Tag: zoology

Questions Related to zoology

Choose the correct answers from the alternatives given.
Which of the germ layers is best associated with development Of the heart?

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Ectoderm

  2. Mesoderm

  3. Endoderm

  4. All of these

Show answer
Correct Option: B
Explanation:

The ectoderm, which is made up of columnar cells, forms the epidermis of the skin, nervous system, cornea, lens, retina, salivary glands and the enamel of teeth. The mesoderm gives rise to the dermis of skin, gonads, heart, blood and lymph, kidney, reproductive ducts and most of the muscles. The last layer, the endoderm gives rise to the gastric and intestinal glands, liver, pancreas, lining of the middle ear.

So the correct option is 'Mesoderm'.

The fluid released from the vagina lust prior to childbirth is

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Baby's accumulated urine

  2. Amniotic fluid

  3. Mothers plasma from the umbilical cord

  4. Baby's plasma from its fetal circulation

Show answer
Correct Option: B
Explanation:

The amniotic fluid is the protective liquid contained by the amniotic sac of a gravid amniote. This fluid serves as a cushion for the growing fetus but also serves to facilitate the exchange of nutrients, water, and biochemical products between mother and fetus. Amniotic fluid is present from the formation of the gestational sac. The forewaters are released when the amnion ruptures prior to childbirth.

So the correct option is 'amniotic fluid'.

During parturition which joint allows smooth movement of the foetus?

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Amphiarthrosis

  2. Syndesmoses

  3. Pubicsmphysis

  4. Gomphosis

Show answer
Correct Option: A
Explanation:

During pregnancy in the human, hormones such as relaxin allows the pelvic bones to be more flexible for delivery. The gap of the symphysis pubis, normally is 4–5 mm but during pregnancy there is an increase by at least 2–3 mm. The symphysis pubis separates to some degree during childbirth hence pubic symphysis is an amphiarthrodial joint.

So, the correct option is 'Amphiarthrosis'.

Milk secretion is caused by :-

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Progesterone

  2. PRH

  3. PRL

  4. Oxytocin

Show answer
Correct Option: D
Explanation:

Oxytocin is a peptide hormone secreted by the posterior pituitary. It is also a neuropeptide, used for inter-neuron communication. This hormone is responsible for secretion or ejection of milk. PRH or prolactin releasing hormone is responsible for the release of Prolactin or PRL, which is a hormone responsible for milk production. Progesterone inhibits lactation during pregnancy.

So, the correct option is 'Oxytocin'.

What is "After birth" referred to?

zoology menustral cycle in human parturition and lactation pregnancy and birth fertilization and post fertilization in humans

  1. Amniotic fluid passing out

  2. Expulsion of baby

  3. Expulsion of placenta, umbilical cord and foetal membrane

  4. Secretion of hormone relaxin

Show answer
Correct Option: C

Which of the following are the correct approaches to reduce global warming ?
(i)   Use of fossil fuels 
(ii)   Improving efficiency of energy usage 
(iii)  Afforestation
(iv)  Increasing growth of human population

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (i), (ii) and (iii)

Show answer
Correct Option: B
Explanation:

To reduce global warming following measures must be taken:
(i)  cutting down the use of fossil fuel
(ii)  Improving efficiency of energy usage
(iii) Reducing deforestation
(iv) Planting trees and slowing down the growth of human population.

In the event of global warming, which one of the following is most likely to occur?

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Existing plant and animal communities will move North in response to warming.

  2. Agriculture in the prairie provinces will be redeveloped on soils of the Canadian Shield.

  3. The anticipated rise in sea level will be caused primarily by the melting of polar ice caps.

  4. The decomposition of organic matter in the unfrozen surface layer of polar soils will increase.

Show answer
Correct Option: C
Explanation:
It is believed that increase in concentration of greenhouse gases has resulted in rise of atmospheric temperature which is slight in tropics, moderate in middle latitudes and maximum in polar regions. Global warming could raise sea level due to thermal expansion of sea water, melting of glaciers and Greenland ice sheet. There is a danger of submersion of large area as one third of human population lives within 60 km of coastline. Coastal salt marshes and estuaries, wetlands, drylands, freshwater supplies, fisheries, fish breeding areas and other types of wildlife will undergo extinction.
So, the correct answer is 'The anticipated rise in sea level will be caused primarily by the melting of polar ice caps'.

Which of the following would happen in the presence of greenhouse effect in the atmosphere?

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Pollution will increase

  2. The earth's surface temperature will increase

  3. The earth's surface temperature remains the same,

  4. The depleted ozone layer will decrease the earth's temperature.

Show answer
Correct Option: B
Explanation:

Greenhouse gas like co$ _2$, methane, CFC absorbs the radiation reflected from the earth's surface in the form of heat and increases the atmosphere's temperature is called as greenhouse effect which leads to the global warming.

Global warming will cause.

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Rise is level of oceans

  2. Decrease in glaciers

  3. Reduction in ice caps

  4. All the above

Show answer
Correct Option: D
Explanation:

Global warming causes melting of polar ice caps. This decreases the size of glaciers and leads to the rise of oceans.

So, the correct option is 'All of the above'.

If global warming continues, organism facing severe threat is?

zoology global environmental change causes of greenhouse effect global warming adaptation in animals

  1. Banana

  2. Dolphin

  3. Cow

  4. Snow Leopard

Show answer
Correct Option: D
Explanation:
Global warming is the continuous increase in temperature of earth's surface due to increase in concentration of greenhouse gases. The rise in temperature leads to melting of polar ice caps and this will lead to rise in sea level, due to which many coastal areas will get submerged.
Hence, if global warming continues, Snow Leopard will face severe threat as ice will melt due to global warming and its natural habitat will get destroyed.
So, the correct answer is 'Snow Leopard'.