CBSE Class 10 Biology Our Environment MCQs Set 18

Biology Objective Questions and Answers: Our Environment

Explore reliable objective questions for Our Environment tailored for Class 10 learners. Utilizing these Biology multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

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Multiple Choice Questions

Question 1: Regions with less than 25 cm of rainfall form the
(a) tundras
(b) coniferous forests
(c) savannahs
(d) deserts
Show Answer & Explanation

Answer: (d) deserts

Explanation:
1. Deserts are defined by very low rainfall (below about 25 cm a year).

Teacher's Note:
1. Low rainfall gives sparse xerophytic vegetation.
2. Tundra is defined by low temperature.

Question 2: The vast grasslands of North America are called
(a) prairies
(b) chaparrals
(c) savannahs
(d) pampas
Show Answer & Explanation

Answer: (a) prairies

Explanation:
1. Prairies are the temperate grasslands of North America.
2. Pampas are in South America and savannahs are tropical grasslands.

Teacher's Note:
1. Know the grassland names by continent.
2. Steppes are in Eurasia and veldt in South Africa.

Question 3: Pistia and Eichhornia are predominant in the ______ biome.
(a) lotic
(b) lentic
(c) littoral
(d) neritic
Show Answer & Explanation

Answer: (b) lentic

Explanation:
1. Pistia (water lettuce) and Eichhornia (water hyacinth) float in still water such as ponds and lakes.
2. Still water habitats are lentic; running water habitats are lotic.

Teacher's Note:
1. Lentic = standing water; lotic = flowing water.
2. Both are floating aquatic weeds.

Question 4: Small drifting animals in the ocean are called
(a) phytoplankton
(b) nekton
(c) zooplankton
(d) detritivores
Show Answer & Explanation

Answer: (c) zooplankton

Explanation:
1. Plankton drift with water currents; the animal members are zooplankton and the plant members are phytoplankton.

Teacher's Note:
1. Nekton are strong swimmers like fish.
2. Phytoplankton are the producers of the sea.

Question 5: Plants can mainly absorb nitrogen from the soil in the form of
(a) oxides of nitrogen
(b) nitrites
(c) free nitrogen gas
(d) nitrates
Show Answer & Explanation

Answer: (d) nitrates

Explanation:
1. Nitrifying bacteria convert ammonia to nitrite and then to nitrate.
2. Plants absorb nitrate through their roots.

Teacher's Note:
1. Plants cannot use N₂ directly.
2. Some bacteria and cyanobacteria fix N₂.

Question 6: The carbon required for food production by plants mainly comes from
(a) carbon dioxide of the air
(b) carbohydrates
(c) coal
(d) soil
Show Answer & Explanation

Answer: (a) carbon dioxide of the air

Explanation:
1. Plants take CO₂ from the air and fix it into glucose by photosynthesis.

Teacher's Note:
1. The atmosphere has about 0.04% CO₂.
2. Respiration and burning return CO₂ to the air.

Question 7: The main architects of the nitrogen cycle are
(a) green plants
(b) bacteria
(c) protozoans
(d) soil insects
Show Answer & Explanation

Answer: (b) bacteria

Explanation:
1. Nitrogen-fixing, nitrifying and denitrifying bacteria carry out the main steps of the cycle.

Teacher's Note:
1. Rhizobium fixes nitrogen in legume root nodules.
2. Denitrifying bacteria return N₂ to the air.

Question 8: The pioneer of the technology of pearl culture was
(a) Akbar
(b) a Chola king
(c) Mikimoto
(d) an American scientist
Show Answer & Explanation

Answer: (c) Mikimoto

Explanation:
1. Kokichi Mikimoto of Japan developed the technique of culturing pearls in oysters in the early 1900s.

Teacher's Note:
1. Pearls form around an irritant inside the oyster.
2. Culture pearls are made by inserting a nucleus.

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Our Environment Objective Questions & Solutions for Class 10 Biology

About Our Environment MCQs for Class 10 Biology

Explore reliable practice questions for Our Environment tailored for Class 10 Biology learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

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FAQs

Where can I access latest CBSE Class 10 Biology Our Environment MCQs Set 18?

You can get most exhaustive CBSE Class 10 Biology Our Environment MCQs Set 18 for free on StudiesToday.com. These MCQs for Class 10 Biology are updated for the 2026-27 academic session as per CBSE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Biology Class 10 material?

Yes, our CBSE Class 10 Biology Our Environment MCQs Set 18 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.

How do practicing Biology MCQs help in scoring full marks in Class 10 exams?

By solving our CBSE Class 10 Biology Our Environment MCQs Set 18, Class 10 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Biology.

Do you provide answers and explanations for CBSE Class 10 Biology Our Environment MCQs Set 18?

Yes, Biology MCQs for Class 10 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.

Can I practice these Biology Class 10 MCQs online?

Yes, you can also access online interactive tests for CBSE Class 10 Biology Our Environment MCQs Set 18 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.