Answer the following questions
What are unicellular and multicelororgani?
2. What are the different levels of organization in a multicellular organism
3. Write short notes on
(a) Mitochondria
(b) Cytoplasm
(c) Nucleus
4. What are plastids and how are they classified?
5. Why are chloroplasts found only in the plant cells
Write four difference between plant and animal cell.
7. What are the functions of xylem and phloem.
Answers
Explanation:
The structure of the unicellular is made up of a single cell. The structure of the multicellular organisms is made up of numerous cells. ... Amoeba, paramecium, yeast all are examples of unicellular organisms. Few examples of multicellular organisms are human beings, plants, animals, birds, and insects.
2.An organism is made up of four levels of organization: cells, tissues, organs, and organ systems.
What are unicellular and multicellular organisms?
Ans:Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions.
2. What are the different levels of organization in a multicellular organism?
Ans: Multicellular organisms are made from cells, tissues, organs, and organ systems. Remember that multicellular means made of two or more cells. The organism is the highest level of organization.
3. Write short notes on
3. Write short notes on(a) Mitochondria
3. Write short notes on(a) Mitochondria(b) Cytoplasm
3. Write short notes on(a) Mitochondria(b) Cytoplasm(c) Nucleus
(a) Ans: Mitochondria are known as the powerhouses of the cell. They are organelles that act like a digestive system which takes in nutrients, breaks them down, and creates energy rich molecules for the cell. The biochemical processes of the cell are known as cellular respiration.
(b) Ans: The cytoplasm is the semi-viscous ground substance of the cell. All the volume of such substance outside the nucleus and inside the plasma membrane is cytoplasm. It is sometimes described as the non-nuclear content of the protoplasm. All the cellular contents in prokaryotes are contained within the cell's cytoplasm.
(c) Ans: The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.
4. What are plastids and how are they classified?
Ans : The plastid (Greek: πλαστός; plastós: formed, molded – plural plastids) is a membrane-bound organelle found in the cells of plants, algae, and some other eukaryotic organisms. ... Plastids are the site of manufacture and storage of important chemical compounds used by the cells of autotrophic eukaryotes.
The plastids are broadly classified into two main types namely chromoplasts and leucoplasts. ... Chromoplasts are found commonly in flowers and fruits. Chromoplasts also divided into three types based on their color namely chloroplast, phaeoplast and rhodoplast. Chloroplast: It is in green color.
5. Why are chloroplasts found only in the plant cells?
Ans : Chloroplasts are organelles found in plant cells and eukaryotic algae that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant. In this respect they are similar to mitochondria, but are found only in plants and protista.
Both animal and plant cells have mitochondria, but only plant cells have chloroplasts. Plants don't get their sugar from eating food, so they need to make sugar from sunlight.Because animals get sugar from the food they eat, they do not need chloroplasts: just mitochondria.
Write four difference between plant and animal cell.
Cells are the basic unit of a living organism and where all life processes are carried out. Animal cells and plant cells share the common components of a nucleus, cytoplasm, mitochondria and a cell membrane. Plant cells have three extra components, a vacuole, chloroplast and a cell wall.
7. What are the functions of xylem and phloem.
Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants.
Explanation: