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BIOLOGY 2 Marks Questions

MODEL PAPER 3 · Rajasthan Board (RBSE) STD 11 Science (Rajasthan - English Medium). 6 questions.

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2 Marks Questions

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6 questions · self-marked practice — reveal the answer and mark yourself.

Question 12 Marks
Differentiate between eyes of cockroach and eyes of frog.
Answer
Eyes of CockroachEyes of Frog
1. Compound eyes made of multiple units1. Simple eyes made of single units
2. Ommatidia comprise eyes.2. Lens comprise eyes
3. Project mosaic vision with less resolution.3. Stereoscopic vision with high resolution.
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Question 22 Marks
Differentiate between vascular tissues of gymnosperms and angiosperms.
Answer
Vascular Tissues of GymnospermsVascular Tissues of Angiosperms
Xylem is devoid of vessels.Xylem possesses vessels
Phloem does not contain sieve tubes.Sieve tubes are present
Phloem does not contain companion cells.Phloem posses companion cells.
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Question 32 Marks
What is the advantage of using radioactive isotope with a long half-life in biological experiments?
Answer
If an isotope has a shorter half-life (for example 11C that possesses a half-life of 20.5 minutes), it quickly decays and severely restricting its usefulness in biological experiments, which often take hours to complete. So an isotope with a longer half-life is useful.
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Question 42 Marks
Name the end products of light reaction of photosynthesis. Mention the fate of each of them.
Answer
ATP, NADPH, and oxygen are the end products of light reaction.
ATP and NADPH are used in the reduction step of the biosynthetic phase of photosynthesis. Oxygen is liberated into the atmosphere
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Question 52 Marks
Write any three advantages of scientific names.
Answer
Advantages of scientific names are:
i. These are acceptable in every part of the world.
ii. These are assigned on agreed principles by scientists.
iii. These are very specific. It means no two organisms can have the same name.
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Question 62 Marks
What are secondary sexual characters?
Answer
Characters which do not play direct role in sexual reproduction but are basically means of sexual differentiation are called secondary sexual characters. For example, facial hair and deep voice in males and thin voice in females are secondary sexual characters.
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