Prepare for NEET Biology Morphology of Flowering Plants (Seed) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert solutions to identify seed structure, dormancy, and germination.
NEET Questions / Botany / Morphology of Flowering Plants / Seed
A dormant seed of a desert plant exhibits an extremely low metabolic rate. Which of the following biochemical changes contributes MOST significantly to this state?
Increased gibberellin biosynthesis and rapid cell division
High abscisic acid (ABA) levels and dehydration of cellular components
Elevated ethylene production and fruit ripening processes
Increased cytokinin concentration and enhanced protein synthesis
Certain seeds require a period of cold exposure before germination, a process known as stratification. This requirement primarily ensures:
Increased seed coat permeability to oxygen solely
Activation of enzymes responsible for nutrient mobilization only
Leaching of germination inhibitors and promotion of gibberellin biosynthesis
Vernalization of the embryo and subsequent flowering
The aleurone layer in a monocot seed plays a crucial role in:
Protecting the embryo from mechanical damage
Storing starch and other reserve materials
Synthesizing and secreting hydrolytic enzymes for endosperm breakdown
Absorbing water and initiating germination
Which of these combinations correctly matches the seed type with its corresponding post-fertilization structure?
Monocot seed - Fruit with one cotyledon and endosperm; Dicot seed - Fruit with two cotyledons and reduced/no endosperm
Monocot seed - Fruit with two cotyledons and no endosperm; Dicot seed - Fruit with one cotyledon and endosperm
Monocot seed - Fruit with one cotyledon and no endosperm; Dicot seed - Fruit with two cotyledons and endosperm
Monocot seed - Fruit with two cotyledons and endosperm; Dicot seed - Fruit with one cotyledon and no endosperm
In a recalcitrant seed, which physiological factor is PRIMARILY responsible for its inability to withstand desiccation?
Presence of germination inhibitors that prevent metabolic slowdown
Lack of protective proteins that stabilize cellular components during drying
High sensitivity of cellular membranes to dehydration damage
Rapid depletion of stored reserves during the early stages of desiccation
The suspensor in a developing dicot embryo plays a critical role in:
Protecting the embryo from pathogens and environmental stress
Synthesizing growth hormones and regulating embryo development
Forming the root apical meristem and initiating root development
Pushing the embryo into the endosperm and facilitating nutrient absorption
Which part of a seed develops into the root system of a new plant?
Plumule
Cotyledon
Endosperm
Radicle
The protective outer covering of a seed is called the:
Endosperm
Seed coat
Cotyledon
Embryo
A seed which contains only one cotyledon is called:
Dicotyledonous
Monocotyledonous
Polycotyledonous
Acotyledonous
What is the function of the cotyledons in a seed?
Protect the embryo
Absorb water
Anchor the seedling
Store food for the embryo
