Biology Test - 22

Result

Biology Test - 22

Score
-
out of -
Rank
-
out of -

TIME Taken - -

Weekly Quiz Competition

Question 1
5 / -1

Read the following statements and select the correct option.

Statement 1: Malarial parasite requires two hosts - humans and mosquitoes to complete its life cycle.

Statement 2: Haemozoin is a toxic substance produced by the rupturing of liver cells during malarial infection.

A
Both statements 1 and 2 are correct

B
Statement 1 is incorrect but statement 2 is correct

C
Statement 1 is correct but statement 2 is incorrect

D
Both statements 1 and 2 are incorrect

Solution

Malarial parasite requires two hosts - humans and mosquitoes to complete its life cycle. Mosquito acts as a primary host and human acts as a secondary host. Haemozoin is a toxic substance produced by the rupturing of red blood cells.
Question 2
5 / -1

Given below is the diagram of human lymphatic system, where A, B, C and D are lymphoid organs. Select incorrect option regarding the lymphoid organs labelled as A, B, C and D.

A
T cells mature in B

B
B and T cells undergo maturation in C

C
B and T cells undergo proliferation and differentiation in A

D
B cells mature in D

Solution

'A'-lymph nodes, 'B'-Thymus, 'C'-spleen, 'D'-Bone marrow. Thymus and bone marrow are the primary lymphoid organs where maturation of T-cells and B-cells take place respectively. Lymph nodes and spleen are the secondary lymphoid organs where T-cells and B-cells undergo proliferation and differentiation.
Question 3
5 / -1

The inflammatory response in allergy is due to the release of ________ by mast cells.

A
Histamine

B
Antigens

C
Mucus

D
Antibodies

Solution

Inflammatory response in allergy is due to the release of histamine by mast cells.

Histamine along with IgE antibodies act as allergy mediator.

It dilates arteries and causes fluid accumulation which causes the inflammatory response.
Question 4
5 / -1

Match List I with List II:

Choose the correct answer from the options given below:

A
A-I, B-III, C-II, D-IV

B
A-IV, B-III, C-I, D-II

C
A-III, B-I, C-IV, D-II

D
A-II, B-IV, C-III, D-I

Solution

To correctly match List I (Diseases) with List II (Pathogen Types), we need to understand the causative agents for each disease listed in List I.

Details for each disease:

Typhoid: This is a bacterial infection caused by Salmonella typhi. Hence, it matches with "Bacteria".

Leishmaniasis: This disease is caused by parasitic protozoans of the genus Leishmania. Therefore, it corresponds to "Protozoa".

Ringworm: Despite its name, ringworm is not caused by a worm. It’s a fungal infection on the skin, caused by various types of fungi. So, Ringworm should be associated with "Fungus".

Filariasis: Also known as lymphatic filariasis, this condition is caused by infection with parasites classified as nematodes (roundworms) of the family Filarioidea. Thus, it matches with "Nematode".

With this understanding:

A should be paired with IV (Bacteria).

B should be paired with III (Protozoa).

C should be paired with I (Fungus).

D should be paired with II (Nematode).

Corresponding to the options provided:

Option A: A-I, B-III, C-II, D-IV - Incorrect

Option B: A-IV, B-III, C-I, D-II - Correct!

Option C: A-III, B-I, C-IV, D-II - Incorrect

Option D: A-II, B-IV, C-III, D-I - Incorrect

Therefore, the correct answer is Option B: A-IV, B-III, C-I, D-II.
Question 5
5 / -1

Biogas generation is a three-stage anaerobic digestion of animal and other organic wastes. Study the following flow chart and select the correct option for stages I, II and Ill.

A
In stage - I, anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers.

B
In stage - II, monomers are converted into organic acids by fermentation causing microbes.

C
In stage - Ill, organic acids are acted upon by methanogenic bacteria to produce biogas.

D
All of these.

Solution

In stage - I, anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers.

In stage - II, monomers are converted into organic acids by fermentation causing microbes.

In stage - Ill, organic acids are acted upon by methanogenic bacteria to produce biogas.
Question 6
5 / -1

A microbial biocontrol agent that can be used to control butterfly caterpillars is:

A
Trichoderma polysporum

B
Bacillus thuringiensis

C
Streptococcus

D
Mycorrhiza

Solution

An example of microbial biocontrol agent is bacteria Bacillus thuringiensis (Bt).

It can be introduced in order to control butterfly caterpillars.

These are available in sachets as dried spores that are mixed with water and sprayed onto vulnerable plants such as Brassica and fruit trees, where these are eaten by the insect larvae. In the gut of larvae, the toxin is released and the larvae get killed. The bacterial disease will kill the caterpillars, but leaves other insect uharmed.
Question 7
5 / -1

Directions For Questions

Study the following statements regarding lactic acid bacteria (LAB) which are used to convert milk into curd.

(i) They produce adds that coagulate and partially digest the milk proteins.

(ii) A small amount of curd added to the fresh milk as an inoculum contains millions of LAB, which at suitable temperature, multiply and convert milk into curd.

(iii) Conversion of milk into curd improves its nutritional quality by increasing vitamin B₁₂.

(iv) LAB may result in acidity in the stomach of human beings.

...view full instructions

Which of the given statements are correct?

A
(i) and (ii)

B
(ii) and (iii)

C
(i), (ii) and (iii)

D
(i), (ii), (iii) and (iv)

Solution

Microbes such as. Lactobacillus and others commonly called lactic acid bacteria (LAB) grow in milk and convert it into curd. During growth, such bacteria produce adds (mainly lactic add) that coagulate and partially digest the milk proteins. A small amount of curd, known as starter, is added to the milk and kept at a suitable temperature, where lactic acid bacteria multiply in millions and converts milk into curd that also improves its nutritional quality by increasing vitamin B₁₂. It also checks the growth of disease-causing microbes in the stomach.
Question 8
5 / -1

Match column I with column II and select the correct answer from the codes given below.

A
A-(ii) B-(iii) C-(iv) D-(i)

B
A-(ii) B-(iv) C-(i) D-(iii)

C
A-(iii) B-(i) C-(ii) D-(iv)

D
A-(iv) B-(ii) C-(i) D-(iii)

Solution

Tricoderma is a biocontrol agent.

Streptomyces is the source of antibiotic streptomycin.

Azospirillum is a free-living nitrogen fixing bacteria.

Lactobacillus produces lactic acid.
Question 9
5 / -1

The flow chart given below represents the process of recombinant DNA technology. Identify A, B, C and D

A
A-Restriction endonuclease, B-Restriction endonuclease, C-Hydrolase, D-Transduction

B
A-Restriction endonuclease, B-Restriction endonuclease, C-DNA ligase, D-Transformation

C
A-Restriction endonuclease, B-Restriction endonuclease, C-Hydrolase, D-Transformation

D
None of these

Solution

A and B are restriction endonucleases because same restrction enzyme cuts both foreign DNA and vector DNA at specific Point. C is DNA ligase which joins foreign DNA to vector DNA The newly formed recombinant DNA is transformed in bacteria and tha bacterial cells are allowed to divide.
Question 10
5 / -1

The enzyme (a) is needed for isolating genetic material from plant cells and enzyme (b) for isolating genetic material from fungus. Choose the correct pair of options from the following :

A
(a) Cellulase (b) Lipase

B
(a) Cellulase (b) Protease

C
(a) Cellulase (b) Chitinase

D
(a) Chitinase (b) Lipase

Solution

Option (3) is the correct answer because cellulase is used to isolate genetic material from plant cells and chitinase is used to isolate genetic material from fungal cells.

Option (2) is incorrect because protease is used for digestion of proteins.

Option (1) and (4) are incorrect because lipase is used for the breakdown of lipids.