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Class 9 Science MCQ Questions of The Fundamental Unit of Life with Answers?

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Students are encouraged to practice the Class 9 Science MCQ Questions of The Fundamental Unit of Life with Answers are accessible here. Students can settle these MCQ Questions for class 9 Science with Answers and survey their preparation level. 

Solving The Fundamental Unit of Life Multiple Choice Questions of Class 9 Science can be of extreme assistance as you will know about every one of the concepts. These MCQ Questions of The Fundamental Unit of Life helps for a speedy correction of the Chapter. Subsequently helping you with upgrading knowledge.

Practice MCQ Questions for class 9 Chapter-Wise

1. Which of the following can be made into crystal?

(a) A bacterium
(b) An Amoeba
(c) A virus
(d) A sperm

2. Chromosomes are made up of

(a) DNA
(b) Protein
(c) DNA and protein
(d) RNA

3. Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

(a) Golgi apparatus
(b) Lysosomes
(c) Smooth endoplasmic reticulum
(d) Vacuoles

4. The undefined nuclear region of prokaryotes is also known as

(a) nucleus
(b) nucleolus
(c) nucleic acid
(d) nucleoid

5. Amoeba acquires its food through a process, termed

(a) exocytosis
(b) endocytosis
(c) plasmolysis
(d) exocytosis and endocytosis both

6. The process by which water moves through a semi-permeable membrane from a region of high concentration to a region of lower concentration, thereby equalizing water concentration is called:

(a) Evaporation
(b) Diffusion
(c) Osmosis
(d) All of the above

7. You must have observed that a fruit when unripe is green but it becomes beautifully coloured when ripe. According to you what is the reason behind this colour change?

(a) Chloroplasts change to chromosplasts
(b) Chromosplasts change to chromosomes
(c) Chloroplasts change to chromosomes
(d) Chromosplasts change to chloroplasts

8. The process of plasmolysis in a plant cell is defined as:

(a) Breakdown of the plasma membrane in hypotonic solution.
(b) Shrinkage of cytoplasm in hypertonic medium
(c) Shrinkage of Nucleoplasm.
(d) None of these

9. Cell wall is absent in

(a) Plants
(b) Bacteria
(c) Fungi
(d) Mycoplasma

10. Name two cell regions containing their own genetic material.

(a) Mitochondria and Plastids
(b) Lysosomes and ribosomes
(c) Nucleus and mitochondria
(d) Golgi apparatus and endoplasmic reticulum

11. Animal cell lacking nuclei would also lack in

(a) Endoplasmic reticulum
(b) Chromosome
(c) Lysosome
(d) Ribosome

12. The most abundant material in the plant cell wall is

(a) cellulose
(b) lipids
(c) proteins
(d) wax

13. Lysosome arises from

(a) endoplasmic reticulum
(b) golgi apparatus
(c) nucleus
(d) mitochondria

14. Cell theory was given by

(a) Schleiden and Schwann
(b) Virchow
(c) Hooke
(d) Haeckel

15. Silver nitrate solution is used to study

(a) endoplasmic reticulum
(b) golgi apparatus
(c) nucleus
(d) mitochondria

16. The cell will stay the same size…………………. Solution

(a) Hypertonic solution
(b) Hypotonic solution
(c) Isotonic solution
(d) None of them

17. Rod-shaped structure present in the nucleus called………….

(a) Cytoplasm
(b) Vacuole
(c) Proteins
(d) Chromosomes

18. Functional segments of DNA called …………

(a) RNA
(b) Genes
(c) Chromosome
(d) None of them

19. White or colorless plastids known as……………

(a) Plasmodium
(b) Plastid
(c) Chloroplast
(d) Leucoplast

20. The process of cell division by which most of the cells are divided for growth is called………….

(a) Reproduction
(b) Meiosis
(c) Mitosis
(d) None of them

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Answer:

1. Answer: (c) A virus

Explanation: 'A Virus'. Viruses are considered as the intermediates between living and non- living as they cannot metabolize or reproduce on their own. For all its processes virus requires a host. Viruses can be stored as crystal-like chemicals.

2. Answer: (c) DNA and protein

Explanation: Each chromosome is made up of two components (i) Deoxyribonucleic acid (DNA) (ii) Proteins (e.g.; his tones and acidic proteins) These consist of two (unreplicated) or four (duplicated) arms and a primary constriction or centromere which gives them a particular shape due to its position.

3. Answer: (c) Smooth endoplasmic reticulum

Explanation: Smooth endoplasmic reticulum(ER) is responsible for the detoxification of a number of organic chemicals.

4. Answer: (d) nucleoid

Explanation: The nucleoid (meaning nucleus-like) is an irregularly shaped region within the prokaryotic cell that contains all or most of the genetic material.

5. Answer: (b) endocytosis

Explanation: Amoeba is an unicellular organism. It shows the holozoic mode of nutrition where it engulfs the whole food and digests it using various digestive enzymes. This method of engulfing the food molecule is called endocytosis or phagocytosis.

6. Answer: (c) Osmosis

Explanation: Osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell's partially permeable membrane.

7. Answer: (a) Chloroplasts change to chromosplasts

Explanation: The change in color of the fruits on ripening is a chemical change. ... An unripe fruit is green because it contains chloroplasts in its skin. Towards the ripening of the fruit, the chloroplasts are changed into chromoplasts which gives the fruit attractive non-green colour.

8. Answer: (b) Shrinkage of cytoplasm in hypertonic medium.

Explanation: Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell. Plasmolysis is one of the results of osmosis and occurs very rarely in nature, but it happens in some extreme conditions.

9.Answer: (d) Mycoplasma

Explanation: Mycoplasma (Kingdom-Monera) are the simplest and smallest free living prokaryotes which are devoid of a cell wall. Plasma membrane forms the outer boundary of the cell of mycoplasma. Nostoc is a cyanobacterium (Kingdom- Monera), in which cell wall comprises of peptidoglycans.

10. Answer: (a) Mitochondria and Plastids

Explanation: Chloroplast and mitochondria are the double membranous cell organelle. These two cell organelle, are the only one which contains their own genetic component that is the DNA.

11. Answer: (b) Chromosome

Explanation: An Animal cell lacking nuclei would also lack in chromosomes. The cells which lack chromosomes are Red blood cells and platelets. Chromosomes occur during cell division, and they are formed due to the coiling and folding of chromatin. If any animal cell lacks a nucleus then it will lack of chromosomes too.

12.Answer: (a) cellulose

Explanation: The cell wall is composed of cellulose, the most abundant and resistant polysaccharide on earth.

13. Answer: (b) golgi apparatus

Explanation: lysosomes which arise from the Golgi apparatus. Together with the Golgi apparatus, the endoplasmic reticulum is called the cell's protein machinery. Likewise, the lysosome proteins from the Golgi apparatus are marked and bundled with the late endosome in a specific vesicle to create a mature lysosome.

14. Answer: (a) Schleiden and Schwann

Explanation: The classical cell theory was proposed by Theodor Schwann in 1839.These parts were based on a conclusion made by Schwann and Matthias Schleiden in 1838, after comparing their observations of plant and animal cells.

15. Answer: (b) golgi apparatus

Explanation: Silver nitrate solution is used for studying the Golgi Apparatus. Golgi apparatus is an organelle that is present in eukaryotic cells which consists of a stack of flattened sacs.

16. Answer: (c) Isotonic solution

Explanation: If a cell is placed in an isotonic solution, there will be no net flow of water into or out of the cell, and the cell's volume will remain stable. If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.

17. Answer: (d) Chromosomes

Explanation: The rod-shaped structures in the cell nucleus that contain genes are called chromosomes.

18. Answer: (b) Genes

Explanation: Genes are the functional segments of DNA as they are capable of producing mRNA.

19. Answer: (d) Leucoplast

Explanation: Leucoplasts: colorless plastids for monoterpene synthesis; leucoplasts sometimes differentiate into more specialized plastids: Amyloplasts: for starch storage and detecting gravity (for geotropism).

20. Answer: (c) Mitosis 

Explanation: Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Mitosis is a fundamental process for life. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells.

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