Biology 12 Imp Questions chapter 21 from past papers

Biology 12 Imp Questions chapter 21 from past papers of Punjab boards. These important biology 12 mcqs, short and long questions are collected by going through different past papers of all Punjab Board Pakistan.

Why are these questions important?

These Questions are taken from past papers of Biology Class 12. These questions are top repeated of in previous papers of Biology 12 of all Punjab boards as;

      Bahawalpur Board

      D.G.Khan Board

      Faisalabad Board

      Gujranwala Board

      Lahore Board

      Multan Board

      Rawalpindi Board

Content is created and designed with intense care and diligence. Here is only the most important MCQ, short questions and long questions of Biology 12 chapter 21 Cell Cycle.

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You can easily download in pdf format or view Biology 12 chapter mcqs, short questions and long questions  online. You can easily print these files in simple way. Here you find Biology 12 chapter 21 Cell Cycle important mcqs, short and long questions. By Preparing these important questions, you will achieve splendid marks in Biology 12. This content is very helpful for weak students and also helpful for those students that are better at Biology 12 exam preparation. These Questions are based on the current Biology 12 syllabus according to Punjab Textbook Board.

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About This Chapter

chapter 21 cell cycle of  Biology 12 enables the students to learn Cell cycle in details. Students learn about The Chromosomal Theory of Inheritance. Students learn Mitosis and Meiosis in details. Students learn importance of meiosis and mitosis in details. Students learn Meiotic errors ( Non-disjunction). This Post "Biology 12 Imp Questions chapter 21 from past papers" covers all important mcqs, short and long questions related to important  topics of this chapter.

👉Imp MCQs - Biology Class 12 CH # 21

1. Synapsis start during :

(A) Zygotene

(B) Pachytene

(C) Diplotene

(D) Leptotene

(A) Zygotene

2. The chromosome number become doubled during  

(A) G1 Phase

(B) G2 Phase

(C) G0 Phase

(D) S Phase

(D) S Phase

3. The most critical phase of mitosis is    

(A) Prophase

(B) Anaphase

(C) Telophase

(D) None of these

(B) Anaphase

4. Which proteins are activated during cytokinesis
    

(A) Fibrin

(B) Myosin

(C) Tropomyosin

(D) Actin & Myosin

(D) Actin & Myosin

5. In case of human cell, cell cycle duration is about:

(A) 24 hours

(B) 20 hours

(C) 12 hours

(D) 8 hours

(A) 24 hours

6. Which syndrome have trisomy of chromosome no. 18 is ?

(A) Patau's 

(B) Jacob's

(C) Edward's

(D) Both A & B

(C) Edward's

7. Spindle fibers are composed of RNA and protein:

(A) Myosin

(B) Tubulin

(C) Actin

(D) Fibrinogen

(B) Tubulin

8. Spreading of tumor to secondary areas of the growth is called ? 

(A) Metastasis

(B) Epistasis

(C) Both

(D) None

(A) Metastasis

9. Exchange of chromosome segment due to chiasmata formation is called :

(A) Mitosis

(B) Crossing Over

(C) Linkage

(D) None of these

(B) Crossing Over

10. When cell start dividing, ____ become visible :

(A) Nucleus

(B) Chromosomes

(C) Nuclear membrane

(D) Nucleolus

(B) Chromosomes

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👉Other Chapters (PDF) of Biology Class 12 Punjab Textbook Board

✅Chapter 15

Homeostasis

✅Chapter 16

Support and Movement

✅Chapter 17

Coordination and Control

✅Chapter 18

Reproduction

✅Chapter 19

Growth and Development

✅Chapter 20

Chromosomes and DNA

✅Chapter 22

Variation and Genetics

✅Chapter 23

Biotechnology

✅Chapter 24

Evolution

✅Chapter 25

Ecosystem

✅Chapter 26

Some Major Ecosystems

✅Chapter 27

Man and his Environment