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Q.1 Easy Botany

Which of the following statements about plasmolysis is TRUE?

A Plasmolysis is the separation of cell wall from cell membrane

B Plasmolysis occurs in hypertonic solutions

C Plasmolysis leads to cell death immediately

D Both A and B

Correct Answer: D. Both A and B

Explanation:

Plasmolysis is the shrinkage of protoplasm away from the cell wall when placed in hypertonic solution. It's reversible if not prolonged.

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Q.2 Easy Botany

Which organelle is responsible for the synthesis of ribosomal RNA in plant cells?

A Ribosome

B Nucleolus

C Rough endoplasmic reticulum

D Golgi apparatus

Correct Answer: B. Nucleolus

Explanation:

The nucleolus within the nucleus is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly in eukaryotic cells.

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Q.3 Easy Botany

Which of the following is a C4 plant commonly found in tropical regions?

A Wheat

B Rice

C Sugarcane

D Potato

Correct Answer: C. Sugarcane

Explanation:

Sugarcane is a C4 plant adapted to high light and temperature conditions. C4 plants first fix CO2 into a 4-carbon compound (oxaloacetate).

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Q.4 Easy Botany

Which statement about stomata is INCORRECT?

A Guard cells regulate stomatal opening through osmotic potential changes

B Stomata open during night to minimize water loss

C Abscisic acid causes stomatal closure in stress conditions

D Potassium ion accumulation in guard cells causes stomatal opening

Correct Answer: B. Stomata open during night to minimize water loss

Explanation:

Stomata open during the day (when light is available for photosynthesis) and close at night. This reduces water loss during low photosynthetic activity periods.

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Q.5 Easy Botany

Which of the following is the primary pigment responsible for capturing light energy in photosynthesis?

A Chlorophyll a

B Chlorophyll b

C Xanthophyll

D Carotenoid

Correct Answer: A. Chlorophyll a

Explanation:

Chlorophyll a is the primary pigment that directly participates in the light reactions of photosynthesis and forms the reaction centre of both photosystems.

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Q.6 Easy Botany

The double fertilization process unique to angiosperms results in the formation of:

A Embryo and endosperm

B Seed coat and hilum

C Ovule and integuments

D Pollen and stigma

Correct Answer: A. Embryo and endosperm

Explanation:

One sperm nucleus fertilizes the egg (embryo), another fuses with polar nuclei (endosperm); this endosperm provides nutritive tissue for the developing embryo.

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Q.7 Easy Botany

Which plant hormone promotes fruit ripening and is commercially used in India for tomato and mango maturation?

A Gibberellin

B Ethylene

C Cytokinin

D Auxin

Correct Answer: B. Ethylene

Explanation:

Ethylene (C₂H₄) is the ripening hormone that triggers color change, softening, and aroma development in climacteric fruits.

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Q.8 Easy Botany

The phenomenon of etiolation in plants is characterized by:

A Increased chlorophyll synthesis in darkness

B Elongated internodes, pale color, and reduced photosynthetic capacity

C Increased leaf area in low light

D Enhanced root development

Correct Answer: B. Elongated internodes, pale color, and reduced photosynthetic capacity

Explanation:

Etiolation is the adaptation to grow in darkness: shoots elongate, leaves remain pale (no chlorophyll), and seedlings appear yellowish.

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Q.9 Easy Botany

Which of the following is a C4 plant commonly cultivated in India for fodder and grain production?

A Wheat

B Maize (Corn)

C Rice

D Barley

Correct Answer: B. Maize (Corn)

Explanation:

Maize is a C4 plant with higher photosynthetic efficiency and drought tolerance compared to C3 crops like wheat and rice.

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Q.10 Easy Botany

Which enzyme catalyzes the carboxylation of RuBP in the Calvin cycle, and what is its full name?

A Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase)

B Phosphofructokinase

C Aldolase

D Pyruvate dehydrogenase

Correct Answer: A. Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase)

Explanation:

Rubisco is the most abundant enzyme on Earth and catalyzes both carboxylation (photosynthesis) and oxygenation (photorespiration) of RuBP.

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