Class 9 Science Chapter-2 Cell: The Building Block of Life
MCQ Questions with Answers (Part-2)
1. Which of the following human cells is specialised to not have a nucleus when it is mature, providing more space to transport oxygen?
D) Red Blood Cell (RBC)
2. What is the specific term used for the functional segments of a DNA molecule?
B) Genes
3. The Rough Endoplasmic Reticulum (RER) appears rough under an electron microscope due to the presence of which structures attached to its surface?
C) Ribosomes
4. Inside a chloroplast, there is a semi-fluid substance that houses disc-shaped membrane structures containing chlorophyll. What is this semi-fluid substance called?
D) Stroma
5. Which type of plastids contain pigments like yellow, orange, or red, which attract pollinators and help in seed dispersal?
C) Chromoplasts
6. Which of the following are infectious agents that are acellular and consist only of misfolded proteins without any genetic material?
D) Prions
7. The genetically regulated and organised process of selective cell destruction, which is responsible for forming fingers by eliminating cells between digits during human embryo development, is known as:
C) Programmed Cell Death (PC
8. In 1902, Austrian botanist Gottlieb Haberlandt proposed that a single mature plant cell can develop into a complete plant. This special ability is known as:
A) Totipotency
9. Which scientist and his team chemically synthesised an exact copy of DNA for the bacterium Mycoplasma mycoides and successfully inserted it into another cell?
C) J. Craig Venter
10. Errors in which cellular process can lead to uncontrolled cell division and the formation of tumours?
B) Mitosis
11. Which famous Indian botanist invented many useful lab methods to study chromosomes in plants and received the Padma Bhushan for his contributions?
D) Arun Kumar Sharma
12. In a mature plant cell, which organelle is responsible for storing water, minerals, sugars, and waste, and helps keep the plant cell firm by maintaining internal pressure?
C) Large central vacuole
13. What happens to the inner content of a plant cell when it is placed in a concentrated (hypertonic) sugar solution?
A) It shrinks and pulls away from the rigid cell wall.
14. The energy released during cellular respiration in the mitochondria is stored in the form of which molecule?
D) ATP (Adenosine Triphosphate)
15. In an animal's body, meiosis occurs exclusively in which of the following locations to produce gametes?
D) Cells of reproductive organs (testes and ovaries)
16. Who first observed the Golgi apparatus in the nerve cells of a barn owl in 1898?
B) Camillo Golgi
17. What is the meaning of the terms "pro" and "karyon" in the word "prokaryotic"?
B) Primitive and nucleus
18. Which of the following is an example of cell inclusions found in the cytoplasm of some plant cells?
C) Crystals of calcium oxalate or silica
19. The idea of "totipotency" proposed by Gottlieb Haberlandt laid the foundation for which branch of biology?
C) Plant Tissue Culture Technology
20. When estimating the size of a cell under a microscope, what is the conversion rate from millimetres (mm) to micrometres (µm)?
C) 1 mm = 1000 µm
21. Which of the following infectious agents lack a protein coat around their genetic material?
B) Viroids
22. What specific role do the lysosomal enzymes in human sperm cells play during fertilisation?
C) They help break down the outer layer of the egg.
23. In eukaryotic cells, which structure forms a network of fine fibres that provides structural support and enables internal transport?
B) Cytoskeleton
24. In 1838 and 1839, which two scientists respectively reported that all plants and all animals are made up of cells?
B) Matthias Schleiden and Theodor Schwann
25. During the experiment to observe cell division in onion root tips, which acid is used to soften the root tissue on the slide?
C) Dilute Hydrochloric acid (HCl)
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