Botany-Reproduction in Organisms - Online Test
Q1. The degenerative and irreversible changes in the organism is known as
Answer : Option A
Explaination / Solution:
life cycle of organism’s starts from growth and development followed by reproductive phase. After that senescence phase starts in which degenerative changes starts which is generally irreversible and leads to death of organisms.
Q2. In diploid organism, gametes are produced by meiosis division but in haploid organism gametes are produced by
Answer : Option B
Explaination / Solution:
During mitosis division two daughter cells are produced having same number of chromosome. In meiosis division four daughter cells having half the number of chromosomes are produced. So, haploid organisms follow mitosis division.
Q3. Parthenogenesis is the development of unfertilized ovum into a fully formed haploid organism. Natural parthenogenesis is found in
Answer : Option C
Explaination / Solution:
Development of individual from unfertilized ovum is called parthenogenesis. The individual is haploid as no fusion of gametes occurs. Honey bee is of three kinds namely queen, drone and worker. Workers are produced parthenogenetically.
Q4. Apomixis means
Answer : Option D
Explaination / Solution:
Apomixis is modified form of reproduction in plants in which seeds are formed without fusion of gametes. The diploid cell of nucellus develops into an embryo giving a diploid seeds.
Q5. Flagellated, motile asexual reproductive structure are called
Answer : Option A
Explaination / Solution:
A number of simple organism produce single or multi-flagellated spores called zoospores. Water is essential for this mode of reproduction. Aplanospores are non-flagellated spores.
Q6.
Identify the figure given below:-
Answer : Option A
Explaination / Solution:
Rhizome of ginger is modified root, located inside the soil parallel to earth surface. Vegetative propagation of ginger is done with it.
Q7. Water hyacinth is called as terror of Bengal due to
Answer : Option C
Explaination / Solution:
Water hyacinth is water weeds which grows very fast and covers the whole ponds in few days. Weeds absorb oxygen from the water and make it oxygen deficient that kills the fish in ponds along with other aquatic organisms.
Q8. In bacteria asexual reproduction takes palace by
Answer : Option A
Explaination / Solution:
In bacteria, asexual reproduction occurs by endospore formation in favorable condition. In unfavorable condition, bacteria produce sexually or change into cyst.
Q9. Stem cutting is used in the propagation of
Answer : Option C
Explaination / Solution:
Stem cutting is a mode of vegetative propagation in which stem is cut into pieces having at least one node. From the node new plantlet emerge out. Mango and cotton are grown by seeds and Banana by root cutting.
Q10. Vegetatively propagated plants are generally
Answer : Option C
Explaination / Solution:
In vegetative propagation is the asexual mode of reproduction in which plants parts are used to grow new plants. Since fusion of gametes is not involved in the process all individual produced vegetatively are genetically similar.
