Apple and Strawberry are examples of "false fruits" because:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: The thalamus contributes to fruit formation.
Explanation: In a few species such as apple, strawberry, cashew, etc., the thalamus also contributes to fruit formation. Such fruits are called false fruits.
Parthenocarpic fruits, such as banana, develop:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Without fertilization.
Explanation: Fruits develop without fertilization. Such fruits are called parthenocarpic fruits.
The oldest viable seed discovered, Lupinus arcticus, germinated after an estimated dormancy of:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: D
Answer: 10,000 years
Explanation: The seed germinated and flowered after an estimated record of 10,000 years of dormancy.
Apomixis is a phenomenon where:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: A
Answer: Seeds are produced without fertilization.
Explanation: Apomixis is a special mechanism to produce seeds without fertilization.
Polyembryony, as seen in Citrus and Mango, involves embryos developing from:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Nucellar cells protruding into the embryo sac.
Explanation: In many Citrus and Mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into the embryos.
What is the primary advantage of using apomictic seeds in the hybrid seed industry?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: They prevent segregation of hybrid characters.
Explanation: If hybrids are made into apomicts, there is no segregation of characters in the hybrid progeny. Farmers can keep on using the hybrid seeds year after year.
The proximal end of the filament of a stamen is attached to the:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Thalamus or Petal
Explanation: The proximal end of the filament is attached to the thalamus or the petal of the flower.
Which of the following describes the structure of a typical angiosperm anther?
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: C
Answer: Bilobed and dithecous
Explanation: A typical angiosperm anther is bilobed with each lobe having two theca, i.e., they are dithecous.
In the transverse section of an anther, the microsporangia develop further to become:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Pollen sacs
Explanation: The microsporangia develop further and become pollen sacs.
The process of formation of microspores from a Pollen Mother Cell (PMC) is termed:
[Sexual-Reproduction-in-Flowering-Plants] [class-xii]
Correct Option: B
Answer: Microsporogenesis
Explanation: The process of formation of microspores from a pollen mother cell (PMC) through meiosis is called microsporogenesis.