Answer: Option A. -> Golgi apparatus
:
A
The Golgi apparatus is responsible for the packaging, modification and transport of proteins. Proteins formed in the rough endoplasmic reticulum are packaged into vesicles and are transported to the golgi apparatus. Once the proteins reach the golgi, they are modified and transported to their respective locations through vesicles. Hence golgi apparatus is known as the post office of the cell.

Answer: Option B. -> False
:
B

Extrachromosomal DNA is found outside the nucleus of a cell. It is also referred to as an extra nuclear DNA or cytoplasmic DNA. The nuclear DNA which is also known as genomic DNA is responsible for almost all cellular functions. However, extrachromosomal DNA also serves important biological functions. Chloroplasts and mitochondria are cell organelles with extrachromosomal DNA.

Answer: Option B. -> False
:

A tissue is a group of similar cells specialised to perform a specific function. The cells that make up a tissue are similar in structure, function and origin. For example- epithelial tissue, nervous tissue, muscular tissue, etc.

Answer: Option A. -> Chlorophyll
:
A

Plants appear green due to the presence of a pigment called chlorophyll. There are high concentrations of chlorohyll in chloroplasts. These plastids are responsible for photosynthesis.

Answer: Option A. -> The nucleolus is found inside the nucleus.
:
A, B, and C

The nucleolus is present inside the nucleus and is the site where ribosomes are synthesised. The nucleus contains DNA (heredity material) and coordinates all workings of the cell. Other than the nucleus, mitochondria and chloroplasts are the only two organelles which contain their own genetic material. Lactobacillus is a strain of bacteria present in milk. All bacteria are prokaryotic in nature.

Answer: Option B. -> False
:
B
Cells show great diversity in their shapes and sizes. The size and shape of a cell are related to its function. Some multicellu­lar organisms may have smaller sized cells as compared to many unicellular organisms. Some single cells like the eggs of birds and reptiles are quite large. A nerve cell may attain a length of several meters while red blood cells are only 5-8µm in diameter. Also, within an organism, the cells rarely remain in the spherical form. They are either flat­tened (epithelial cells), spindle-shaped (muscle cells), spider-shaped (nerve cell), etc.

Answer: Option B. -> Anton van Leeuwenhoek
:
B

The microscope was discovered by a Dutch scientist Anton van Leeuwenhoek. He was the first person to observe living cells under the microscope. Hence, he is considered as the 'Father of Microbiology'. 

Answer: Option C. -> Staining
:
C
Cell staining is the technique of colouring different cellular organelles. It is used to visualise cells and cellular components better under a microscope. By using different stains, one can preferentially stain specific cell components, such as a nucleus, cell wall, or the entire cell.

Answer: Option A. -> Prokaryotes do not have a definite nucleus.
:
A and B
Prokaryotic cells are considered as primitive. They do not have a well defined nucleus and also lack membrane-bound organelles. Eukaryotic cells on the other hand, have a well-defined nucleus. All the membrane-bound cell organelles like mitochondria, golgi apparatus, etc are also present. Prokaryotic cells are smaller than eukaryotic cells. Cytoplasm is a structural component of a cell. It is present in all the cells.

Answer: Option D. -> Microscope
:
D

A microscope is an optical instrument used to observe objects that are invisible to the naked eye. It is used to view and study cell structure. The science of viewing small objects using a microscope is called microscopy.