Environment

Q. Lysosomes are membrane-bound sacs filled with ___.

1. digestive enzymes
2. lipids
3. protiens
4. DNA

Q.

Current concentration of $C{O}_2$ in atmosphere is:

1. 270 ppmv

2. 350 ppmv

3. 500 ppmv

4. 430 ppmv

Q. Select the correct option regarding the given features of life forms.

A. Growth
B. Consciousness
C. Reproduction

सजीवों के दिए गए गुणों के संदर्भ में सही विकल्प का चयन कीजिए।

A. वृद्धि
B. चेतना
C. जनन

1. A and B are defining features as these are seen only in living organisms
   
   A तथा B परिभाषिकारी गुण हैं क्योंकि ये केवल सजीवों में देखे जाते हैं
   
2. B and C are defining features as these are not shown by non-living objects
   
   B तथा C परिभाषिकारी गुण हैं क्योंकि ये निर्जीव पदार्थों द्वारा नहीं दर्शाए जाते हैं
3. B is defining feature as every organism has consciousness
   
   B परिभाषिकारी गुण है क्योंकि प्रत्येक जीव में चेतना होती है
4. Both A and C show some exceptions in living organisms
   
   A तथा C दोनों, सजीवों में कुछ अपवादों को दर्शाते हैं

Q. Which of the following is not a step in the process of breakdown of food by lysosomes?

1. Exocytosis
2. Digestion of worn-out organelles
3. Formation of phagosome
4. Endocytosis

Q. The gradual physiological adjustment to slowly changing new environmental conditions is known as _____.

1. Selection
2. Introduction
3. Acclimatization
4. Quarantine

Q. Farming is very extractive in nature. Which of the following helped human beings overcome this?

1. Metal tools
2. Leguminous plant
3. All of the above
4. Adding manure

Q. If there was no $C{O}_2$ in the atmosphere, the earth's temperature would be

1. less than the present temperature
2. same as the present temperature
3. dependent on $O_2$ content of air.
4. higher than the present temperature

Q. Which of the following is not a step in the process of breakdown of food by lysosomes?

1. Exocytosis
2. Digestion of worn-out organelles
3. Formation of phagosome
4. Endocytosis

Q. Lysosomes are membrane-bound sacs filled with ___.

1. digestive enzymes
2. lipids
3. protiens
4. DNA

Q. What does the poet want to do after going to the Lake Isle of Innisfree?

Q. Melting of the ice caps might result from

1. Depletion of ozone layer
2. Excess CFC in atmosphere
3. Excess $C{O}_2$ in the atmosphere
4. Both B and C