Biology ยท Science General

Botany and Plant Science

4,989 Questions

Botany and plant science delve into the biological study of plant life, covering structural anatomy, physiological processes, and reproductive mechanisms. Key topics include inflorescence patterns, root modifications, and seed development, which are vital for biology sections in medical entrance exams. This collection of practice questions helps solidify understanding of complex plant functions.

Plant ReproductionPlant AnatomyRoot ModificationsInflorescence PatternsPlant Morphology

Botany and Plant Science Questions

Multiple choice

When is the leaf insertion said to be ramal?

  1. When the leaves are present on the nodes of the branches

  2. When the leaves are present directly on the nodes of the main stem

  3. When the leaves are present on the apical position on the stem

  4. When the leaves are present on the reduced discoid stem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ramal is a sencondary position insertion, leaves are borne on branches

Multiple choice

How does the phyllode differ from phylloclade?

  1. It does not bear auxilliary buds

  2. IIt does not have structures like bristles, scle leaves, etc

  3. It is always in horizontal orientation

  4. It is a modified stem with leaf-like appearance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

these structures are present in phyllocalde and are absent in phyllode

Multiple choice

_____ flowers are composed of the organs of female reproductive system; style and ovary.

  1. Pistillate

  2. Gynoecium

  3. Perianth

  4. Androcium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pistillate flowers contain only female reproductive organs (pistil), which includes the stigma, style, and ovary. Gynoecium refers to the collective female parts, but pistillate specifically describes flowers with only these female structures. Perianth is the non-reproductive outer parts, and androecium refers to male structures.

Multiple choice

In _________, the pollen produced by the anther of a flower is transferred to the stigma of the same flower or to the stigma of another flower borne on the same plant.

  1. self pollination

  2. cross pollination

  3. fertilization

  4. pollination
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Self-pollination occurs when pollen from an anther fertilizes the stigma of either the same flower (autogamy) or another flower on the same plant (geitonogamy). Cross pollination involves different plants, fertilization is the fusion of gametes, and pollination is the broader process.

Multiple choice

In ______, the flowers possess structural features which do not allow self pollination.

  1. protogyny

  2. protandry

  3. herkogamy

  4. heterostyly
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Herkogamy is a structural mechanism where physical barriers (like unequal stamen and stigma positions or floral architecture) prevent self-pollination. Protogyny and protandry are temporal mechanisms (timing differences), while heterostyly involves different style lengths in different flowers.

Multiple choice

The nucleus formed by the fusion of the polar nuclei and forms the _________.

  1. tube nucleus

  2. generative nucleus

  3. endosperm nucleus

  4. zygote
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The fusion of two polar nuclei (in the embryo sac) with one male gamete forms the triploid (3n) endosperm nucleus, which develops into nutritive endosperm tissue. The zygote forms from egg + male gamete, while tube and generative nuclei are pollen structures.