During respiration, oxygen moves from a region of its higher concentration outside the cell to a region of its lower concentration inside the cell, across the plasma membrane. This movement is best described as:

Diffusion, because a gas moves from higher to lower concentration

Active movement, because oxygen is pulled in against its concentration

Osmosis, because it occurs across the plasma membrane

Plasmolysis, because the cell loses material to the surroundings

The endoplasmic reticulum (ER) is of two types. A student notes that one type has tiny granules on its surface while the other is smooth. Which statement about the two types is correct?

Rough ER bears ribosomes and helps make proteins; smooth ER helps make fats (lipids)

Both types bear ribosomes, but only rough ER makes proteins

Rough ER bears ribosomes and helps make fats; smooth ER helps make proteins

Smooth ER bears ribosomes and makes proteins; rough ER stores water

Chapter testScienceIncluded in the seriesTest 10 of 22

CBSE Class 9 Science · Ch 2: Cell: The Building Block of Life

CBSE Class 9 Science · Ch 2: Cell: The Building Block of Life is an online chapter test in the CBSE Class 9 pattern, covering Cell: The Building Block of Life. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.

Questions

Minutes

Marks

None

Negative marking

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Topics in this test

Topic	Subject	Questions
Cell: The Building Block of Life	Science	30

Difficulty: 6 medium · 24 hard

The Building Block of Life MCQ questions with answers

The first 3 of 30 questions. Unlock the series for the rest, each with a solution.

Q1. In the cell, certain organelles possess their own genetic material (DNA) and can make some of their own proteins. On this basis, identify the 'odd one out' from the following:
कोशिका में, कुछ कोशिकांगों के पास अपना स्वयं का आनुवंशिक पदार्थ (DNA) होता है और वे अपने कुछ प्रोटीन स्वयं बना सकते हैं। इस आधार पर, निम्नलिखित में से 'बेमेल' (odd one out) की पहचान कीजिए:
- A. Nucleus / केंद्रक
- B. Plastids / लवक
- C. Mitochondria / माइटोकॉन्ड्रिया
- D. Golgi apparatus / गॉल्जी उपकरण
Solution
Mitochondria, plastids and the nucleus all contain DNA, but the Golgi apparatus has no genetic material of its own.
माइटोकॉन्ड्रिया, लवक और केंद्रक सभी में DNA होता है, परंतु गॉल्जी उपकरण का अपना कोई आनुवंशिक पदार्थ नहीं होता।
Q2. During respiration, oxygen moves from a region of its higher concentration outside the cell to a region of its lower concentration inside the cell, across the plasma membrane. This movement is best described as:
श्वसन के दौरान, ऑक्सीजन कोशिका के बाहर अपनी उच्च सांद्रता वाले क्षेत्र से कोशिका के भीतर अपनी निम्न सांद्रता वाले क्षेत्र की ओर, प्लाज़्मा झिल्ली के आर-पार गति करती है। इस गति का सर्वोत्तम वर्णन इस प्रकार है:
- A. Active movement, because oxygen is pulled in against its concentration / सक्रिय गति, क्योंकि ऑक्सीजन को उसकी सांद्रता के विरुद्ध अंदर खींचा जाता है
- B. Osmosis, because it occurs across the plasma membrane / परासरण, क्योंकि यह प्लाज़्मा झिल्ली के आर-पार होती है
- C. Plasmolysis, because the cell loses material to the surroundings / प्लास्मोलिसिस, क्योंकि कोशिका अपने परिवेश को पदार्थ खो देती है
- D. Diffusion, because a gas moves from higher to lower concentration / विसरण, क्योंकि गैस उच्च से निम्न सांद्रता की ओर गति करती है
Solution
The movement of a gas like oxygen from higher to lower concentration is diffusion; osmosis is specifically the movement of water across a membrane.
ऑक्सीजन जैसी गैस की उच्च से निम्न सांद्रता की ओर गति विसरण है; परासरण विशेष रूप से झिल्ली के आर-पार जल की गति है।
Q3. The endoplasmic reticulum (ER) is of two types. A student notes that one type has tiny granules on its surface while the other is smooth. Which statement about the two types is correct?
अंतर्द्रव्यी जालिका (ER) दो प्रकार की होती है। एक विद्यार्थी देखता है कि एक प्रकार की सतह पर छोटे-छोटे कण होते हैं जबकि दूसरी चिकनी होती है। इन दोनों प्रकारों के बारे में कौन-सा कथन सही है?
- A. Both types bear ribosomes, but only rough ER makes proteins / दोनों प्रकार राइबोसोम धारण करते हैं, परंतु केवल खुरदरी ER ही प्रोटीन बनाती है
- B. Rough ER bears ribosomes and helps make fats; smooth ER helps make proteins / खुरदरी ER राइबोसोम धारण करती है और वसा बनाने में सहायक है; चिकनी ER प्रोटीन बनाने में सहायक है
- C. Smooth ER bears ribosomes and makes proteins; rough ER stores water / चिकनी ER राइबोसोम धारण करती है और प्रोटीन बनाती है; खुरदरी ER जल संग्रहीत करती है
- D. Rough ER bears ribosomes and helps make proteins; smooth ER helps make fats (lipids) / खुरदरी ER राइबोसोम धारण करती है और प्रोटीन बनाने में सहायक है; चिकनी ER वसा (लिपिड) बनाने में सहायक है
Solution
Rough ER carries ribosomes on its surface and helps in protein synthesis, while smooth ER lacks ribosomes and helps make fats (lipids).
खुरदरी ER अपनी सतह पर राइबोसोम रखती है और प्रोटीन संश्लेषण में सहायता करती है, जबकि चिकनी ER में राइबोसोम नहीं होते और यह वसा (लिपिड) बनाने में सहायता करती है।

Frequently asked questions

How many questions are in the CBSE Class 9 Science · Ch 2: Cell: The Building Block of Life?

30 questions for 30 marks, to be answered in 20 minutes.

Is there negative marking in the CBSE Class 9 Science · Ch 2: Cell: The Building Block of Life?

No — wrong answers are not penalised in this test.

Which topics does the CBSE Class 9 Science · Ch 2: Cell: The Building Block of Life cover?

Cell: The Building Block of Life (30 questions).

Is the CBSE Class 9 Science · Ch 2: Cell: The Building Block of Life free?

It is part of the CBSE Class 9 Test Series 2027 — Chapter-wise + Full Tests (22 tests, ₹99). You can first try English · Ch 1: The Fun They Had for free.

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