Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology seeds - structure and germination germination seed germination the flower

In vivipary type of seed germination, the seeds undergo _________________.

  1. Twelve months of resting period

  2. Six months of resting period

  3. Three months of resting period

  4. No resting period
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In viviparous seed germination, seeds germinate directly on the parent plant without entering a dormant or resting period, allowing immediate establishment upon dropping.

Multiple choice biology seeds - structure and germination germination seed germination the flower

In germinating oil seeds $\beta$-oxidation of free fatty acids takes place in ______________.

  1. Oleosoines

  2. Glyoxysomes

  3. Mitochondria

  4. Cytosol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During the germination of oil seeds, the beta-oxidation of fatty acids occurs inside specialized microbodies called glyoxysomes. These organelles contain the enzymes of the glyoxylate cycle, converting fatty acids into carbohydrates to support growth.

Multiple choice biology seeds - structure and germination germination seed germination the flower

In nature, the orchid seeds germinate only in association with _______________.

  1. Myxomycetes

  2. Mycorrhiza

  3. Blue green algae

  4. Actinomycetes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Orchid seeds lack stored food reserves and depend entirely on a symbiotic relationship with mycorrhizal fungi to provide nutrients for germination in nature. Without this fungal association, natural germination does not occur.

Multiple choice biology seeds - structure and germination germination seed germination the flower

During germination of barley grain, the enzyme a-amylase is secreted by ______________.

  1. Seed coat

  2. Aleuronic layer

  3. Coleorhizae

  4. Coleoptiles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In cereal grains like barley, the aleurone layer synthesizes and secretes hydrolytic enzymes such as alpha-amylase upon stimulation by gibberellic acid during germination. These enzymes break down starchy endosperm reserves into sugars for the embryo.

Multiple choice biology seeds - structure and germination germination seed germination the flower

In maize(Zea mays) fertilization takes place between a female parent having colourless endosperm and the male parent having yellow endosperm. After fertilization, the endosperm of the new seed becomes yellow. This phenomenon is known as ___________.

  1. Dominance

  2. Xenia

  3. Met xenia

  4. Paternal influence
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Xenia refers to the effect of pollen on the maternal tissues or endosperm of the seed, causing the immediate phenotypic expression of paternal traits. In this case, the yellow endosperm trait from the male parent is expressed in the hybrid seed's endosperm.

Multiple choice biology seeds - structure and germination germination seed germination the flower

In which one of the following pathogens do the cells of promycelium after the germination of teleutospore produced infection hyphae instead of basidiospores?

  1. Ustilago scitaminae

  2. Tilletia foetida

  3. Tilletia tritici

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

In Ustilago scitaminae, the promycelium typically produces infection hyphae directly rather than forming basidiospores, which is a characteristic feature of this smut fungus.

Multiple choice biology seeds - structure and germination germination seed germination the flower

Kinetin was first isolated from _________________.

  1. Immature corn seeds

  2. DNA of coconut milk

  3. DNA of herring sperm

  4. DNA of monkey's liver
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Kinetin, a type of cytokinin that promotes cell division, was first isolated by Miller and coworkers as a degradation product from autoclaved herring sperm DNA.

Multiple choice biology seeds - structure and germination germination seed germination the flower

During the germination of coconut, the major stored food is digested by.

  1. a-amylase

  2. Lipase

  3. Protease

  4. Trypsin
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coconut is an oil seed with an endosperm rich in fats and lipids. During germination, the stored lipids must be broken down by lipases to provide energy and carbon skeletons for the growing embryo.