Class :- IX FUNDAMENTAL UNIT OF LIFE 1. What is active transport? 2. Where are genes located? 3. Which organelle is associated with ribosome formation? 4. Which organelles other than nucleus contain DNA? 5. Which microorganisms can be made into crystal? 6. Which organelle detoxify many poisons and drugs in a cell? 7. Why is endocytosis found in animals only? [NCERT Exemplar] 8. There would be no plant life if chloroplasts did not exist. Justify. 9. Why do the animal cells not have cell wall? 10. What is the significance of pores present on the nuclear membrane?
Answers
Answer:
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Explanation:
1. In cellular biology, active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. ... Active transport requires cellular energy to achieve this movement.
2. Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus. A chromosome contains hundreds to thousands of genes.
3. The nucleolus: an organelle formed by the act of building a ribosome.
Answer:
1. Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient.
2. Genes are located in the DNA.
3. Rough Endoplasmic Reticulum.
4. Mitochondria and Plastid.
5. Virus
6. Smooth Endoplasmic Reticulum
7. Because animal cell lack cell wall.
8. Because plant perform photosynthesis which requires chlorophyll and chloroplast contain chlorophyll.
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