Cell: The Unit of Life

Correct Answer: B

1. Our surroundings contain many objects.<br>2. Some show characteristics of life.<br>3. These are called living things.<br>4. Others do not show life processes.<br>5. These are non-living things.<br>6. Living things grow and reproduce.<br>7. Non-living things do not.<br>8. This is a basic classification.<br>9. It helps in understanding biology.<br>10. Thus, we see living and non-living things.

Correct Answer: B

1. Living and non-living things are different.<br>2. Living organisms show life processes.<br>3. These include growth, reproduction and metabolism.<br>4. The basic unit responsible for life is the cell.<br>5. All living organisms are made of cells.<br>6. Cells perform all life activities.<br>7. Non-living things lack cells.<br>8. Hence, they do not show life processes.<br>9. This is the key difference.<br>10. Thus, presence of cells makes organisms living.

Correct Answer: B

1. Cells are the basic units of life.<br>2. Every living organism is made of cells.<br>3. Some organisms have one cell.<br>4. Others have many cells.<br>5. Cells perform all life processes.<br>6. They form tissues and organs.<br>7. This is a part of cell theory.<br>8. It applies to all living beings.<br>9. It is a fundamental concept.<br>10. Thus, all organisms are composed of cells.

Correct Answer: B

1. Organisms are classified based on number of cells.<br>2. Some have only one cell.<br>3. These are called unicellular organisms.<br>4. Example: bacteria.<br>5. Some organisms have many cells.<br>6. These are called multicellular organisms.<br>7. Example: humans.<br>8. Multicellular organisms show specialization.<br>9. Cells form tissues and organs.<br>10. Thus, organisms are unicellular or multicellular.

Correct Answer: B

1. Unicellular organisms have only one cell.<br>2. This single cell performs all functions.<br>3. They can live independently.<br>4. They do not need other cells.<br>5. They carry out life processes.<br>6. These include metabolism and reproduction.<br>7. They maintain themselves.<br>8. They respond to environment.<br>9. They are self-sufficient.<br>10. Thus, they show independent existence and perform essential functions.

Correct Answer: B

1. A cell is the basic unit of life.<br>2. It performs all essential functions.<br>3. A complete cell is required for survival.<br>4. Parts of a cell cannot live independently.<br>5. They depend on the whole cell.<br>6. Only a complete cell can function properly.<br>7. This ensures life processes.<br>8. Without full structure, life cannot continue.<br>9. Hence, independence is lost.<br>10. Thus, only complete cells ensure independent living.

Correct Answer: B

1. Cells are the smallest units of life.<br>2. All organisms are made of cells.<br>3. Cells provide structure to organisms.<br>4. They also perform all life functions.<br>5. No smaller unit can perform all functions.<br>6. Cells carry out metabolism and growth.<br>7. They ensure survival of organisms.<br>8. This makes them fundamental units.<br>9. They are both structural and functional.<br>10. Thus, cell is the fundamental structural and functional unit.

Correct Answer: B

1. Cells are the smallest units of life.<br>2. All organisms are made of cells.<br>3. Cells provide structure to organisms.<br>4. They also perform all life functions.<br>5. No smaller unit can perform all functions.<br>6. Cells carry out metabolism and growth.<br>7. They ensure survival of organisms.<br>8. This makes them fundamental units.<br>9. They are both structural and functional.<br>10. Thus, cell is the fundamental structural and functional unit.

Correct Answer: B

1. The nucleus is an important cell organelle.<br>2. It was discovered in the 19th century.<br>3. Robert Brown identified the nucleus.<br>4. This discovery was made in 1831.<br>5. It was first seen in plant cells.<br>6. The nucleus controls cell activities.<br>7. It contains genetic material.<br>8. This discovery was important in biology.<br>9. It helped in understanding cells.<br>10. Thus, Robert Brown discovered the nucleus.

Correct Answer: B

1. Cells are very small and cannot be seen with naked eye.<br>2. The microscope was invented to observe them.<br>3. It helped scientists study cell structure.<br>4. Later, electron microscope was developed.<br>5. It provides higher magnification.<br>6. It shows detailed internal structures.<br>7. Organelles can be clearly seen.<br>8. This improved understanding of cells.<br>9. It was a major advancement.<br>10. Thus, microscope revealed cell details.