ACME ACADEMY

WEEKLY EVALUATION TEST

Subject: Science
Time Limit: 20 Mins
Max Marks: 20 Marks
Student Name:
Roll Number:
Class / Sec:
Date:

GENERAL INSTRUCTIONS:

  1. All questions are compulsory. Carefully read all instructions before starting.
  2. The question paper contains 20 questions.
  3. There is no negative marking for incorrect answers.
  4. Use of mobile phones, smartwatches, or calculators is strictly prohibited during the exam.
1. Who was the first scientist to observe cells by examining a thin slice of cork under a self-designed microscope in 1665?
[1 Mark]
(A) Camillo Golgi
(B) J. Craig Venter
(C) Robert Hooke
(D) Rudolf Virchow
2. What is the approximate limit of resolution of the unaided human eye when viewing objects at 25 cm?
[1 Mark]
(A) 1 mm
(B) 0.1 mm
(C) 0.01 mm
(D) 1 micrometer
3. Which cellular organelle is responsible for breaking down glucose to release energy, earning it the title 'powerhouse of the cell'?
[1 Mark]
(A) Golgi apparatus
(B) Lysosome
(C) Mitochondrion
(D) Chloroplast
4. What is the dense, round body inside the nucleus where ribosomal subunits are synthesized?
[1 Mark]
(A) Nucleolus
(B) Nucleoid
(C) Chromatin
(D) Vacuole
5. Which pigment is essential for photosynthesis and is found inside the chloroplasts of plant cells?
[1 Mark]
(A) Haemoglobin
(B) Chlorophyll
(C) Melanin
(D) Anthocyanin
6. Why is the cell membrane described as 'selectively permeable'?
[1 Mark]
(A) It allows absolutely everything to pass in and out of the cell.
(B) It is completely rigid and blocks all substances.
(C) It allows only certain specific substances to pass through while blocking others.
(D) It only allows water to exit the cell, but never enter.
7. According to the 'fluid-mosaic model', what are the primary structural components of the cell membrane?
[1 Mark]
(A) A rigid layer of cellulose.
(B) A lipid bilayer with embedded proteins.
(C) Solid blocks of carbohydrates.
(D) A single layer of nucleic acids.
8. How does the Rough Endoplasmic Reticulum (RER) physically differ from the Smooth Endoplasmic Reticulum (SER) under a microscope?
[1 Mark]
(A) RER is green, while SER is colourless.
(B) RER contains DNA, while SER contains RNA.
(C) RER has ribosomes attached to its surface, making it look rough.
(D) RER is found only in bacteria, while SER is found in plants.
9. In human beings, mature Red Blood Cells (RBCs) lack a nucleus. What is the biological advantage of this characteristic?
[1 Mark]
(A) It allows them to undergo rapid mitosis.
(B) It gives them more space to carry haemoglobin for oxygen transport.
(C) It makes them immune to all viral infections.
(D) It allows them to store large amounts of starch.
10. What is the defining structural difference between a prokaryotic cell and a eukaryotic cell?
[1 Mark]
(A) Prokaryotic cells have a well-defined, membrane-bound nucleus, while eukaryotic cells do not.
(B) Eukaryotic cells have a well-defined, membrane-bound nucleus and organelles, while prokaryotic cells lack them.
(C) Prokaryotic cells contain mitochondria, while eukaryotic cells contain chloroplasts.
(D) Eukaryotic cells are always unicellular.
11. Which organelle acts as the 'post office' of the cell by modifying, sorting, and packaging proteins and lipids into vesicles?
[1 Mark]
(A) Lysosome
(B) Ribosome
(C) Golgi apparatus
(D) Smooth Endoplasmic Reticulum
12. What is the specific biological term for the diffusion of water across a selectively permeable membrane from a dilute solution to a concentrated solution?
[1 Mark]
(A) Active transport
(B) Phagocytosis
(C) Plasmolysis
(D) Osmosis
13. Assertion (A): When placed in a concentrated sugar solution, a plant cell's inner content shrinks away from its cell wall. Reason (R): The plant cell gains water through osmosis because the external medium is hypotonic.
[1 Mark]
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
14. If a student estimates that 25 onion cells fit end-to-end across a microscope's visible field of 5 mm, what is the estimated length of a single onion cell?
[1 Mark]
(A) 250 µm
(B) 500 µm
(C) 200 µm
(D) 125 µm
15. Which type of cell division is primarily responsible for the growth of a child into an adult and the repair of skin after a cut?
[1 Mark]
(A) Meiosis
(B) Mitosis
(C) Binary fission
(D) Budding
16. Meiosis is a specialised form of cell division that occurs in reproductive organs. What is the chromosomal outcome for the daughter cells produced by meiosis?
[1 Mark]
(A) Two cells with the exact same number of chromosomes as the parent.
(B) Four cells, each with half the number of chromosomes as the parent.
(C) Four cells, each with double the number of chromosomes as the parent.
(D) Two cells, each with zero chromosomes.
17. Which of the following organelles is essentially a sac of digestive enzymes that cleans the cell by breaking down damaged organelles and waste?
[1 Mark]
(A) Vacuole
(B) Plastid
(C) Lysosome
(D) Endoplasmic Reticulum
18. A farmer uses large amounts of salt to preserve amla (gooseberries) in the form of pickles. How does this protect the food from spoilage-causing bacteria?
[1 Mark]
(A) The salt creates a hypertonic environment, causing bacterial cells to lose water by osmosis and die.
(B) The salt enters the bacteria and causes them to swell and burst.
(C) The salt undergoes a chemical reaction that creates toxic chlorine gas.
(D) The salt directly destroys the bacterial DNA without affecting water levels.
19. J. Craig Venter's team inserted synthetic DNA into a bacterium whose own DNA was removed. The cell began to function and divide according to the new DNA. What does this demonstrate?
[1 Mark]
(A) Cytoplasm is the true brain of the cell.
(B) Ribosomes alone can create life from scratch.
(C) The cell wall determines the genetic traits of an organism.
(D) DNA contains the coded instructions that control the cell's structure and activities.
20. Unlike an animal cell, a plant cell rarely bursts when placed in pure water (a hypotonic solution). Why?
[1 Mark]
(A) The plant cell actively pumps the water back out as fast as it comes in.
(B) The rigid cell wall exerts an inward pressure that limits expansion and prevents bursting.
(C) Plant cells do not undergo osmosis.
(D) The chloroplasts absorb all the excess water to use in photosynthesis.
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