Question

important points from cells and structures class 8. please mention the points frm text.....
important for exam preparation
no spam pls​

Answer 1

Plant Cell Animal Cell

2. Plant cells contain. 2. Absent in animal

chloroplasts which are. cell

used.

for photosynthesis

3. Plant cells have a. Animal cells have a b small vacuole, u compared to a plant cell.

large vacuole

(it's like a fluid sack),

compared to an animal cell.

Answer 2

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➦ Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function.

• Cells are the basic structures of all living organisms.
• Cells provide structure for the body, take in nutrients from food and carry out important functions.
• Cells group together to form tissues, which in turn group together to form organs, such as the heart and brain.
• Our cells contain a number of functional structures called organelles.
• These organelles carry out tasks such as making proteins, processing chemicals and generating energy for the cell.
• The nucleus is based at the centre of the cell and is the ‘control room’ for the cell.
• The genome is found within the nucleus

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Cell Factory

Organelles

• The various components present within the cell are known as cell organelles.
• All these components are special and specific to their functions.
• For example, mitochondria, lysosomes etc.

Nucleus

• It is generally spherical and located in the centre of the cell.
• The nucleus is separated from the cytoplasm by a membrane called the nuclear membrane.
• It uses information in the chromosomes to decide what each organelle should do and the functions of the cell.
• The nucleus contains an even smaller concentrated material called nucleolus.

Chromosomes

• The nucleus contains thread-like structures called chromosomes.
• These carry genes and help in inheritance or transfer of characters from the parents to the offspring.
• Chromosomes are composed of DNA in the form of Chromatin and protein.
• Chromosomes contain information for the inheritance of features from parents to next generation in the form of DNA molecules.

DNA

• DNA molecules contain the information necessary for constructing and organising cells.
• Functional segments of DNA are called genes.

• Vacuoles, Endoplasmic Reticulum and Golgi Apparatus
• Vacuoles
• Vacuoles are storage bubbles of irregular shapes which are found in cells.
• The vacuole stores the food, a variety of nutrients that a cell might need to survive or waste.
• In plant cells, vacuoles are much larger than in animal cells and they provide rigidity to the plant cells.

Golgi Apparatus

• Golgi Apparatus also termed as Golgi Complex is a membrane-bound nucleus.
• Its main function is to modify proteins.
• These modified proteins are placed in Golgi so that it can transport elsewhere in the cell when required.
• Endoplasmic Reticulum
• It is a membranous organelle.
• It is found in all eukaryotic cells.
• The ER is divided into two types based on their physical and functional properties viz. Smooth and Rough ER.