Biology Test 10

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Biology Test 10

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Weekly Quiz Competition

Question 1
4 / -1

Assertion: Hepatopancreas of prawn is equivalent to the liver and pancreas of higher animals. ,
Reason: Hepatopancreas stores the absorbed nutrients from stomach and midgut. ,

Read the assertion and reason carefully to mark the correct option out of the option given below :

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C
If the assertion is true but the reason is false

D
If both the assertion and reason are false

Solution

The hepatopancreas is a gland located around the stomach and midgut of the alimentary canal of prawn. It serves the role of pancreas, intestinal glands and liver of higher animals, because, it secretes hepatopancreatic juice which contains the enzymes for digesting carbohydrates, lipids and proteins. The duct from hepatopancreas opens into the stomach and the enzymes of hepatopancreatic juice acts upon the food present in the stomach. Digested foods are then absorbed from the stomach and midgut and get strored in the hepatopancreas.
Question 2
4 / -1

A bryophyte suddenly started reproducing parthenogenetically. The number of chromosomes of the second generation compared to parent plant will be

A
Same

B
One-Half

C
Double

D
Triple

Solution

The number of chromosomes of the second generation will be same because no reduction division takes place.
Question 3
4 / -1

When the sperms of Funaria and Pteris are put together near the archegonia of Pteris, only the sperms of Pteris readily enter the archegonia and reach the egg. The reason being that

A
Sperms of Funaria are killed when mixed with sperms of Pteris

B
Archegonia of Pteris secrete a substance with repels sperms of Funaria

C
Archegonia of Pteris secrete a chemical substance which attracts sperms of Pteris chemotactically

D
Sperms of Funaria are less motile

Solution

Because archegonia of Pteris secrete a chemical malic acid which attracts only sperms of Pteris chemotactically.
Question 4
4 / -1

Assertion: Skeleton helps in blood cell formation. ,
Reason: Blood flows through skeleton. ,

Read the assertion and reason carefully to mark the correct option out of the options given below:

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C
If the assertion is true but the reason is false

D
If the assertion is false but reason is true

Solution

Skeleton is made up of several bones and cartilages. Bone marrow is a soft and semisolid fatty neurovascular tissue, present inside the bones and carries the tissues for the formation of blood cell. Both the erythrocytes and leucocytes are produced in the red bone marrow present in the interstices of the spongy bones of vertebrae, sternum, scapula and in the ends of long bones, such as humerus and femur. Blood is a connective tissue whose continual flow in the blood vessels maintains a fairly constant environment for the body cells.
Question 5
4 / -1

Assertion: In hyperglycemia, the blood glucose level becomes increase. ,
Reason: Insulin secretion is elevated above the normal range

A
If both Assertion and Reason are true and Reason is the correct explanation for Assertion

B
If both Assertion and Reason are true and Reason is not the correct explanation for Assertion

C
If Assertion is true and Reason is false

D
If Assertion is false and Reason is true

Solution

In hyperglycemia or diabetes mellitus, the blood glucose level becomes rise due to slow secretion of the insulin hormone from β -cells of Langerhans. In this, some of the glucose is excreted in the urine and water follows the glucose this causing excessive urination and dehydration of body tissues.
Question 6
4 / -1

Pick out the correct statements ,

(i) Cytokinins especially help in delaying senescence ,
(ii) Auxins are involved in regulating apical dominance ,
(iii) Ethylene is especially useful in enhancing seed germination ,
(iv) Gibberellins are responsible for immature falling of leaves

A
(i) and (iii) only

B
(i) and (iv) only

C
(iv) and (ii) only

D
(i) and (ii) only

Solution

Ethylene promotes ripening of food & Leaf abscission. It also inhibits stem elongation.
Gibberlins promotes seed germination, Stem growth and fruit development, inhibit winter dormancy.
Question 7
4 / -1

Accessory gland associated with the genital organs in female rats are ,

(i) Vestibular bartholins ,
(ii) Cowper's gland ,
(iii) Ampullary gland ,
(iv) Vesicular gland

A
(i) and (ii)

B
(iii) and (ii)

C
(i) only

D
(iv) only

Solution

Vestibular Bartholin glands are the accessory glands associated with the female reproductive system. The glands are located subcutaneously within the wall of the vaginal opening and secrete lubricating fluid into the vestibule and vaginal opening during the coitus.
Question 8
4 / -1

One of the following plant species is in endangered list

A
Eucalyptus

B
Nepenthes

C
Ceratophyllum

D
Delonix

Solution

Nepenthes, also known as tropical pitcher plants or monkey cups, is a genus of carnivorous plants in the monotypic family Nepenthaceae. Due to changes in the environmental condition now it is in endangered list.
Question 9
4 / -1

Which of the following is expected to have the largest value (gm/m²yr) in a grassland ecosystem?

A
Secondary Production (SP)

B
Tertiary Production (TP)

C
Gross Production (GP)

D
Net Production (NP)

Solution

The rate of total capture of energy of total production of organic material is gross primary productivity while the balance or biomass remaining after meeting the cost of respiration of producers is not primary productivity. Hence, gross productivity has highest value in grassland ecosystem.

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Biology Test 10

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Question 1

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and reason are false

Solution

Question 2

Same

One-Half

Double

Triple

Solution

Question 3

Sperms of Funaria are killed when mixed with sperms of Pteris

Archegonia of Pteris secrete a substance with repels sperms of Funaria

Archegonia of Pteris secrete a chemical substance which attracts sperms of Pteris chemotactically

Sperms of Funaria are less motile

Solution

Question 4

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If the assertion is false but reason is true

Solution

Question 5

If both Assertion and Reason are true and Reason is the correct explanation for Assertion

If both Assertion and Reason are true and Reason is not the correct explanation for Assertion

If Assertion is true and Reason is false

If Assertion is false and Reason is true

Solution

Question 6

(i) and (iii) only

(i) and (iv) only

(iv) and (ii) only

(i) and (ii) only

Solution

Question 7

(i) and (ii)

(iii) and (ii)

(i) only

(iv) only

Solution

Question 8

Eucalyptus

Nepenthes

Ceratophyllum

Delonix

Solution

Question 9

Secondary Production (SP)

Tertiary Production (TP)

Gross Production (GP)

Net Production (NP)

Solution

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