Structural Organisation in Animals Test

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Structural Organisation in Animals Test - 82

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Weekly Quiz Competition

Question 1
1 / -0

Number of earthworms found in one acre of land is approximately

A
500

B
5000

C
50,000

D
5 lakh

Solution

Darwin reported about 50,000 earthworms per acre of land. They deposit about 18 tonnes of earth per year per acre in the form of 1 castings. the castings increases the fertility of the soil. So, the correct answer is option C.
Question 2
1 / -0

Exonephric secretion in earthworm is by

A
Septal nephridia

B
Pharyngeal nephridia

C
Integumentary nephridia

D
Both B and C

Solution

The integumentary nephridia are minute and are found in each segment. Each integumentary nephridium is V-shaped and opens outside through nephridiopore. Nephrostomes are absent. As the waste products are directly put outside the body, the integumentary nephridia are of an exonephric type. So, the correct answer is option C.
Question 3
1 / -0

Wings of cockroach are mainly helpful in

A
Egg laying

B
Preying

C
Finding the mate

D
Protect against odds

Solution

The cockroach will not use its wings to escape predators or a threat but will instead dart into holes and cracks. So, the wings helps the cockroaches to protect against any odds.
Therefore, the correct answer is option D.
Question 4
1 / -0

Size of cocoon of earthworm is

A
1 to 2 m.m

B
2.0 to 2.4 m.m

C
2.0 to 2.4 c.m

D
5 to 8 m.m

Solution

The cocoon is barrel shaped and is of light yellow or amber colour. The cocoon measures about 2.0-2.5 mm in length. It is secreted by the clitellum where the sperms are stored. So, the correct answer is option B.
Question 5
1 / -0

Septal nephridia of earthworm are

A
Responsible for excretion

B
Present in all body segments

C
Responsible for keeping the surface moist

D
Present in 4, 5, 6 segments

Solution

The septal nephridia of the earthworm are the largest and are situated in four rows on the intersegmental septa in each segment behind the fifteenth. The terminal duct of septal nephridium is a short tube and many ducts open into a pair of septal excretory ducts situated along the septum in each segment. The septal excretory duct open and pour their contents into a pair of supra intestinal excretory duct. These longitudinal excretory ducts open into the lumen of the intestine.
Therefore, the correct answer is option A.
Question 6
1 / -0

Similarity between man and earthworm is

A
Both are nephrotelic

B
Both are ammonotelic

C
Both are ureotelic

D
Both are uricotelic

Solution

Ureotelic organisms are those that excretes excess nitrogen as urea. Urea is their major excretory product. Earthworms and humans both excrete urea as a major excretory product. So, they both are ureotelic. Ammonotelic and uricotelic organisms excrete excess nitrogen as ammonia and uric acid respectively. So, the correct answer is option C.
Question 7
1 / -0

Which is correct about earthworm?

A
It can crawl on smooth surface easily

B
It secretes cocoon around unfertilized eggs

C
It has brain but no head

D
It has no locomotory organs

Solution

Earthworms have a brain that connects with nerves from their skin and muscles but does not have a distinct head. They have setae, which helps in locomotion. They secrete cocoon around fertilised eggs. So, the correct answer is option C.
Question 8
1 / -0

Which structure is represented typically in every segment of earthworm?

A
Septal nephridia

B
Hearts

C
Genital pores

D
Ganglia

Solution

Heart present in pairs in four segments - 7, 9, 12 and 13.
Genital pore is present as two pairs, one in the 17th segment and one in 19th segment.
The earthworm's nervous system is controlled by its cerebral ganglion. The ventral nerve cord is attached to the ganglion in the anterior segments, and it runs through the length of the body. In each segment of the body, segmental ganglion attaches to the ventral nerve, forming a complete nervous system.
So, the correct answer is option D.
Question 9
1 / -0

Septal nephridia of earthworm discharge excretory product into

A
Body cavity

B
Pharynx

C
Outside on body surface

D
Lumen of intestine

Solution

The septal nephridia of the earthworm are the largest and are situated in four rows on the intersegmental septa in each segment behind the fifteenth. The terminal duct of septal nephridium is a short tube and many ducts open into a pair of septal excretory ducts situated along the septum in each segment. The septal excretory duct open and pour their contents into a pair of supraintestinal excretory duct. These longitudinal excretory ducts open into the lumen of the intestine. So, the correct answer is option D.
Question 10
1 / -0

Origin of nephridia in earthworm is

A
Ectodermal

B
Endodermal

C
Mesodermal

D
None of the above

Solution

Earthworms are triploblastic and they have three prominent germ layers known as endoderm, mesoderm and ectoderm. The nephridia occur in pairs and performs a function similar to the vertebrate kidney. They remove metabolic wastes from an animal's body. The nephridia of the earthworm are of ectodermal origin. So, the correct answer is option A.

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Structural Organisation in Animals Test - 82

Result

Structural Organisation in Animals Test - 82

Score

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Rank

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SHARING IS CARING

Question 1

500

5000

50,000

5 lakh

Solution

Question 2

Septal nephridia

Pharyngeal nephridia

Integumentary nephridia

Both B and C

Solution

Question 3

Egg laying

Preying

Finding the mate

Protect against odds

Solution

Question 4

1 to 2 m.m

2.0 to 2.4 m.m

2.0 to 2.4 c.m

5 to 8 m.m

Solution

Question 5

Responsible for excretion

Present in all body segments

Responsible for keeping the surface moist

Present in 4, 5, 6 segments

Solution

Question 6

Both are nephrotelic

Both are ammonotelic

Both are ureotelic

Both are uricotelic

Solution

Question 7

It can crawl on smooth surface easily

It secretes cocoon around unfertilized eggs

It has brain but no head

It has no locomotory organs

Solution

Question 8

Septal nephridia

Hearts

Genital pores

Ganglia

Solution

Question 9

Body cavity

Pharynx

Outside on body surface

Lumen of intestine

Solution

Question 10

Ectodermal

Endodermal

Mesodermal

None of the above

Solution

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