CBSE
Multiple Choice QuestionsGenetic diversity in agricultural crops is threatened by
introduction of high yielding varieties
intensive use of fertilizers
extensive intercropping
intensive use of biopesticides
Assertion : Inbreeding produces pureline.
Reason : It causes homozygosity.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Which of the following is a correct match between crop, variety and resistance to diseases?
| Crop | Variety | Resistance to diseases |
| Wheat | Himgiri | White rust |
| Brassica | Pusa sadabahar | Black rot |
| Cowpea | Pusa komal | Bacterial blight |
| Chilli | Pusa swarnim | Chilly mosaic virus |
Which of the following species has the chromosome complement similar to that of Triticum aestivum ?
Zea mays
Secale cereale
Gossypium
Aegilops
Somaclonal variation appears in
organisms produced through somatic hybridization
plants growing in highly polluted conditions
apomictic plants
tissue culture raised plants
The map given below indicates the Former and the present distribution of an animal. Which animal could it be:
Wild ass
Nilgai
Black buck
Lion
Assertion: Fish meal is a rich source of protein for cattle and poultry.
Reason: Fish meal is produced from non-edible parts of fishes like fins, tail etc.
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false.
Which of the following is correct match?
| Disease | Pathogen |
| Wilt disease | Synchytrium |
| Citrus canker | Xanthomonas |
| Red rot of sugarcane | Ustilago |
| Powdery mildew | Fusarium |
Assertion : Rice field is an ecosystem for plants and animals.
Reason : Gut of human/animals is an ecosystem for flora and fauna.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
A child took sugar cane and sucked its juice. Regarding this which of the follwoing match is correct?
| Substrate | Enzyme | Site of secretion of enzyme | Products formed |
| Proteins | Pepsin | Duodenum | Polypeptides |
| Starch | Amylase | Salivary glands | Glucose |
| Lipids | Lipase | Pancreas | Fat globules |
| Sucrose | Invertase | Duodenum | Glucose + Fructose |
