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501 questions in this collection · Page 34 of 51
Question 331 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Persistent nucellus in the seed is called perisperm. In which plant is this found?
In some seeds such as black pepper and beet, remnants of nucellus are also persistent. This residual, persistent nucellus is the perisperm.
Question 332 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In the grass family, the single cotyledon is called the:
In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis.
Question 333 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In a monocot embryo, the shoot apex and leaf primordia are enclosed in a hollow foliar structure called:
Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the coleoptile.
Question 334 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Seed dormancy is a state of:
The embryo may enter a state of inactivity called dormancy.
Question 335 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following is a false fruit?
In a few species such as apple, strawberry, cashew, etc., the thalamus also contributes to fruit formation. Such fruits are called false fruits.
Question 336 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The oldest viable seed, Lupinus arcticus, was estimated to be dormant for how long?
The oldest is that of a lupine, Lupinus arcticus... The seed germinated and flowered after an estimated record of 10,000 years of dormancy.
Question 337 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
A 2000-year-old viable seed of Phoenix dactylifera was discovered at:
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.
Question 338 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following plants produces fruits containing thousands of tiny seeds?
Orchid fruits are one such category and each fruit contain thousands of tiny seeds.
Question 339 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Apomixis is defined as:
A few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilization, called apomixis.
Question 340 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Polyembryony involves the occurrence of:
Occurrence of more than one embryo in a seed is referred to as polyembryony.