Biology in Class 9 Science : Practice MCQ Questions & Answers with Explanations

The plasma membrane controls the movement of substances into and out of the cell.

Plants use sunlight to perform photosynthesis.

The heart pumps blood throughout the body.

Sclerenchyma consists of dead cells with thick lignified walls that provide support.

Xylem is a complex permanent tissue made up of different types of cells.

Meristematic tissues contain actively dividing cells responsible for plant growth.

The Golgi apparatus modifies, packages, and transports proteins and lipids.

Centrioles are present in animal cells and help in cell division.

Chromatin consists of DNA wrapped around proteins called histones.

Plant cell walls are mainly composed of cellulose, which provides support and protection.

The plasma membrane is semi-permeable and regulates the movement of substances into and out of the cell.

Mitochondria produce ATP, which supplies energy for cellular activities.

Chloroplasts contain chlorophyll and carry out photosynthesis in plants.

Prokaryotic cells are generally very small and range from 0.1 to 5 micrometers in size.

The nucleus contains genetic material and controls cellular activities.

Bacteria are prokaryotes because they lack a true nucleus and membrane-bound organelles.

Hydra is a multicellular organism, whereas Amoeba, Paramecium, and Euglena are unicellular organisms.

The cell is the fundamental unit of life and performs all essential functions such as growth, metabolism, and reproduction.