CBSE Class 9 Science Worksheet Set A

1. __ separates the cell content from the external environment.

2. Water molecules move from __ concentration to ___concentration during osmosis.

3. Chromosomes are formed from __.

4. Rough ER bears ____on its membranes.

5. The protective outer covering in plant cells outside plasma membrane is called ___.

6. Functional segments of DNA are called __.

7.The cells that do not have a well organised nucleus are called _____________.

8.______ is a spherical body present inside the nucleus.

9..The process responsible for movement of carbon dioxide and oxygen across the cell membrane is __.

10. ______are “small organs” of the cell and are found embedded in the cytosol.

11.________ discovered Golgi complex in ___

12.______ apparatus consists of a set of membrane-bounded, fluid-filled vesicles, vacuoles and flattened cisternae.

13.____ is the site of protein synthesis so it is known as protein factory of the cell.

14.Mitochondria have their own ribosomes and ______, they can synthesize their own proteins, and they are self-duplicating units.

15. ______ are dark, spherical, single membrane bound sacs containing several digestive enzymes.

16. When a cell is destined to die, the lysosomal enzymes digest the whole cell. This process is known as ____

17. ______are spherical or discoidal in shape and are enclosed in double membrane.

18. _____ is the homogeneous matrix in which grana are embedded.

19.Chloroplasts are Green-coloured plastids containing ______.

20. The chlorophyll present in Chloroplasts trap solar energy for the purpose of synthesizing food for the ______.

21. ___ are small and spherical organelles containing powerful oxidative enzymes and are specialized for carrying out some oxidative reactions, such as detoxification or removal of toxic substances from the cells

22. The nuclear envelope contains many pores known as nuclear pores and encloses the liquid ground substance, the ______

23. Nucleolus made of ______, RNA and protein.

24. Nucleolus is called as ______ of ribosomes.

25. The ______ is a thin, thread-like intermingled mass of chromosome material and composed of the genetic substance DNA (deoxyribonucleic acid) and proteins

26. Functional segments of ______ are called genes.

27.______are fluid-filled or solid-filled and membrane bound spaces in the cytoplasm.

28. Lysosomes are formed by ______ complex. They are found in the cytoplasm of eukaryotic cell, mostly in animal cells.