Tag: zoology

Questions Related to zoology

In Cockroach, ootheca is formed by secretion of

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Phallic gland

  2. Mushroom gland

  3. Colleterial gland

  4. All the above

Show answer
Correct Option: C
Explanation:

The colleterial glands open into the vestibulum and secrete most of the protein and tanning agent. The protein may not be directly concerned with ootheca formation, while the latter probably secretes the alkali-resistant outer layer of the ootheca.
The anterior and posterior parts of cockroach secreting the structural protein which produces most of the material used in the formation of the ootheca.

So the correct answer is "Colleterial gland".

Young Cockroach is called

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Maggot

  2. Nymph

  3. Ephyra

  4. Pupa

Show answer
Correct Option: B
Explanation:

Cockroach eggs hatch because of the combined pressure of the hatchlings within. Upon emerging from the egg case, or ootheca, this immature form of cockroach is known as a nymph or baby cockroach. Nymphs are bright white in color initially. Cockroach nymphs are grayish-brown in color and darken with each progressive molt.  Cockroach nymphs undergo a series of molts. They emerge as full adults from their final molt.

So the correct answer is 'Nymph'.

Male cockroach is identified by the presence of

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Green gland

  2. Anal style

  3. Anal cercus

  4. Broad abdomen

  5. Colleterial gland

Show answer
Correct Option: B
Explanation:

The abdomen is made up of 10 segments. The 7th, 8th and 9th sterna form a genital pouch in females. In males, the genital pouch is present at the hind end of the abdomen. The male cockroach has thread-like anal styles, which are missing in the female cockroach. Hence, Male Cockroach is identified by the presence of anal style.

So the correct answer is 'Anal style'.

Choose the correct answer from the allternatives given.
In which of these organs sperms are nourished and stored in cockroach

zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. Testes

  2. Utricular gland

  3. Ejaculatory duct

  4. Conglobate gland

Show answer
Correct Option: C
Explanation:

In cockroaches, the sperm is stored in the seminal vesicles and are glued together in the form of bundles called spermatophores and discharged during copulation. Seminal vesicles are the part of the ejaculatory duct.

So, the correct option is 'Ejaculatory duct'.

In cockroach, the ootheca is formed by the secretion of 
zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. phallic gland

  2. collaterial gland

  3. mushroom gland

  4. conglobate gland

Show answer
Correct Option: B
Explanation:

Collaterial glands are present in female cockroach as part of reproductive system. These glands are branched tubular glands opening independently on the dorsal side of the genital chamber. The secretion produced by these glands forms the oothecal case of ootheca.

Consider the following four statements (i)- (iv) and select the correct option stating which ones are true (T) and which ones are false (F)
(i) In male cockroach, genital pouch or chamber lies at the hind end of abdomen bounded dorsally by 9th and 10th terga and ventrally by the 9th sternum.
(ii) In cockroach, the haemolymph is composed of colourless plasma and haemocytes
(ii) In female cockroach each ovary is formed of a group of ten ovarian tubules or ovarioles, containing a chain developing ova
(iv) In cockroach the nymph grows by moulting about 13 times to reach the adult form.
zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. (i)- F; (ii)- T; (iii)- F; (iv)- T

  2. (i)- F; (ii)- F; (iii)- T; (iv)- T

  3. (i)- T; (ii)- T; (iii)- F; (iv)- T

  4. (i)- T; (ii)- F; (iii)- T; (iv)- f

Show answer
Correct Option: C
Explanation:

In female cockroach, each ovary is formed of a group of eight ovarian tubules or ovarioles, containing a chain of developing ova.

The development of Periplaneta americana is
zoology study of animal type - cockroach introduction to reproduction reproduction in cockroach reproductive system of cockroach

  1. holometabolous

  2. paurometabolous

  3. ametabolous

  4. heminetabolous

Show answer
Correct Option: B
Explanation:

The development of Periplaneta americana is paurometabolous, i.e., there is development through nymphal stage.

Transformation of the early reducing atmosphere of the earth into an oxidizing atmosphere was mainly due to the activities of

zoology concept of life theories of the origin of life origin of life the origin of cells and cell division

  1. Aerobic photosynthesizers

  2. Anaerobic heterotrophs

  3. Anaerobic photosynthesizers

  4. Anaerobic chemoheterotrophs

Show answer
Correct Option: A
Explanation:

Cyanobacteria are thought to be the first aerobic photosynthesizers evolved which gradually increased the oxygen portion of atmosphere changing it into oxidising one. The aerobic respiration was thus helpful for the animals to survive.

Thus, the correct answer is option A. 

In antarctica, ozone depletion is due to the formation of which of the following compounds?

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. Acrolein

  2. PAN

  3. PCBs

  4. Chlorine nitrate

Show answer
Correct Option: D
Explanation:

Ozone layer depletion is caused due to CFC's. So, chlorine nitrate, which is found in the stratosphere causes break down of the ozone layer. Chlorine is highly reactive and it interacts with ozone and hence destroys the ozone layer.

Which of the following is responsible for the depletion of the ozone layer in the upper stratosphere of the atmosphere?

zoology allotropy of oxygen ozone - a case study stratospheric pollution ozone and its depletion

  1. Polyhelogens

  2. Ferrocenes

  3. Fullerenes

  4. Freons

Show answer
Correct Option: D
Explanation:

Freons are chlorofluorocarbons and are responsible for depletion of ozone layer.