Why do sound waves move faster through the ground than through the air?
A.
Particles of matter are packed more loosely in the ground than in the air.
B.
Particles of matter are packed more tightly in the ground than in the air.
C.
Air doesn’t contain any particles of matter to transmit sound waves.
D.
The elevation of the ground is lower than the elevation of the air space.
Answers
Answer:
Biology MCQs for Class 12 with Answers Chapter 9 Strategies for Enhancement in Food Production
November 16, 2019 by Veerendra
Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 9 Strategies for Enhancement in Food Production. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Biology Strategies for Enhancement in Food Productione MCQs Pdf with Answers to know their preparation level.
Strategies for Enhancement in Food Production Class 12 Biology MCQs Pdf
1. The technique of obtaining a large number of plantlets by tissue culture method is known as
(a) organ culture.
(b) micropropagation.
(c) plantlet culture.
(d) macropropagation.
Answer
2. Viral disease-free plants are obtained through
(a) anther culture.
(b) shoot meristem culture.
(c) ovary culture.
(d) leaf-cell culture.
Answer
3. Breeding of crops to increase the levels of essential nutrients, is called
(a) biofortification.
(b) biomagnification.
(c) bioinformatics.
(d) biotechnology.
Answer
4. The species of Saccharum (sugarcane) originally grown in North India.is
(a) S. munja.
(b) S. officinarum.
(c) S. barberi.
(d) All of these.
Answer
5. Inbreeding is carried out in animal husbandry because it [NCERT Exemplar]
(a) increases vigour.
(b) improves the breed.
(c) increases heterozygosity.
(d) increases homozygosity.
Answer
6. A group of animals which are related by descent and share many similarities are referred to as [NCERT Exemplar]
(a) breed.
(b) race.
(c) variety.
(d) species.
Answer
7. The biggest constraint of plant breeding is [NCERT Exemplar]
(a) availability of desirable gene in the crop and its wild relatives.
(b) infrastructure.
(c) trained manpower.
(d) transfer of genes from unrelated sources.
Answer
8. Which one of the following combination would a sugarcane farmer look for in the sugarcane crop? [NCERT Exemplar]
(a) Thick stem, long intemodes, high sugar content and disease resistant.
(b) Thick stem, high sugar content and profuse flowering.
(c) Thick stem, short intemodes, high sugar content, disease resistant.
(d) Thick stem, low sugar content, disease resistant.
Answer
9. A collection of all the alleles of all the genes : of a crop plant is called [NCERT Exemplar]
(a) germplasm collection.
(b) protoplasm collection.
(c) herbarium.
(d) somaclonal collection.
Answer
10. Which one of the following is a marine fish? [NCERT Exemplar]
(a) Rohu
(b) Hilsa
(c) Catla
(d) Common Carp
Answer
11. Inbreeding increases ______ .
Answer/Explanation
12. A single ______ helps to overcome inbreeding depression.
Answer/Explanation
13. ______ obtained through apiculture is used in cosmetics and polishes.
Answer/Explanation
14. ______ variety of wheat is resistant hill bunt disease.
Answer/Explanation
15. Pusa Komal is the variety of ______ that is resistant to bacterial blight.
Answer/Explanation
16. ______ is used in the production of single cell protein.
Answer/Explanation
17. A poultry farm typically includes chicken and ______ .
Answer/Explanation
18. In MOET, the cow is administered hormones with ______ activity.
Answer/Explanation
19. Mule is produced by hybridisation.
Answer/Explanation
20. mothers are involved in MOET.
Answer/Explanation
21. Match the items in Column I with those in Column II.
Column I
(Variety of Crop)Column II
(Resistant to)A. Pusa Komal of cowpea1. Hill BuntB. Pusa Swamim of Brassica2. Blackrot and curl blightC. Pusa Shubhra of Cauliflower3. Bacterial blightD. Himgiri of Wheat4. Leaf curl5. White rustAnswer/Explanation
22. Match the items in Column I with those in Column II.
Column IColumn IIA. Somaclones1. SpirulinaB. Atlas 66 of wheat2. Resistance to yellow mosaic in mung beanC. Mutation breeding3. Lysine and tryptophan-richD. Single cell protein4. High protein contentE. Maize hybrids5. Micro-propagationAnswer/Explanation
Answer:
B) Particles of matter are packed more tightly in the ground than in air.