The dormant state of a seed is characterized by:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Reduced metabolic activity
Explanation: The general metabolic activity of the embryo slows down. The embryo may enter a state of inactivity called dormancy.
The wall of the fruit is called:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Pericarp
Explanation: The wall of the ovary develops into the wall of fruit called pericarp.
Strawberry is a false fruit because:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: It develops from the thalamus
Explanation: In a few species such as apple, strawberry... the thalamus also contributes to fruit formation. Such fruits are called false fruits.
A banana is an example of:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Parthenocarpic fruit
Explanation: Parthenocarpic fruits. Banana is one such example.
Which orchid fruit contains thousands of tiny seeds?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: Orchid
Explanation: Orchid fruits are one such category and each fruit contain thousands of tiny seeds.
Nucellar polyembryony is common in:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Citrus
Explanation: More often, as in many Citrus and Mango varieties... develop into the embryos.
Use of apomictic seeds in agriculture is beneficial because:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: They maintain hybrid characters
Explanation: If these hybrids are made into apomicts, there is no segregation of characters... farmers can keep on using the hybrid seeds.
Which part of the stamen is attached to the thalamus?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Proximal end of filament
Explanation: The proximal end of the filament is attached to the thalamus or the petal.
The anther is generally:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Bilobed
Explanation: A typical angiosperm anther is bilobed.
How many microsporangia are found in a typical dithecous anther?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Four
Explanation: The anther is a four-sided (tetragonal) structure consisting of four microsporangia.