CBSE Questions for Class 9 Biology The Fundamental Unit Of Life Quiz 3 - MCQExams.com

$$\textbf{Correct option: }$$ C

$$\textbf{Solution: }$$ 

$$\textbf{Option (A) }$$

$$\bullet$$Chloroplast contains thylakoids and grana whereas the leucoplast are devoid of thylakoids structure. 

$$\textbf{Option (B) }$$

$$\bullet$$Each lysosome is a small vesicle surrounded by a single membrane containing hydrolytic enzymes which are capable of digesting or breaking down all organic materials.

$$\bullet$$Lysosomes are also known as suicide bags of a cell as this organelle can burst and the lytic enzyme can spill all over the cell, rupturing the cell membrane or cell wall, resulting in the death of the cell.  

$$\textbf{Option (C) }$$

$$\bullet$$Vacuoles are the kind of storage sacs that can maintain the osmotic pressure in a cell and store toxic metabolic by-products or end products of plant cells. 

$$\textbf{Option (D) }$$

$$\bullet$$Both the nucleus and the cytoplasm of the cell forms the protoplasm of the cell. 

Hence, the correct option is (C)

Lysosomes are the smallest vesicle-like cell organelles, surrounded by a single membrane. It consists hydrolytic enzymes which break down the foreign particles, dead cellular content, etc. The lysosomal membrane allows the digestive enzymes to work at lower pH.

So, the correct answer is option A.

• The nucleus is the membrane-bound important structure of the eukaryotic cell.
• The nucleus regulates all cellular activities by controlling the enzymes required for cellular processes. 
• It contains genetic information in the form of genes located in the chromosomes.
• It brings about the growth of the cell by directing the synthesis of structural proteins. It also controls all the metabolic activities of the cell.
  So, the correct answer is option D.

Solution

Correct answer is option C

Explanation for correct option:

• The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not.
• The prokaryotic ribosomes are small, 70 S ribosomes whereas the eukaryotic ribosomes are larger, 80S ribosomes.

• A nuclear membrane, also known as the nuclear envelope, is a double lipid bilayer membrane, which surrounds the nucleus containing genetic material and nucleolus in eukaryotic cells. 
• The nuclear membrane consists of two lipid bilayers- the inner nuclear membrane and the outer nuclear membrane and consists of pores called nuclear pores for the transportation of DNA, RNA, and proteins.