Tag: zoology

Questions Related to zoology

If ovaries from a pregnant woman are removed in 4$^{th}$ month of pregnency, then

zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. Development of embryo becomes abnormal

  2. Abortion occurs after some time

  3. Embryo develops normally till birth

  4. None of the above

Show answer
Correct Option: C
Explanation:

Trophoblast refers to outer cells of a blastocyst that serve in placenta formation in the beginning of the second trimester. It secretes human chorionic gonadotropin that ensures persistence of the corpus luteum. The later serves to secrete ovarian hormone estrogen, progesterone, and relaxin that are required to maintain pregnancy. Hence, removal of ovaries after 4th month would not affect the pregnancy. The correct answer is C.

Leydig cells are meant for 

zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. Formation of sperm

  2. Production of progesterone

  3. Production of testosterone

  4. Nutrition of sperm

Show answer
Correct Option: C
Explanation:

Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They produce testosterone in the presence of luteinizing hormone (LH). 

Progesterone hormone is secreted from 

zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. Placenta

  2. Corpus luteum

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
Explanation:

The corpus luteum in the ovaries is the major site of progesterone production in humans, progesterone is also produced in smaller quantities by the ovaries themselves, the adrenal glands and, during pregnancy, the placenta.

"Anti abortion" hormone is 

zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. Relaxin

  2. Oxytocin

  3. Progestrone

  4. Oestrogen

Show answer
Correct Option: C
Explanation:

Progesterone belongs to a group of steroid hormones called as progestogens. It is mainly secreted by the corpus luteum in the ovary during the second half of the menstrual cycle. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. The progesterone prepares the body for pregnancy in the event, that the released egg is fertilised. If the egg is not fertilised, the corpus luteum breaks down, the production of progesterone falls and a new menstrual cycle begins. Hence, progesterone is called as the 'anti abortion' hormone. 

Which temporary endocrine gland forms in ovary after ovulation? 

zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. Corpus callosum

  2. Corpus albicans

  3. Corpus luteum

  4. Corpus striata

Show answer
Correct Option: C
Explanation:

The corpus luteum is a temporary endocrine structure in female mammals, that is involved in the production of progesterone and moderate levels of estradiol and inhibin. The corpus luteum develops from an ovarian follicle during the luteal phase of the menstrual cycle or oestrous cycle, following the release of a secondary oocyte from the follicle during ovulation. 

Abnormal condition where mammary gland of man become female like is called as 

zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. Gynosism

  2. Gynochorism

  3. Feminization

  4. Gynaecomastia

Show answer
Correct Option: D
Explanation:

Gynaecomastia refers to the presence of enlarged mammary glands in males like that of females and is caused by the presence of extra X chromosome in males. Gonochorism is the unisexual condition. Feminization refers to the development of female secondary sexual characters caused by hormonal changes at puberty in females. So, the correct answer is option D.

Which hormone is responsible for maintenance of pregnancy?

zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

  1. HCG

  2. Progesterone

  3. Estrogen

  4. Prostaglandin

Show answer
Correct Option: B
Explanation:

Progesterone is produced from the corpus luteum, which is the small gland, that forms in the ovary after ovulation has occurred. This hormone is essential for the maintenance of pregnancy and also for the development of many symptoms during early pregnancy.

Which of the following are incorrectly matched

zoology endocrine system and adolescence control of blood glucose endocrine system and hormone hormones in human reproduction

  1. Synthesis reaction-anabolism

  2. Decomposition reaction-catabolism

  3. Hydrolysis-anabolism

  4. Dehydration reaction-synthesis reaction

Show answer
Correct Option: C
Explanation:
Hydrolysis is the cleavage of biomolecules where a water molecule is consumed to affect the separation of a larger molecule into component parts. So, hydrolysis is a type of decomposition and that's why it is regarded as catabolism.
Hence, the correct answer is 'Hydrolysis-anabolism'

Select the correct matching of a hormone , it's source and function.

zoology endocrine system and adolescence control of blood glucose endocrine system and hormone hormones in human reproduction

  1. Vasopressin,  posterior pituitary,  Increase loss of water through urine

  2. Norepinephrine, Adrenal medulla, Increase heartbeat, increase rate of respiration and alertness

  3. Glucagon, Beta-cells of islets of langerhans, stimulates glycogenolysis

  4. Prolactin, Posterior pituitary and mammary glands, Regulates growth and milk formation in females

Show answer
Correct Option: B
Explanation:

Vasopressin is released by the posterior lobe of the pituitary gland and it stimulates the reabsorption of water and electrolytes. 

Norepinephrine is secreted by the adrenal medulla and it increases the alertness, heartbeat and respiratory rate.
Glucagon is released by alpha cells and it increases the blood sugar level.
Prolactin is released by the anterior lobe of the pituitary gland and it helps in the regulation of mammary glands and the formation of milk in them. 
Thus, the correct answer is 'Norepinephrine, Adrenal medulla, Increase heartbeat, increase rate of respiration and alertness.'

The theory that environment can bring about changes in individuals was proposed by :

zoology evolution of life darwin's theory of evolution process of evolution lamarckism

  1. Mendel

  2. Darwin

  3. Lamarck

  4. Lyell

Show answer
Correct Option: C
Explanation:

The first theory of evolution was proposed by Jean Baptiste de Lamarck. Lamarckism proposed:

  • Some internal forces are present in all organisms. By the presence of these forces, the organism has the tendency to increase the size of their organs or the entire body.
  • Environment influences all type of organisms. Changing environment give rise to new needs. New needs or desires produce new structure and change habits of the organism.
  • If an organ is constantly used, it would be better developed whereas disuse of organ results in its degeneration.

So, the correct option is 'Lamarck'.