Class 8 Science Chapter 8 MCQ

Chloroplasts are found only in those plant cells which carry out photosynthesis like the cells in green leaves. So, chloroplasts are not found in the root cells of a plant

The correct combination of terms with reference to an animal cell is cell membrane, mitochondria, ribosome and chromosome. An animal cell does not have a cell wall, plastic and chloroplast, but these are present in plant cells.

Chromosome and genes are related to inheritance of characters. Chromosomes are present in nucleus. They contain genes, which are unit of inheritance.

The pigment chlorophyll present in the chloroplasts, which is responsible for green colour of leaves. It can absorb solar energy for photosynthesis.

An amoeba cell and white blood cell present in human blood can change their shape

Organisms which do not have true nucleus are called prokaryotes. Bacteria and blue green algae are examples of prokaryotes.

The cell membrane controls the entry (movement into the cell) and exit (movement out of the cell) of materials. It also protects and gives shape to the cell.

Cell membrane is the common part of every cell. It encloses the protoplasm, protects the cell, gives the cell its shape and control the entry and exit of substances.

The cell observed by Paheli is a bacterial cell. It is a prokaryotic cell that has a cell wall (like plants) but no distinct nucleus. A plant cell has a cell wall and a well-defined nucleus, whereas in an animal cell, the former is not present. A nerve cell is an animal cell that is long and branched to function as transmitter between brain and other parts.

The cells having well defined nucleus containing nuclear material, enclosed by a nuclear membrane are called eukaryotic cells. Example cheek cells. Blue green algae are prokaryotic cells that do not have a nuclear membrane.