The Fundamental unit of Life

Which of the following is/are true for cells?
1. Cells were first discovered by Robert Hooke in 1655.
2. Robert obserbed the cells in a cork slice with the help of a primitive microscope.
3. Leeuwenhoek (1674), with the improved microscope, discovered the free living
cells in pond water for the first time.

What is/are true for the cell theory?
1. The cell theory states that all the plants and animals are composed of cells and
that the cell is the basic unit of life.
2. All cells arise from pre-existing cells.

What is/are true for organisms?
1. Amoeba, Chlamydomonas, Paramoecium and bacteria are called unicellular
organisms.
2. Fungi, plants and animals are multicellular organisms.

Which of the following is/are true for cells?
1. Each cell has got certain specific components within it known as cell organelles.
2. All cells are found to have different organelles.

Which of the following is/are true for plasma membrane?
1. It is the outermost covering of the cell.
2. It allows or permits the entry and exit of some materials in and out of the cell.
3. The plasma membrane is flexible and is made up of organic molecules called
minerals and proteins.

Which of the following is/are correctly matched?
1. Hypotonic solution ——————— water concentration is more in surrounding.
2. Isotonic solution ———————————————— no movement of water.
3. Hypertonic solution ——————— lower concentration of water than the cell.

Which of the following is/are true for the cell wall?
1. It is present in animals and plants.
2. The cell wall lies outside the plasma membrane.
3. The plant cell wall is mainly composed of cellulose.

Which of the following is/are true for nucleus?
1. The nucleus has a double layered covering called nuclear membrane.
2. The nucleus contains chromosomes, which are visible as rod-shaped structures.

Which of the following is/are true for prokaryotes?
1. The cell of the organisms lack a nuclear membrane.
2. All the cytoplasmic organelles are present.

Which of the following is/are true for cytoplasm?
1. The cytoplasm is the fluid content inside the plasma membrane.
2. Prokaryotic cells lack cell organelles.

Which of the following is/are correctly matched?
1. Rough Endoplasmic Recticulum ——————— ribosomes attached to surface.
2. SER ——————————————————————— manufacture of fats.
3. Golgi Apparatus ————————————————– waste disposal system.

Which of the following is/are true for mitochondria?
1. Mitochondria are known as the powerhouses of the cell.
2. The energy required for various chemical activities needed for lifes released by
mitochondria in the form of ATP (Adenosine triphopshate) molecules.

Which of the following is/are true for plastids?
1. Plastids present in plant cells.
2. Two types are – chromoplasts and leucoplasts.
3. Starch and proteins are stored in chromoplast.

Which of the following is/are true for vacuoles?
1. Vacuoles are storage sacs for solid or liquid contents.
2. Vacuoles are small sized in plant cells.
3. In plant cells vacuoles are full of cell sap and provide turgidity and rigidity to the
cell.