Two species of Amoeba X and Y were kept in fresh water and got adapted. Species X developed contractile vacuole. When both were transferred to sea water and got adapted, both X and Y lost their contractile vacuole. From these observation we conclude that [AFMC 1983, AIIMS 1983]

Both X and Y are marine species

Species Y is marine and X is fresh water

Species X is marine and Y is fresh water

Assertion : Slime moulds show alternation of generation. Reason : The sporangia bearing slime moulds represent haplophase.

If both the assertion and reason are false

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

If the assertion is false but reason is true

Assertion : Sandfly transmits Kala-azar. Reason : In Kala-azar, the parasite damages the brain.

If both the assertion and reason are false

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

If the assertion is false but reason is true

Assertion : The interval between the entry of the sporozoite into human blood and the appearance of the fever is called incubation period. Reason : The incubation period of malaria in man is about 7 days.

If both the assertion and reason are false

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

If the assertion is false but reason is true

Explore topic-wise MCQs in Biology.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.

1.	Two species of Amoeba X and Y were kept in fresh water and got adapted. Species X developed contractile vacuole. When both were transferred to sea water and got adapted, both X and Y lost their contractile vacuole. From these observation we conclude that [AFMC 1983, AIIMS 1983]
A.	Both X and Y are marine species
B.	Species Y is marine and X is fresh water
C.	Species X is marine and Y is fresh water
D.	Both X and Y are fresh water
Answer» D. Both X and Y are fresh water

Discussion

2.	In humans, schizont stage of Plasmodium is found in[MP PMT 2003]
A.	Liver cells only
B.	Liver, spleen and blood cells
C.	RBCs and liver cells
D.	RBCs only
Answer» D. RBCs only

Discussion

3.	Motile elongate zygote of Plasmodium occurs in [CPMT 1999]
A.	Human RBCs
B.	Human liver
C.	Salivary glands of mosquito
D.	Gut of mosquito
Answer» E.

Discussion

4.	Chromatid bodies occurs in Entamoeba during [APMEE 1996; Pb. PMT 1999; AIIMS 2002]
A.	Precyst stage
B.	Early cysts
C.	Tetranucleate cysts
D.	Trophozoites
Answer» C. Tetranucleate cysts

Discussion

5.	Assertion : Slime moulds show alternation of generation. Reason : The sporangia bearing slime moulds represent haplophase.
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
E.	If the assertion is false but reason is true
Answer» D. If both the assertion and reason are false

Discussion

6.	Assertion : Sandfly transmits Kala-azar. Reason : In Kala-azar, the parasite damages the brain.
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
E.	If the assertion is false but reason is true
Answer» D. If both the assertion and reason are false

Discussion

7.	Assertion : The interval between the entry of the sporozoite into human blood and the appearance of the fever is called incubation period. Reason : The incubation period of malaria in man is about 7 days.
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
E.	If the assertion is false but reason is true
Answer» D. If both the assertion and reason are false

Discussion

Explore topic-wise MCQs in Biology.

Two species of Amoeba X and Y were kept in fresh water and got adapted. Species X developed contractile vacuole. When both were transferred to sea water and got adapted, both X and Y lost their contractile vacuole. From these observation we conclude that [AFMC 1983, AIIMS 1983]

In humans, schizont stage of Plasmodium is found in[MP PMT 2003]

Motile elongate zygote of Plasmodium occurs in [CPMT 1999]

Chromatid bodies occurs in Entamoeba during [APMEE 1996; Pb. PMT 1999; AIIMS 2002]

Assertion : Slime moulds show alternation of generation. Reason : The sporangia bearing slime moulds represent haplophase.

Assertion : Sandfly transmits Kala-azar. Reason : In Kala-azar, the parasite damages the brain.

Assertion : The interval between the entry of the sporozoite into human blood and the appearance of the fever is called incubation period. Reason : The incubation period of malaria in man is about 7 days.