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Solving time: 4 mins

 Assertion: Stomata are absent in submerged hydrophytes.
Reason: Respiration occurs by means of air chambers in submerged plants.

A
If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

B
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C
If Assertion is true but Reason is false.

D
If both Assertion and Reason are false.

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Text SolutionText solutionverified iconVerified

Stomata are absent in submerged hydrophytes. Air chambers help in gaseous exchange, O liberated during photosynthesis is stored in these chambers and used in respiration. CO released during respiration also remains in these chambers. CO is used in photosynthesis.
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a) Calculate the percentage decline in the death rate for all causes. What generalizations can be made about changes in disease rates that have occurred between 1900 and the present? b) Contrast the changes in death rates due to cancer, heart disease, and cerebrovascular diseases. What additional information would be useful to specify better the changes in these conditions? c) Note the decline in mortality for the four communicable diseases (1, 2, 3, and 10) since 1900. With the exception of pneumonia and influenza, these are no longer among the 10 leading causes of death. Can you speculate regarding how much of each is due to environmental improvements and how much to specific preventive and curative practices? d) Among the 10 leading causes of death in 2015 were chronic lower respiratory diseases (48.2 per 100,000—rank 3), Alzheimer's disease (34.4 per 100,000—rank 6), diabetes (24.7 per 100,000—rank 7), and suicide (13.7 per 100,000—rank 10). (Note: Data are not shown in Table 2A-1.) In 1900, these were not among the 10 leading causes of death. How do you account for these changes? The following questions refer to TABLE 2-A1. TABLE 2-A1 Leading Causes of Death and Rates for Those Causes in 1900 and 2015. United States Rate per 100,000 Population Rank 1900 Cause of Deatha 1900 2015 All causes 1,719.1 844.0 Influenza and pneumonia, except pneumonia of newborn 202.2 17.8 2 Tuberculosis, all forms 194.4 NAb 3 Diarrhea and enteritis 139.9 NA 4 Disease of heart 137.4 197.2 5 Cerebrovascular diseases 106.9 43.7 6 Chronic nephritis 81.0 15.5 7 Accidents and adverse effects 72.3 45.6 8 Malignant neoplasms 64.0 185.4 9 Senility 50.2 NA 10 Diphtheria 40.3 NA Some categories may not be strictly comparable because of change in classification NA These are no longer listed among the top 10 causes of death. Crude death rate Accidents (unintentional injuries)
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Question Text
 Assertion: Stomata are absent in submerged hydrophytes.
Reason: Respiration occurs by means of air chambers in submerged plants.
TopicAnatomy of Flowering Plants
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes53