Tag: zoology

Questions Related to zoology

Somatostatin is produced by

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Adenohypophysis

  2. Neurohypophysis

  3. Pineal gland

  4. Basal part of diencephalon and Pancreas

Show answer
Correct Option: D
Explanation:
Somatostatin is known as growth hormone-releasing inhibiting hormone. It inhibits the release of growth hormone from pituitary gland. Growth hormone stimulates body growth. Somatostatin is secreted from hypothalamus which represents basal part of diencephalon in forebrain. It inhibits the secretion of other pancreatic hormones such as insulin and glucagon.
So, the correct answer is 'Basal part of diencephalon'.

What is the effect of GnRH produced by hypothalamus?

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Stimulates the synthesis and secretion of androgens

  2. Stimulates secretion of milk in mammary glands

  3. Stimulates fetal ejection reflex

  4. Stimulates synthesis of carbohydrates from non-carbohydrates in liver

Show answer
Correct Option: A
Explanation:

Gonadotropin releasing hormone(GnRH), stimulates the anterior lobe of pituitary gland(adenohypophysis) to secrete two gonadotropins, FSH and LH. In males LH stimulates the Leydig's cells of the testis to secrete androgens.

During danger, emotional or during struggle etc., secretion of which hormone increases ____________.

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Vasopressin

  2. Oxytocin

  3. Abscissic acid

  4. Ethylene

Show answer
Correct Option: A

Choose the correct answer from the alternatives given.
Gonadotropin releasing hormone is secreted by:

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. pituitary

  2. hypothalamus

  3. cerebellum

  4. gonads

Show answer
Correct Option: B
Explanation:
GH- RH ( Gonadotropic releasing hormone ) secretes growth hormone (GH). GH or STH (Growth or Somatotropin Hormone) stimulates body growth, protein, fat, and carbohydrate metabolism. The hormone is secreted by adenohypophysis (anterior pituitary). Hypersecretion of this hormone during the period of skeletal growth causes gigantism characterized by excessive growth of bones, with the enlargement of internal organs as well. Hypersecretion in adulthood causes acromegaly. Here the bones become abnormally thick due to ossification of periosteum and thickening of soft tissues as well. 
So the correct answer is hypothalamus.

Match column I with column II and select the correct option from the codes given.

Column I Column II
A. Thyroid (i) Acts on the renal tubules
B. Adrenal (ii) Regulates blood calcium level
C. Pituitary (iii) Maintains diurnal rhythm of our body
D. Pineal (iv) Acts on the meloncytes
zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. A-(iv), B-(iii), C-(ii), D-(i)

  2. A-(iii), B-(iv), C-(i), D-(ii)

  3. A-(iv), B-(ii), C-(iii), D-(i)

  4. A-(ii), B-(i), C-(iv), D-(iii)

Show answer
Correct Option: D
Explanation:

The thyroid gland is composed of stromal cells which release TCT (Thyrocalcitonin ) which regulates the calcium level in the body, Adrenal gland releases aldosterone which acts on renal tubules, Pituitary gland releases MSH which act on melanocytes, Pineal gland acts as a biological clock of body and maintains the diurnal rhythm of our body. So the correct option is ' A-(ii), B-(i), C-(iv), D-(iii)'

Thermoregulatory centre or thermostat in the body of homeothermal animals and man is found in

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Skin

  2. Diencephalon

  3. Hypothalamus

  4. Pituitary

Show answer
Correct Option: C
Explanation:

The hypothalamus of the diencephalon present in the forebrain is called the thermostat of the body because it is responsible for maintaining the temperature of the body through the mechanism of the homeostasis. 

A. Skin acts as a ventilator for perspiration.
B. Diencephalon is a big region, in which hypothalamus is present.
C. Hypothalamus is the thermostat of the body.
D. The pituitary gland is associated with the hypothalamus to perform chemical coordination via hormones.
Hence, the correct answer is 'Hypothalamus'

Lac is secreted by

zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. Dermal glands

  2. Intestinal glands

  3. Salivary glands

  4. Mucosal glands

Show answer
Correct Option: A

Match column I with column II and select the correct option from the given.

Column I Column II
A. Hypothalamus (i) Relaxin
B. Anterior pituitary (ii) Progesterone
C. Testis (iii) FSH and LH
D. Ovary (iv) Androgen
(v) Gonadotropin releasing hormone
zoology endocrine system and chemical co-ordination hypothalamus nervous and endocrine system in humans coordination in human beings- chemical control

  1. A-(v), B-(iii), C-(iv), D-(ii)

  2. A-(v), B-(iii), C-(ii), D-(iv)

  3. A-(i), B-(ii), C-(iv), D-(iii)

  4. A-(iii), B-(v), C-(iv), D-(ii)

Show answer
Correct Option: A
Explanation:

A. Hypothalamus: It is located in the base of the diencephalon. It releases releasor hormone(stimulate anterior pituitary) and inhibiting hormone( inhibit anterior pituitary). So, hypothalamus stimulates gonadotrophin-releasing hormone.

B. Anterior pituitary: It stimulates FSH and LH whose function is to stimulate spermatogenesis in male and growth of ovarian follicle in the female.
C. Testis: It secretes androgen in males such as testosterone whose function develops male reproductive organs and accessory sexual characters.
D. Ovary: It stimulates estrogen and progesterone. Progesterone stops egg production, attaches foetus to the uterine wall.
So, the correct answer is 'A- v, B-iii, C-iv, D-ii'.

What does G.M.O stand for?

zoology applications of biotechnology biotechnological regulations pcr asexual modes of reproduction

  1. Genetically Modified Organism

  2. Growth Maturity Order

  3. Good Maturing Offspring

  4. Gold Medal Order

Show answer
Correct Option: A
Explanation:

GMO stands for Genetically modified organisms. Any organism whose genetic material is modified by the use of genetic engineering technique is known as genetically modified organism. It is basically used to produce biotechnological products for the benefit of mankind.

So, the correct answer is option A.

A genetically manipulated organism containing in its genome one or more inserted gene of another species is called as

zoology applications of biotechnology biotechnological regulations pcr asexual modes of reproduction

  1. Transposon

  2. Gene expression

  3. Transgenic organism

  4. Retroposons

Show answer
Correct Option: C
Explanation:

Transposons are movable DNA sequences that can move (or jump) from one location in the genome to another and are found in bacteria. They leave a copy of themselves in the original position when they move to a new site. This phenomenon is significant  in antibiotic resistance. 

Retroposons are variants of transposons that move via an intermediate RNA form. They transcribe DNA element into RNA which is then reverse transcribed into DNA. This newly formed cDNA is inserted at a new site in the genome. The process of synthesis of a functional gene product using the information from a gene is gene expression. Functional product of protein coding genes is protein, but non-protein coding genes code for as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes. 
Organisms carrying one/more gene or genes from a different species/organism is a transgenic. They are produced to impart advantageous traits which were not there in them.