Tag: animal behaviour

Quizzes (4) Questions (149)

Questions Related to animal behaviour

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

Which of the following hormones stimulates the production of milk?

  1. LH

  2. Prolactin

  3. Oxytocin

  4. Progesterone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Prolactin is the hormone that stimulates milk production. During pregnancy, prolactin stimulates growth of the breast, but high estrogen and progesterone secretion prevent milk production. After delivery, estrogen and progesterone levels drop, and prolactin stimulates the secretion of milk by alveolar cells in the breast.

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

Some hormones check the milk from being secreted by the mammary glands till the birth of young ones even though the glands are all prepared to do so. They are

  1. Progesteron and prolactin

  2. Prolactin and FSH

  3. Oestrogen and prolactin

  4. Oestrogen and progesteron
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Progesterone and prolactin check the milk from being secreted by the mammary glands till the birth of young ones even though the glands are all prepared to do so. Progesterone is a hormone released by the corpus luteum in the ovary. Changing progesterone levels can contribute to abnormal menstrual periods and menopausal symptoms. Prolactin is a hormone named originally after its function to promote milk production (lactation) in mammals in response to the suckling of young after birth. It has since been shown to have more than 300 functions in the body. These can be divided into a number of areas: reproductive, metabolic, regulation of fluids (osmoregulation), regulation of the immune system (immunoregulation) and behavioural functions.
At birth, prolactin levels remain high, while the delivery of the placenta results in a sudden drop in progesterone, oestrogen, and HPL levels.
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Lemmings reduce their number by committing suicide every

  1. Eight years

  2. Alternate years

  3. Four years

  4. Two years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lemmings reduce their number by committing suicide every 4 years. It has been regarded as a collective suicide, conscious or involuntary, caused by overpopulation. In reality, being solitary rodents by nature, when the population booms, the stronger lemmings drive the weaker and younger ones off long before the food is depleted.

Therefore, the correct answer is option (C).

Multiple choice biology selection and evolution ethology animal behaviour natural selection

The idea of natural selection as the fundamental process of evolutionary changes was reached by:

  1. Charles Darwin and Alfred Russel Wallace in 1900

  2. Charles Darwin in 1866

  3. Alfred Russel Wallace in 1901

  4. Charles Darwin and Alfred Russel Wallace in 1859
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Charles Darwin and Alfred Russel Wallace independently formulated the theory of natural selection, which was presented to the Linnean Society in 1858 and published in Darwin's 'On the Origin of Species' in 1859.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Identify the true statement:

  1. Mutations are adaptive and occur according to the changes in the environment.

  2. Genetic drift is the random fluctuations in the allele frequencies in large population.

  3. Natural selection is the difference in reproduction that causes difference in the contribution of alleles of next generation.

  4. Mutations are directional and occurs in the individuals of a population.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Natural selection is defined by differential reproductive success based on heritable traits, which leads to changes in allele frequencies over generations.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Which is known as "The living laboratory of evolution"?

  1. Galapagos islands

  2. Western Ghats

  3. Mediterranean sea

  4. Atlantic forest
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Galapagos Islands are famous for their unique biodiversity and the role they played in inspiring Darwin's theory of evolution by natural selection.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

Natural selection means _________________.

  1. Nature selects desirable characters

  2. Nature rejects undesirable characters

  3. Nature reacts with an organism

  4. a, b
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural selection is the process where individuals with traits better suited to their environment are more likely to survive and reproduce, effectively selecting for desirable characters.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

The modern synthetic theory of evolutions\assumes a positive role of which of the following in evolution?
a. Natural selection
b. Acquired characters
c. Artificial selection
d. Mutations.

  1. $1$ and $2$
  2. $1$ and $3$
  3. $2, 3$ and $4$
  4. $1$ and $4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The modern synthetic theory of evolution incorporates natural selection as the primary directional force and mutations as the source of genetic variation. Acquired characters and artificial selection are not considered core natural driving mechanisms in this evolutionary model.

Multiple choice biology selection and evolution ethology animal behaviour natural selection

State whether the following statements are true or false .
Guttation takes place through specialised pores called lenticels.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Guttation is a process of oozing out of the xylem sap on the margin of the leaves through specialized openings called hydathodes. Guttation is also known as bleeding of the leaf.

So, the given statement is false.