Tag: zoology

Questions Related to zoology

| | List I | | List II | | A | Internal fertilization | 1 | Ovum | | B | External fertilization | 2 | Sperm | | C | Male gamete | 3 | Hen | | D | Female gamete | 4 | Hydra | | E | Budding | 5 | Frog | | F | Binary fission | 6 | Fertilised egg | | G | Zygote | 7 | Amoeba |

lifespan reproduction and variation zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. A- 3, B- 5, C- 1, D- 2, E- 4, F- 7, G- 6

  2. A- 3, B- 5, C- 2, D- 1, E- 7, F- 4, G- 6

  3. A- 3, B- 5, C- 2, D- 1, E- 4, F- 7, G- 6

  4. A- 6, B- 5, C- 2, D- 1, E- 4, F- 7, G- 3

Show answer
Correct Option: C
Explanation:

The fertilization which takes place inside the female's body is called internal fertilization, hen shows internal fertilization.
The fertilization which takes outside the female's body is called external fertilization as in the case of frogs.
Sperm is the male reproductive cell or the male gamete.
Ovum is the female reproductive cell or the female gamete.
Budding is a form of asexual reproduction in which a new organism develops from an outgrowth or bud due to the cell division at that particular site as in case of hydra.
Binary fission is a form of asexual reproduction used by all prokaryotes (including amoeba) where the cell divides into two nearly equal-sized daughter cells.
A zygote is a diploid cell that is formed by the fusion of male and female gamete. So, the fertilized egg is the zygote.
Thus, the correct answer is option C.

Which of the following plants reproduce without forming seeds?

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Mango

  2. Sugarcane

  3. Rose

  4. Both B and C

Show answer
Correct Option: D
Explanation:

Seed is the product of ripened ovule after fertilization by pollen grains. These seeds further grow into a new plant. Some plants are reproduced without forming seeds but through the asexual reproduction. New sugarcane plants are produced from a mature sugarcane stem, rose from branch and potato from another potato. 

So the correct option is "Sugar cane and Rose".

Which of the following is the mode of asexual reproduction?

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Budding

  2. Spore formation

  3. Binary fission

  4. All of the above

Show answer
Correct Option: D
Explanation:
Asexual reproduction is a mode of reproduction in which, a new offspring is produced from a single parent. Some of the types of asexual reproductions are binary fission (e.g. Amoeba, bacteria), budding (e.g. Hydra), fragmentation (e.g. Planaria), spore formation (e.g. ferns) and vegetative propagation (e.g. Onion).
So, the correct answer is 'All of the above'.

Meiosis is a must in asexual reproduction.

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Meiosis does not occur during asexual reproduction. Meiosis is the process of producing gametes which is occur in sexual reproduction. On the other hand, mitosis is simply the process of cell division in asexual reproduction. This is the process that animals are going through during regeneration. 

So, the correct option is 'False'.

Parathormone deficiency in man causes

zoology control and coordination in living organisms parathyroid gland thyroid and parathyroid gland thyroid, parathyroid and thymus gland

  1. Hypercalcemia

  2. Hypocalcaemia

  3. Goitre

  4. All of the above

Show answer
Correct Option: B
Explanation:

A low level of parathyroid hormone (hypoparathyroidism) can cause hypocalcemia, which results when too much calcium is lost in urine or when not enough calcium is moved from bones into the blood. 

Parathormone deficiency leads to

zoology control and coordination in living organisms parathyroid gland thyroid and parathyroid gland thyroid, parathyroid and thymus gland

  1. Decrease of $Ca^{+2}$ level in blood

  2. Increase of $Ca^{+2}$ level in blood

  3. Osteoporosis

  4. None of the above

Show answer
Correct Option: A
Explanation:

Hypoparathyroidism is the state of decreased secretion or activity of parathyroid hormone (PTH). This leads to decreased blood levels of calcium (hypocalcemia) and increased levels of blood phosphorus (hyperphosphatemia).

Hyper secreation of Parathyroid hormone result in ___________________.

zoology endocrine system and chemical co-ordination parathyroid gland thyroid and parathyroid gland thyroid, parathyroid and thymus gland

  1. Stronger bones due to increased incorporation of calciuim in them.

  2. Deposition of calcium in various skeletal structure.

  3. No effect on the constitution of bones

  4. Weaker bones due to increased removal of calcium from them

Show answer
Correct Option: B
Explanation:

 A parathyroid gland tumor can prompt hypersecretion of PTH. This can raise blood calcium levels so excessively that calcium deposits begin to accumulate throughout the body, including in the kidney tubules. When calcium levels in your blood fall too low, your parathyroid glands secrete enough PTH to restore the balance but sometimes these glands produce an excess amount of hormone, leading to abnormally high levels of calcium (hypercalcemia) and low levels of phosphorus in your blood.

So, the correct answer is 'Deposition of calcium in various skeletal structures.'

Philips Collip discovered which of the following hormones?

zoology endocrine system and chemical co-ordination parathyroid gland thyroid and parathyroid gland thyroid, parathyroid and thymus gland

  1. Parathyroid hormone

  2. Thyroxine

  3. ADH

  4. Oxytocin

Show answer
Correct Option: A
Explanation:

Bovine parathormone is a large polypeptide having 84 amino-acids. It was discovered and purified by Philips Collip in 1925. 

All are the function of PTH except ______________________.

zoology endocrine system and chemical co-ordination parathyroid gland thyroid and parathyroid gland thyroid, parathyroid and thymus gland

  1. PTH simulates bone reabsorption /dilution /demineralization

  2. PTH retards osteoclastic action

  3. PTH increases $Ca^{+2}$ abosorption from the digestive tube

  4. PTH stimulates reabsorption of $Ca^{+2}$ by the renal tubules

Show answer
Correct Option: A
Explanation:
The hormone released by the parathyroid glands is called the parathyroid hormone (PTH). It is also called parathyrin. This hormone is involved in the formation or mineralization of bones. It is released when the levels of calcium ions in the blood serum decreases.
Hence, the correct answer is 'PTH simulates bone reabsorption /dilution /demineralization'.

Increase in bleeding time and delay in blood coagulation is due to the deficiency of which hormone?

zoology endocrine system and chemical co-ordination parathyroid gland thyroid and parathyroid gland thyroid, parathyroid and thymus gland

  1. Thyroxine

  2. Adrenaline

  3. Noradrenaline

  4. Parathormone

Show answer
Correct Option: D
Explanation:
  • In humans, four parathyroid glands are present on the back side of the thyroid gland, one pair each in the two lobes of the thyroid gland.
  • The parathyroid glands secrete a peptide hormone called parathyroid hormone (PTH) or parathormone.
  • Parathormone increases the $Ca^{2+}$ levels in the blood.
  • Increase in bleeding time and delay in blood coagulation is due to the deficiency of parathormone because its deficiency causes a decrease in blood calcium levels and calcium ion is essential for blood coagulation.
  • So, the correct answer is 'Parathormone'.