All Free Biology MCQs with Answers

• A. Coleoptile
• B. Coleorrhiza
• C. Cotyledon
• D. Scutellum

Explanation: The coleorrhiza or root sheath is a protective layer of tissue that surrounds the radicle in monocotyledon seeds.

• A. Coleoptile
• B. Coleorrhiza
• C. Cotyledon
• D. Scutellum

Explanation: The Scutellum is part of the structure of a barley and rice seed-the modified seed leaf.

• A. Inflorescence
• B. Phosphorescence
• C. Luminescence
• D. Senescence

Explanation: An inflorescence is a cluster of flowers arranged on the main stem axis or peduncle of a plant.

• A. Corymb
• B. Umbel
• C. Raceme
• D. Spike

Explanation: A spike is a raceme except that the flowers are attached directly to the axis at the axil of each leaf rather than to a pedicel.

• A. Racemose
• B. Cymose
• C. Dichasial cyme
• D. Scorpioid cyme

Explanation: The type of inflorescence where flowers develop in acropetal succession is the "Scorpioid cyme." In a Scorpioid cyme, the youngest flower…

• A. Racemose
• B. Cymose
• C. Capitulum
• D. Spadix

Explanation: A spadix is a spike of flowers densely arranged around it, enclosed or accompanied by a highly specialised bract called a spathe.

• A. Corymb
• B. Umbel
• C. Raceme
• D. Spike

Explanation: In botany, an umbel is an inflorescence that consists of a number of short flower stalks (called pedicels) that spread from a common…

• A. Helicoid cyme
• B. Scorpioid cyme
• C. Dichasial cyme
• D. None of these

Explanation: Halicoid cyme is an inflorescence, or cyme, in which each flowering branch gives rise to one lateral branch that is coiled snail-like and…

• A. Helicoid cyme
• B. Scorpioid cyme
• C. Dichasial cyme
• D. None of these

Explanation: It is a monochasial cyme in which one lateral branch arises from base of the terminal flower. It has a curved axis.

• A. Corymb
• B. Capitulum
• C. Spadix
• D. Spike

Explanation: Corymb is a botanical term for an inflorescence with the flowers growing in such a fashion that the outermost are borne on longer pedicels…

• A. Water
• B. Suitable temperature
• C. Both (A) and (B)
• D. None of these

Explanation: The plant growth rate is affected by a number of factors both internal and external External factors are temperature, light, oxygen…

• A. Parthenogenesis
• B. Parthenocarpy
• C. Viviparous germination
• D. Apomixis

Explanation: In some cases, fruit development proceeds without fertilization, and thus no seed formation takes place e.g.

• A. Exine part
• B. Intine part
• C. Tube nucleus and generative nucleus
• D. All (A), (B) and (C)

Explanation: The pollen grain's intine and exine collaboratively provide structural integrity and protection.

• A. Epicotyl
• B. Hypocotyl
• C. Cotyledon
• D. All (A), (B) and (C)

Explanation: The epicotyl is the portion of the embryo above the cotyledons. In hypogeal germination, the epicotyl grows above the soil surface.

• A. Epicotyl
• B. Hypocotyl
• C. Cotyledon
• D. All (A), (B) and (C)

Explanation: Epigeal germination takes place due to the rapid growth of the hypocotyl.

• A. Epigeal germination
• B. Hypogeal germination
• C. Viviparous germination
• D. All choices are correct

Explanation: The special type of reproduction in which a seed starts germinating inside the fruit is Viviparous germination.

• A. Radicle
• B. Plumule
• C. Cotyledon
• D. Epicotyl

Explanation: The radicle is the embryonic root of a plant. It is the first organ to emerge during germination, and its primary function is to anchor…

• A. Parthenocarpy
• B. Parthenogenesis
• C. Apomixis
• D. Vernalization

Explanation: Vernalization is a biological process in plants where exposure to a period of low temperatures induces or accelerates flowering.

• A. Long-day plant
• B. Short-day plant
• C. Day-neutral plant
• D. None of these

Explanation: Day-neutral plants are not significantly influenced by day length for flowering.

• A. P307
• B. P370
• C. P703
• D. P700

Explanation: There are two photosystems, photosystem I (PS I) and photosystem II (PS II). These are named so in order of their discovery.