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Answer:
Q. 1 Mitochondria
Q. 2 Cardiac muscles
Q. 3 Nucleoid
Q. 4 A is false and R is true
Q. 5 Both A and R are true and R is the correct explanation of A
Q. 6 Cell having higher water concentration than surrounding medium, loses water by the process of exosmosis in hypertonic solution. In case it's an animal cell, the cell shrinks due to excess water loss from high concentration to low concentration through a semi permeable membrane. While in case of plant cells, the cell wall prevents the plasmolysis of the cell.
Q. 7 Functions of blood
i) It helps in transportation of oxygen and organic food molecules throughout the body to various parts.
ii) It is a fluid connective tissues which has plasma matrix to hold and maintain the flow of the content cells of the blood vessels in a closed circulatory system.
iii) It has 3 kinds of cells:
• RBCs or Erythrocytes which are red in colour and help in transportation of oxygen with the help of haemoglobin.
• WBCs or Leucocytes which are colourless cells prevent the invasion of foreign microorganisms in the blood stream thus serve the purpose of protection.
• Platelets or Thrombocytes help in the clot formation around wounds whenever an individual gets hurt, in order to prevent death by excess loss of blood from body.
Q. 8 Parenchyma tissue is different from schlerenchyma tissue in many ways:
i) Parenchyma is living and schlerenchyma is non living tissue.
ii) Parenchyma serves the function of storage while schlerenchyma serves the purpose of providing strength and mechanical support to plant.
iii) Parenchyma has thin cell wall with prominent nucleus while schlerenchyma has thick lignified cell walls.
Q. 9 i) Diagram of nucleus
ii) Nucleus provides with ribosomes that help in protein formation. It contains chromosomes that have the hereditary characteristics called genes which have the information called DNA used for transmission of important information like cell division and cell administration from mother cell to daughter cell.
iii) If the nucleus is well-defined which means if the nucleus is bound by a nuclear membrane and it's contents seperated from cytoplasm , then the cell is eukaryotic. Whereas, if the cell has a poorly-defined nucleus which means nuclear contents are entangled mass structure floating in the cytoplasm without any enclosure of nuclear membrane, which is know as nucleoid, defines the identity of prokaryotic cell.