BT403 Quiz

Shaheen group of bs zoology · Group admin · Muhammad Iqbal Arain · MCQs FILE OF BT403 · FINAL TERM

1. NCWSS is the abrivation of

north central weed science society

2. Name the winter annual

winter wheat

3. Name the prennials....

Alfa alfa

4. Name the summer annuals....

corns or soyabean

5. herbicides are used for......

killing weeds

6. weed killer agent is known as......

herbicides

7. herbicides are used in.........

rotate crops planting new plant scount field cleaning Encourage

8. The external factor that exerts a disadvantageous influence on plant is called...... stress
9. How many types of stress.....

two

10. Name two types of stress.....

biotic stress and Abiotic stress

11. the negative impact of non living factors on a living organism in a specific environment is called.......

Abiotic stress

12. A-biotic factors that lead to a series of morphological, physiological, biochemical, and molecular changes that adversely affect........

plant growth and productivity

13. name the diffirent types of A-biotic factor.......

Water/ drought stress, Heat stress Cold stress Light stress Wind stress

14. There are two types of water stress name the types of water stress.....

flooding drought

15. About how many crops yield is affected by wind stress....

About 50%

16. ......... is one of the major A-biotic stress
17. The accumulation of Na+ and Cl- ions in the cells is very toxic in terms that these ions can influence the ....................

enzymetic action

18. The metals with relatively high densities, atomic weights, or atomic numbers is called........
19. Essential heavy metals required for all kind of plants such as......

Cu for photosynthesis

20. Benificial heavy metals required for specific kind of plants such as.....

Ni for Activation of enzymes

21. damage done to an organism by other living organisms, such as bacteria, viruses, fungi, parasites, beneficial and harmful insects, weeds, and cultivated or native plants is called.........

Biotic stress

22. A plant Disease may be defined as the series of invisible and visible responses of plant cells or tissues to a .................. or an environmental factor.