Tag: coordination in human beings- chemical control

Questions Related to coordination in human beings- chemical control

Read the following passage and answer the following question.
A group of 10 newly hatched chicks was separated into two smaller groups containing five chicks each. One group (Group A) was left with the mother hen, the other group (Group B) was taken shortly after hatching and kept with a mother goose. The chicks in Group A displayed normal behavior and followed the mother hen around. The chicks in Group B followed the mother goose around and exhibited goose like behavior, such as swimming. After one week, Group B was reunited with the mother hen, but ignored her, and instead continued to follow the mother goose around the barnyard. If exposed to a mother pig during the period shortly after hatching, the chicks in Group B would exhibit

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. Pig like behaviour

  2. Goose like behaviour

  3. Chick like behaviour

  4. Unique behaviour

  5. Unknown behaviour

Show answer
Correct Option: A
Explanation:

A form of learning that occurs during a brief genetically determined critical period shortly after birth is called as imprinting. Because the chicks learnt to follow mother goose and mother hen just after birth; it is imprinting. If they were exposed to mother pig shortly after hatching, they would exhibit pig like behavoiur.

Thus, the correct answer is option (A).

Read the passage and answer the following question.
Mimicry is an important biotic factor in communities all over the world. For instance, viceroy butterflies closely resemble (mimic) monarch butterflies. Birds that eat viceroys enjoy a good meal, but those that eat monarchs retch right away. The behaviour of viceroy butterfly describes the type of mimicry is

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. Mullerian

  2. Aggressive

  3. Crypsis

  4. Batesian

  5. Deflection

Show answer
Correct Option: D
Explanation:

Batesian mimicry refers to the resemblance of a harmless or palatable species with that of a dangerous or unpalatable one to make predators avoid them. It is opposite to Mullerian mimicry wherein dangerous, unpalatable, or poisonous species resemble one another to make predator recognize them easily. Viceroy butterflies mimic distasteful monarch butterflies to avoid predation, exhibiting Batesian mimicry. Predators or parasites exhibiting resemblance to harmless model so that their respective prey/host can not identify them exhibit aggressive mimicry. Crypsis (being not obvious to predator) and deflection (mimicry, camouflage etc) are antipredator behaviours. Thus, the correct answer is option D.

In batesian mimicry, one species resembles another, poisonous species. 
I. Poisonous species is more common than mimic
II. Poisonous species is present in same area as mimic
III. Poisonous species competes for resources with mimic
IV. Poisonous species is distinctly or brightly colored

The effectiveness of batesian mimicry can be increased by

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. I and II

  2. I, II and III

  3. I, II and IV

  4. II, III and IV

  5. I, II, III and IV

Show answer
Correct Option: C
Explanation:

Batesian mimicry refers to the resemblance of a harmless or palatable species with that of a dangerous or unpalatable one to make predators avoid them. A more common and distinct poisonous species present in the same area as mimic become familiar to predators of mimic and thereby increase the effectiveness of mimicry. Competition between mimic and poisonous species would harm either of them while mimicry is an adaptation for the protection of mimic. Thus, the correct answer is option C.

A behavioral strategy of adaptation called echolocation is found in 

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. bats

  2. butterfly

  3. praying mantiis

  4. arctic tern

Show answer
Correct Option: A
Explanation:

Bats are nocturnal flying mammals which do not employ eyesight for location of their path. food place of rest etc. They produce high frequency sound which produces echoes after striking various objects on the principle of sonar. Echoes are then analysed by bats to know their path.  

The bird which can imitate human speech is

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. Pisttacula

  2. Hierococcyx

  3. Upapa

  4. Molpaster

Show answer
Correct Option: A
Explanation:
Members of the parrot genus Pisttacula or afroasion ring necked parakeets can imitate human speech.
So, the correct answer is 'Pisttacula'.

Which of the following hormones does not have a particular target organ in the body?

biology control and coordination in living organisms hormones coordination in human beings- chemical control endocrine system in humans

  1. Growth hormone

  2. TSH

  3. Oxytocin

  4. FSH

Show answer
Correct Option: A
Explanation:

Growth hormone secreted by the anterior pituitary has a widespread effect in the body. It stimulates growth of various body cells, promotes protein anabolism, absorption of calcium from bowel and conversion of glycogen to glucose.

____________ acts a transporter of hormones in animals.

biology control and coordination in living organisms hormones coordination in human beings- chemical control endocrine system in humans

  1. Spinal fluid

  2. Blood

  3. Cell

  4. All of the above

Show answer
Correct Option: B
Explanation:

  • Blood is the medium of transport of animal hormones. The tissues that produce the hormones are known as the effectors while those tissues that are influenced by the effectors are called targets. Hormones are of low molecular weight and they diffuse readily. 
  • The effects brought about by the hormones are not permanent as they get readily oxidized. 

Therefore, the correct answer is option B.

Chemically hormones are 

biology control and coordination in living organisms hormones coordination in human beings- chemical control endocrine system in humans

  1. Biogenic amines

  2. Proteins, steroids and biogenic amines

  3. Proteins only

  4. Steroids only

Show answer
Correct Option: B
Explanation:

Hormones are a diverse group of biochemicals, which perform a variety of roles in biological systems. Hormones are produced in endocrine glands. Hormones are responsible for maintenance of internal balance and developmental changes in the animal body. 

Chemically, hormones may be peptide (e.g., insulin), amines (e.g., catecholamines), proteins (e.g., growth hormone), steroid hormones (e.g., androgens). 

Ecdysone is secreted by

biology control and coordination in living organisms hormones coordination in human beings- chemical control endocrine system in humans

  1. Prothoracic gland

  2. Corpora allata

  3. Corpora cardiaca

  4. None of the above

Show answer
Correct Option: A
Explanation:

Insects go through a process of moulting during their life cycle. The process is controlled by hormones like moulting hormone and juvenile hormones. Ecdysone is a steroidal prohormone of the major insect molting hormone, which is secreted from the prothoracic glands. Insect molting hormones (ecdysone and its homologues) are generally called as ecdysteroids.

Hormones are

biology control and coordination in living organisms hormones coordination in human beings- chemical control endocrine system in humans

  1. Produced in low amount

  2. Sometimes diffusible

  3. Non-antigenic

  4. All of the above

  5. Both A and C

Show answer
Correct Option: D
Explanation:

Hormones are powerful. It takes only a tiny amount to cause big changes in cells or even whole body. Hormones are chemicals produced by special cells in glands and other organs of the body; most hormones are produced by cells in the endocrine glands. These hormones, which are produced in very small amounts, are released into the bloodstream and travel to the target organ or tissue where they exert their effect. That is why too much or too little of a certain hormone can be serious. Not all the hormones are easily diffusible. Among the diffusible lipid-soluble molecules are steroid hormones. Hormones are nonantigenic that is no antibody formation occurs against hormones.