Chapter 16 class 8 Eure ka plus question and answer All question ans plese
Answers
Answer: Make a Sketch of the Human Nerve Cell. What Function Do Nerve Cells Perform?
Ans. The function of the nerve cell is to receive and transmit messages, helping the brain to regulate and coordinate the activity of various parts of the body.
3) Write Short Notes on the Following.
a) Cytoplasm.
Ans. The cytoplasm is a fluid-like substance between the nucleus and the plasma membrane. Various cell organelles such as ribosomes, mitochondria, endoplasmic reticulum, etc. are suspended in the cytoplasm. It helps in the exchange and storage of substances between cell organelles.
b) Nucleus of a Cell.
Ans. The nucleus is the cell master, it controls all cell operations. It is usually located in the centre of the cell and has a circular shape. A membrane called the nuclear membrane separates it from the cytoplasm. It also contains DNA and RNA. This perforated membrane allows for the transfer of substances in the nucleus and cytoplasm. The nucleus contains a dense body called Nucleolus that contains chromosomes.
4) Which Part of the Cell Contains Organelles?
Ans. Cytoplasm, a fluid-like structure located inside the plasma membrane. It is a large part of the cell, which holds all the organelles of the cell such as the nucleus, mitochondria, Ribosomes, Golgi body, ER and all.
7) Where are Chromosomes Found in a Cell? State Their Function.
Ans. Chromosomes are in the form of chromatin found in the nucleus. Chromosome is a gene that stores all kinds of the data which is then passed on from one generation to the next.
8) 'Cells are the Basic Structural Units of Living Organisms.’ Explain.
Ans. Each living thing is made up of cells, plants or animals, bacteria or any other living thing, all made up of different cell types. Organisms that are as simple as viruses, have a single cell type to perform all the functions needed to survive. For complex organisms like human beings the various types of cells come together and form tissues, organs, organ systems and living organisms. Each cell type varies in shape, size and functions.
9) Explain Why Chloroplasts are Found Only in Plant Cells?
Ans. Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll essential for photosynthesis. Chlorophyll captures sunlight and uses it to prepare plant food through the process of photosynthesis.
10) Complete the Crossword with the Help of Clues Given Below.
Across
1. This is necessary for photosynthesis.
2. Term for components present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.
Down
1. Green plastids.
2. Formed by collection of tissues.
3. It separates the contents of the cell from the surrounding medium.
4. Empty structure in the cytoplasm.
7. A group of cells.
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Ans.
CHLOROPHYLL
ORGAN
ORGANELLE
MEMBRANE
VACUOLE
PROTOPLASM
TISSUE
GENES
Explanation:
Answer:
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