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Amazon rain forests are considered as lungs of the planet as t
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Amazon rain forests are considered as lungs of the planet as they contribute ______ of the total oxygen in the earth's atmosphere.

A
10%

B
15%

C
20%

D
30%

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Views: 5,194 students

Book

Book:

Dr. Ali Objective Biology

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Amazon rainforest produces about 20% of the world's oxygen. They are called as the lungs of the planet since they give the essential world environmental service of continously recycling carbon dioxide into oxygen.
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Practice questions from Dr. Ali Objective Biology

Question 1
Easy
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Views: 5,800

A. More than 70 percent of all the species recorded are animals.
B. Out of every 10 animals on this planet, 7 are insects.
C. The number of fungi species in the world is more than the combined total of the species of fishes, amphibians, reptiles and mammals.
D. Number of fishes is very less than that of mammals.
  1. All correct
  2. All incorrect
  3. A, B and C are correct
  4. Only D is correct
Topic

Topic:

Biodiversity and Conservation

Book

Book:

Dr. Ali Objective Biology

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Question 2
Easy
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Views: 5,205

Fill up the blanks-
Initially ___A ___ biodiversity hotspots were identified but subsequently nine more have been added to the list, bringing the total number of biodiversity hotspots in the world to ___B__ These hotspots are also regions of accelerated habitat loss. Three of these hotspots -Western Ghats and Sri Lanka, Indo-Burma and Himalaya- cover our country's exceptionally high biodiversity regions. Although all the biodiversity hotspots put together cover less than ___ C ___ % of the earth's land area, the number of species they collectively harbour is extremely high andstrict protection of these hotspots could reduce the ongoing mass extinctions by almost __D__ %.
  1. A-25,B-34,C-2,D-30
  2. A-25, B-26,C-2,D-30
  3. A-25,6-34, C-10, D – 30
  4. A-15, B-20, C-2, D – 30
Topic

Topic:

Biodiversity and Conservation

Book

Book:

Dr. Ali Objective Biology

View solution

Question 3
Easy
Views

Views: 6,089

Anthroprogenic extinction is called
  1. Fifth mass extinction
  2. Fourth mass extinction
  3. Sixth mass extinction
  4. Seventh mass extinction
Topic

Topic:

Biodiversity and Conservation

Book

Book:

Dr. Ali Objective Biology

View solution

Question 4
Easy
Views

Views: 5,925

As estimated by Robert May, what is the total number of species present on earth?
  1. 3 million
  2. 5 million
  3. 7 million
  4. 9 million
Topic

Topic:

Biodiversity and Conservation

Book

Book:

Dr. Ali Objective Biology

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Practice more questions from Biodiversity and Conservation

Question 1
Hard
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Views: 5,640

The table below gives the populations (in thousands) of ten species (A = J) in four areas (I – IV) consisting of the number of habitats given within brackets against each area. Study the table and answer the question. Which area out of I to IV shows maximum species diversity?
  1. I
  2. II
  3. III
  4. IV
Topic

Topic:

Biodiversity and Conservation

Book

Book:

Xtract Objective Biology for NEET (Disha)

View 2 solutions

Question 2
Medium
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Views: 5,621

In the following question, a statement of Assertion is followed by a statement of Reason.
Assertion: Diversity observed in the entire geographical area is called gamma diversity.
Reason : Biodiversity decreases from high altitude to low altitude.
  1. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  2. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
  3. If Assertion is true but Reason is false.
  4. If both Assertion and Reason are false.
Topic

Topic:

Biodiversity and Conservation

Book

Book:

Xtract Objective Biology for NEET (Disha)

View solution

Question 3
Easy
Views

Views: 6,250

Which of the following is not a cause for loss of biodiversity?
  1. Destruction of habitat
  2. Invasion by alien species
  3. Keeping animals in zoological parks
  4. Over-exploitation of natural resources
Topic

Topic:

Biodiversity and Conservation

Book

Book:

Biology Exemplar (NCERT Exemplar)

View 2 solutions

Question 4
Easy
Views

Views: 5,788

Define the following:
Biodiversity
Topic

Topic:

Biodiversity and Conservation

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Practice questions on similar concepts asked by Filo students

Question 1
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Question 47 30 pts Select either #47, or #48. DO NOT ANSWER MORE THAN ONE, This section is worth 30 points. Describe the general properties of each of the four major classes of organic molecules. including the major roles of each of them in cells Edit View Insert Format Tools Table 12pt Paragraph 2y
Topic

Topic:

Biology

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Question 2
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SOAP Note Chapter 7 Brighton College Health Center 4/16/15 Julie Kingsman, PA Patient: Andre Byron SUBJECTIVE Feeling "under the weather" for a week Denies body aches, chills Reports sore throat OBJECTIVE 18-year-old male Pulse oximeter saturation 93% on room air, temperature 98.9°F Rhinorrhea and sinusitis noted on assessment Laryngitis noted, with associated dysphonia Pharyngitis noted, per patient complaint Productive cough with expectoration of yellow-green sputum ASSESSMENT Upper respiratory infection PLAN Recommend rest and increased fluid intake Prescribe antitussive Chest x-ray to rule out community-acquired pneumonia if not better in 2 weeks Questions Which objective sign means a sore throat? What is an antitussive? Provide the word parts. What causes an upper respiratory infection?
Topic

Topic:

Biology

View solution

Question 3
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9:07 जीवों में जनन प्रश्न 1. जीवों के लिए जनन क्यों अनिवार्य है ? उत्तर-जीवों में जनन, प्रजाति में एक पीढ़ी से दूसरे पीढ़ी में निरन्तरता बनाए रखने के लिए आवश्यक है। एक जीव से दूसरे जीव (संतति) का जन्म होता है। यह छोटा जीव समय के साथ बढ़ता है और फिर वह नयी संतति को जन्म देता है। इस प्रकार जन्म, वृद्धि तथा मृत्यु का चक्र चलता रहता है। प्रश्न 2. जनन की अच्छी विधि कोन-सी है और क्यों ? उत्तर-जनन की अच्छी विधि लिंगीय जनन है, क्योंकि जीवों में आनुवंशिक विविधता आती है जो प्रतिकूल परिस्थितियों में विकास और जाति की उत्तरजीविता के लिए जरूरी है। प्रश्न 3. अलैंगिक जनन द्वारा उत्पन्न हुई संतति को क्लोन क्यों कहा गया है? उत्तर-अलैंगिक जनन द्वारा उत्पन्न हुई संतति केवल एक-दूसरे के समरूप ही नहीं होती, बल्कि अपने जनक के बिल्कुल समान होती है। आकारिकीय तथा आनुवंशिक रूप से जनक के एक समान होती है। इसलिए अलैंगिक जनन द्वारा उत्पन्न सन्तानें क्लोन कहलाती हैं। प्रश्न 4. लैंगिक जनन के परिणामस्वरूप बने संतति को जीवित रहने के अच्छे अवसर होते हैं। क्यों ? क्या यह कथन हर समय सही होता है ? उत्तर-लैंगिक जनन में दो विपरीत लिंग नर व मादा युग्मक आपस में मिलकर युग्मनज को बनाते हैं जिससे नये जीव उत्पन्न होते हैं। इन्हें आनुवंशिक पदार्थ दो जनकों से प्राप्त होता है और इनमें विविधता पायी जाती है। अतः हम यह कह सकते हैं कि लैंगिक जनन के परिणामस्वरूप बने संतति को जीवित रहने के अच्छे अवसर होते हैं, लेकिन यह कथन सदैव सत्य नहीं होता है। कुछ परिस्थितियों में जीवों के लिए अलैंगिक जनन बेहतर होता है। अलैंगिक जनन में लैंगिक जनन की अपेक्षा प्रजनन की दर बहुत तीव्र होती है। प्रश्न 5. अलैंगिक जनन द्वारा बनी संतति लैंगिक जनन द्वारा बनी संतति से किस प्रकार से भिन्न है ? उत्तर-अलैंगिक जनन द्वारा बनी संतति का जनक एक ही होता है। संतति के बनने के लिए युग्मक नहीं बनते हैं। एक जनक के सभी सन्तति जीवों के लक्षण मांतृ जीव के एकदम समान होते हैं। आकारिकीय तथा आनुवंशिक रूप से भी जनक तथा सन्तति एक समान होते हैं। इसलिए इन संतति को क्लोन कहते हैं। लैंगिक जनन में दो विपरीत लिंग के नर व मादा युग्मक का संलयन होता है। युग्मकों के आपस में मिलने से जाइगोट का निर्माण होता है, जिससे बाद में संतति का निर्माण होता है। नर तथा मादा युग्मक के युग्मन से जो संतति बनती है वह अपने जनकों के समान नहीं होती है। प्रश्न 6. अलैंगिक तथा लैंगिक जनन के मध्य विभेद स्थापित कीजिए। कायिक जनन को प्रारूपिक अलैंगिक जनन क्यों माना गया है ?
Topic

Topic:

Biology in Human Welfare

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Question 4
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Views: 5,090

Enzymes secreted by the stomach enter the small intestine. What happens to them and why?
Topic

Topic:

Biology

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Question Text
Amazon rain forests are considered as lungs of the planet as they contribute ______ of the total oxygen in the earth's atmosphere.
TopicBiodiversity and Conservation
SubjectBiology
ClassClass 12
Answer TypeText solution:1
Upvotes110