2nd Year Biology Chapter 21 Notes

• Important 2nd Year Biology Chapter 21 mcqs for Intermediate part-II students.
• 1. At cytokinesis in plants, a membrane structure phragmoplast is formed from vesicles which originate form:  (A) Golgi complex  (B) Lysosomes  (C) Endoplasic retcuium  (D) Centrioles
• 2. The most critical phase of mitosis , which ensures equal distribution of chromatids in the daughter cells is:  (A) Metaphase  (B) Anaphase  (C) Prophase  (D) Telophase
• 3. During cell division, the nuclear division is called?  (A) Cytokinesis  (B) Plasmolysis  (C) Karyokinesis  (D) Diakinesis
• Important 2nd Year Biology Chapter 21 important short questions for Intermediate part-II students.
• 4. Chromosomes become double during the phase of Cell Cycle?  (A) M - Phase  (B) G1 - Phase  (C) S - Phase  (D) G2 - Phase
• 5. The full cell cycle in yeast cells is completed in:  (A) 24 hours  (B) 90 minutes  (C) 4.5 hours  (D) 30 minutes
• 6. Cell cycle involves:  (A) Growth of cell  (B) Cell division  (C) Growth of cell, replication of DNA cell division  (D) Replication of DNA
• 7. The stage of mitosis at which chromatids separate as independent structures ( chromos- omees ) in the:  (A) Prophase  (B) Anaphase  (C) Telophase  (D) Metaphase
• Important 2nd Year Biology Chapter 21 important long questions for Intermediate part-II students.
• 8. The spindle fibers are composed of RNA and protein called?  (A) Insulin  (B) Tubulin  (C) Actin  (D) Myosin
• 9. The phase of mitosis which ensures equal distribution of chromatids in daughter cell is:  (A) Anaphase  (B) Metaphase  (C) Prophase  (D) Telophase
• 10. Mitotic apparatus is organized during:  (A) Metaphase  (B) Prophase  (C) Anaphase  (D) Telophase
• 11. Phragmoplast is formed by vesicles originated from:  (A) Chloroplast  (B) Mitochondria  (C) Golgi complex  (D) Endoplasmic
• Important Biology second year Chapter 21 short questions for Intermediate part-II students.
• 12. Each chromosome when visible consists of two unseparated replicas:  (A) Chiasma  (B) Tetrad  (C) Homologus cms  (D) Chormatids
• 13. The division of whole cell is called?  (A) Cytokinesis  (B) Karyokinesis  (C) Interphase  (D) Kinetochore

• What does you know about chromatin?
• In higher plants instead of visible centriole what is present?
• What is metastasis?
• Define cell cycle and How much time is required for cell cycle in case of human?
• When in plants and animals the meiosis take place?
• Define crossing over.
• What are the two significant happenings of meiosis?
• How many chromosomes do occur in male affected by Klinefelter's syndrome?
• What are the symptoms of Turner's syndrome?
• Name the different stages of interphase.
• What is G1 phase? What is G0?
• What is S-phase of cell cycle?
• What happens in G2-phase (pre-mitotic phase)?
• What are two conventional phases of Mitosis?
• What is the Mitotic apparatus?
• Name the microtubules that originate from centrioles.
• What events occur in the Prophase of mitosis?
• What happens in the Telophase of mitosis?
• What is Phragmoplast?
• Define cancer. and What is Tumour?
• What are two basic types of tumour?
• What is benign tumours? What is malignant tumour?
• How can you distinguish cancer cells from normal cells?
• What main causes of cancer?
• How prophase of meiosis differs from that of mitosis?
• What are homologous chromosomes? 
• Name the sub-stages of prophase I of meiosis?
• What events occur in metaphase I of meiosis?
• How does anaphase I of meiosis differs from that of mitosis?
• How meiosis maintains chromosome number constant generation after generation?
• Define non-disjunction.
• What is autosomal non-disjunction?
• What is Downs Syndrome (Mongolism)? 
• Does Downs syndrome is related to the age of mother?
• What are apparent symptoms or effects of Downs syndrome?
• What is sex chromosomal non-disjunction?
• Important long question of Biology 2nd year chapter 21