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1. In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?

P-depolarization of the atria

S-start of systole

T-end of diastole

R-polarization of ventricles

Question 1 of 21

2. What is the best pH of the soil for cultivation of plants?

4.5 __ 8.5

5.5 __ 6.5

6.5 __ 7.5

3.4 __ 5.4

Question 2 of 21

3. The technique of obtaining large number of plantlets by tissue culture method is called?

organ culture

macro-propagation

micro-propagation

plantlet culture

Question 3 of 21

4. Which of the micro-organism is used for production of citric acid in industries?

Rhizopus nigricans

Lactobacillus bulgaris

Penicillium citrinum

Aspergillus niger

Question 4 of 21

5. Which of the following plant species you would select for the production of bio ethanol?

Jatropha

Polygamist

Brassica

Zea mays

Question 5 of 21

6. An important step in the manufacture of pulp for paper industry from the woody tissues of plants is the?

removal of oils present in the wood by treatment with suitable chemicals

removal of water from the wood by prolonged heating at approximately 50 C

preparation of pure cellulose by removing lignin

treatment of wood with chemical that breakdown cellulose

Question 6 of 21

7. Farmers in a particular region were concerned that per-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

Frequent irrigation of the crop

Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid

Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer

Application of iron and magnesium to promote synthesis of chlorophyll

Question 7 of 21

8. The Ti plasmid is often used for making transgenic plants. This plasmid is found in?

Azotobacter

Rhizobium of the roots of leguminous plants

Agrobacterium

Yeast as a 2 m plasmid

Question 8 of 21

9. Gel electrophoresis is used for?

construction of recombinant DNA by joining with cloning vectors

separation of DNA fragments according to their size

cutting of DNA into fragments

isolation of DNA molecule

Question 9 of 21

10. Polyethylene glycol method is used for?

biodiesel production

energy production from sewage

gene transfer without a vector

seedless fruit production

Question 10 of 21

11. Which one of the following proved effective for biological control of nematodal diseases in plants?

Pseudomonas cepacia

Paecilomyces lilacinus

Pisolithus tinctorius

Gliocladium virens

Question 11 of 21

12. Two bacteria found to be very useful in genetic engineering experiments are?

Nitrosomonas and Klebsiella

Escherichia and Agrobacterium

Rhizobium and Diplococcus

Nitrobacter and Azotobacter

Question 12 of 21

13. A transgenic food crop which may help in solving the problem of night blindness in developing countries is?

Bt soybean

Flavr savr tomatoes

Golden rice

starlink maize

Question 13 of 21

14. Which one of the following is being tried in India as a bio fuel substitute for fossil fuels?

Musa

Azadirachta

Aegilops

Jatropha

Question 14 of 21

15. Main objective of production/ use of herbicide resistant GM crops is to?

eliminate weeds from the field without the use of manual labor

encourage Eco-friendly herbicides

eliminate weeds from the field without the use of herbicides

reduce herbicide accumulation in food particles for health safety

Question 15 of 21

16. Consider the following statements about biomedical technologies.

(A) During open heart surgery blood is circulated in the heart-lung machine.

(B) Blockage in coronary arteries is removed by angiography.

(D) X-ray provides clear and detailed images of organs like prostate glands and lungs.

Which two of the above statements are correct?

C and D

B and C

A and C

A and B

Question 16 of 21

17. Human insulin is being commercially produced from a transgenic species of?

Saccharomyces

Escherichia

Rhizobium

Bacterium

Question 17 of 21

18. Cry-I endotoxins obtained from Bacillus thuringiensis are effective against?

flies

nematodes

mosquitoes

boll worms

Question 18 of 21

19. Which one thing is not true about antibiotics?

The term "antibiotic" was coined by Selman Waksman in 1942?

Some persons can be allergic to a particular antibiotic

First antibiotic was discovered by Alexander Flemming

Each antibiotic is effective only against one particular kind of germ

Question 19 of 21

20. What is antisense technology?

RNA polymerase producing DNA

When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene

Production of monoclonal variants in tissue cultures

A cell displaying a foreign antigen used for synthesis of antigens

Question 20 of 21

21. Introduction of food plants developed by genetic engineering is not desirable because?

there is danger of introduction viruses and toxins with introduced crop

these products are less tasty as compared to the already existing products

economy of developing countries may suffer

this method is costly

Question 21 of 21

Test Name	CBSE Biology in Human Welfare Test
Subject	CBSE Biology
Test Type	MCQs
Total Question	21
Total Marks	42
Total Time	20 Minutes
Test Help For	CBSE Biology. CBSE Board Exams. Entrance Exams. Admissions Test. Jobs Test. General Knowledge. All Grades Exams.

Test By Subject	CBSE
Test By Topics	Biology in Human Welfare

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CBSE Biology in Human Welfare Test Online

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