Chapter 2 : Cell as a Basic Unit of Life

What is the basic unit of a living thing?

• Cell

• Cell wall

• Nucleus

• Cell membrane

Which of the cells has a fixed shape, the animal cell or the plant cell?

• Animal cell

• Plant cell

• Both have fixed shapes

• None have fixed shapes

Living cells have various shapes. Which of the cells has a fixed shape, the animal cell or the plant cell? Explain.

• Animal cell has a fixed shape due to its structure

• None of the cells have fixed shapes

• Plant cell has a fixed shape due to its structure

• Both animal and plant cells have fixed shapes

Which of the following organisms have chloroplasts that enable them to make their own food?

• Spirogyra, euglena and chlamydomonas

• Amoeba, Mucor and Paramecium

• Hydra and Yis

• Euglena and Paramecium

Name and match the functions of the human cells given.

• All of the above

• Muscle cell - Contracts and relaxes to move the body parts

• Nerve cells - Sends information in the body

• Red blood cell - Transports oxygen

Name various types of plant cells based on their functions.

• Palisade cells - Contain a large amount of chloroplasts for photosynthesis

• Guard cells - Control the size of the stoma (leaf pore)

• Epidermal cells - Reduce water loss and enable gaseous exchange

• All of the above

What are meant by unicellular and multicellular organisms?

• Unicellular organisms consist of more than one cell, while multicellular organisms consist of only one cell

• Unicellular organisms consist of only one cell, while multicellular organisms consist of more than one cell

• Both unicellular and multicellular organisms consist of more than one cell

• Both unicellular and multicellular organisms consist of only one cell

Name the organisms given. Then, write unicellular organism (U) or multicellular organism (M) in the boxes provided.

• Chlamydomonas - U, Hydra - M, Mucor - M, Yis - U

• Paramecium - M, Amoeba - U, Spirogyra - U, Euglena - M

• Chlamydomonas - M, Hydra - U, Mucor - U, Yis - M

• Paramecium - U, Amoeba - M, Spirogyra - M, Euglena - U

Which structure absorbs light for photosynthesis?

• Nucleus

• Vacuole

• Cytoplasm

• Cell membrane

Which of the following are multicellular microorganisms?

• Mucor

• Chlamydomonas

• Spirogyra

• Amoeba