Persistent nucellus in the seed is called perisperm. In which plant is this found?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Black pepper
Explanation: In some seeds such as black pepper and beet, remnants of nucellus are also persistent. This residual, persistent nucellus is the perisperm.
In the grass family, the single cotyledon is called the:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Scutellum
Explanation: In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis.
In a monocot embryo, the shoot apex and leaf primordia are enclosed in a hollow foliar structure called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Coleoptile
Explanation: Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the coleoptile.
Seed dormancy is a state of:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Inactivity
Explanation: The embryo may enter a state of inactivity called dormancy.
Which of the following is a false fruit?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Apple
Explanation: In a few species such as apple, strawberry, cashew, etc., the thalamus also contributes to fruit formation. Such fruits are called false fruits.
The oldest viable seed, Lupinus arcticus, was estimated to be dormant for how long?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: 10,000 years
Explanation: The oldest is that of a lupine, Lupinus arcticus... The seed germinated and flowered after an estimated record of 10,000 years of dormancy.
A 2000-year-old viable seed of Phoenix dactylifera was discovered at:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: King Herod's Palace
Explanation: A recent record of 2000 years old viable seed is of the date palm, Phoenix dactylifera discovered during the archeological excavation at King Herod's palace.
Which of the following plants produces fruits containing thousands of tiny seeds?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Orchid
Explanation: Orchid fruits are one such category and each fruit contain thousands of tiny seeds.
Apomixis is defined as:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: Production of seeds without fertilization
Explanation: A few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilization, called apomixis.
Polyembryony involves the occurrence of:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: More than one embryo in a seed
Explanation: Occurrence of more than one embryo in a seed is referred to as polyembryony.