(i) Which cell organelle is responsible for the release of energy in the form of
ATP?
(ii) What is the significance of cell membrane?
(iii) Why are mitochondria known as the ‘powerhouse’ of the cell?
(iv) What will happen to a cell if its nucleus is removed?
(v) Is this statement true or false: Plant cells have chloroplasts, but no mitochondria?
Justify your answer.
(vi) Mention three features found only in plant cells and one found only in animal
cells.
(vii) Name three kinds of permanent tissues found in plants. Write one function of
each.
(viii) What is a protective tissue? Why is epidermis considered as a protective
tissue?
(ix) What is stem cell technology? Give its two uses in disease control.
Answers
Answer:
1.Mitochondria
2.The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell. And that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.
3.Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
4.The nucleus is known as the control centre of the cell and carries the genetic material. It is the brain of the cell and controls most of its functions. If the nucleus is removed from the cell then the cell will not be able to function properly, it will not be able to grow. ... Gradually, the cell may die.
5.False. Explanation: The chloroplast organelles are associated with the process of photosynthesis but the mitochondria are associated with the process of cellular respiration. The plant cells possess both of these organelles that is chloroplast and the mitochondria as the photosynthesis process provides the glucose.
6.Special Structures in Plant Cells
Most organelles are common to both animal and plant cells. However, plant cells also have features that animal cells do not have: a cell wall, a large central vacuole, and plastids such as chloroplasts.
7.The three kinds of permanent tissues found in plants are: Xylem: One of the main functions of Xylem is to provide mechanical support to the plants and conduction of water. Phloem: One of the core functions of Phloem is storing foods materials and their translocation to the storage organs from the leaves
8.The epidermis is considered a protective tissue because its prime purpose is to form a physical barrier between the outside and inside of the body. On the top stratum (layer) of the epidermis, the cells are dead, and so have no physiological function besides to form a barricade against the outside.
9.Stem cell therapy, also known as regenerative medicine, promotes the repair response of diseased, dysfunctional or injured tissue using stem cells or their derivatives. It is the next chapter in organ transplantation and uses cells instead of donor organs, which are limited in supply.
Explanation:
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1.Mitochondria
2.The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell. And that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.
3.Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
4.The nucleus is known as the control centre of the cell and carries the genetic material. It is the brain of the cell and controls most of its functions. If the nucleus is removed from the cell then the cell will not be able to function properly, it will not be able to grow. ... Gradually, the cell may die.
5.False. Explanation: The chloroplast organelles are associated with the process of photosynthesis but the mitochondria are associated with the process of cellular respiration. The plant cells possess both of these organelles that is chloroplast and the mitochondria as the photosynthesis process provides the glucose.
6.Special Structures in Plant Cells
Most organelles are common to both animal and plant cells. However, plant cells also have features that animal cells do not have: a cell wall, a large central vacuole, and plastids such as chloroplasts.
7.The three kinds of permanent tissues found in plants are: Xylem: One of the main functions of Xylem is to provide mechanical support to the plants and conduction of water. Phloem: One of the core functions of Phloem is storing foods materials and their translocation to the storage organs from the leaves
8.The epidermis is considered a protective tissue because its prime purpose is to form a physical barrier between the outside and inside of the body. On the top stratum (layer) of the epidermis, the cells are dead, and so have no physiological function besides to form a barricade against the outside.
9.Stem cell therapy, also known as regenerative medicine, promotes the repair response of diseased, dysfunctional or injured tissue using stem cells or their derivatives. It is the next chapter in organ transplantation and uses cells instead of donor organs, which are limited in supply.