longer generation time.
So, the correct answer is 'Shorter generation times'

The development of pesticide resistance indicates that

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. The effect of pesticide has increased

  2. The effect of pesticides has decreased

  3. No effect on the action of pesticides

  4. Gradually increases but the effect of pesticides decreases later on

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Correct Option: B