Reproduction in Organisms Test - 4

• A plant having both reproductive organs in the same plant is known as monoecious plant. It may also be known as homothallic conditions.
• Dioecious plants are those which have only one reproductive organ, also known as unisexual plants. Another word for dioecious plants is heterothallic .

Hence, the correct option is A.
NCERT Reference: Page no. 11 of topic “1.2.1 Pre-fertilisation Events ”of chapter 1.

• Bryophyllum plants grow in marshy areas where seeds are not able to germinate.
• While the leaves are still linked to the branch, the plants can propagate vegetatively.
• This plant 's leaves undergo mitosis and reproduce asexually in the form of plantlets that cover the edges of each leaf.
• When these plantlets mature, they fall off and grow into new plants when they come into contact with fertile soils.

Fig:  Bryophyllum pinnatum
Hence, the correct option is A.
NCERT Reference: Page no. 8 of topic “1.1 ASEXUAL REPRODUCTION ”of chapter 1.

• Gametogenesis refers to the formation of the gametes.
• In sexual reproduction formation of gametes is very important since offspring is formed only after the fusion of the gametes.
• Gamete transfer refers to bringing the 2 gametes together.

Hence, the correct option is A.

NCERT Reference: Page no. 10 of topic "1.2.1 Pre-fertilisation Events ”of chapter 1.

• In viviparous , since zygote development takes place inside the female body, they are in a protected environment.
• Unlike the oviparous animals, which are vulnerable. The chances of oviparous animals to survive is low.

Hence, the correct option is C.
NCERT Reference: Page no. 16 of topic “1.2.3 Post-fertilisation Events ”of chapter 1.

The period from birth to natural death of an organism is known as its life span . It varies from a few years to a thousand years, depending on the organism.
Hence, the correct option is C.
NCERT Reference: Page no. 3 of chapter 1.

• Life cycle of organism ’s starts from growth and development followed by the reproductive phase.
• After that senescence phase starts in which degenerative changes start which is generally irreversible and leads to death of organisms.

Hence, the correct option is C.
NCERT Reference: Page no. 10 of topic “1.2 SEXUAL REPRODUCTION ”of chapter 1.

• Ovaries develop into fruits which further develop a thick wall covering called the pericarp .
• The major function of the pericarp is protection. After fertilization all flower parts wither and fall off.

Hence, the correct option is D.

NCERT Reference: Page no. 16 of topic “1.2.3 Post-fertilisation Events “of chapter 1.

• Since drones are developed without fertilization of egg, they are developed by parthenogenesis.
• The male honey bees are called drones. Drones are produced through parthenogenesis , which occurs when an egg is not fertilised.
• Queen and worker honey bees are developed by fertilization of egg.

Fig : Parthenogenesis in Bees
Hence, the correct option is A.
NCERT Reference: Page no. 14 of topic “1.2.2 Fertilisation ”of chapter 1.

• The general term for the period of growth is known as juvenile phase.
• In plants it is known as the vegetative phase .
• The end of the juvenile phase marks the beginning of the reproductive phase.

Hence, the correct option is D.
NCERT Reference: Page no. 8 and 9 of topic “1.2 SEXUAL REPRODUCTION ”of chapter 1.

• Senescence is the loss of functional features in living organisms over time.
• The metabolic processes of organisms start slowing down in this process leading to wear and tear of vital body organs.
• Nutrition does not affect the process of senescence.

Hence, the correct option is C.
NCERT Reference: Page no. 10 of topic “1.2 SEXUAL REPRODUCTION ”of chapter 1.