Reproduction in Organisms VBQs Class 12 Biology

VBQs for Class 12

Very Short Answer Type Questions

Question. Identify ‘A’ in the given diagram and state its function. 

Reproduction in Organisms VBQs Class 12 Biology

Answer : ‘A’—Adventitious buds
Function — Vegetative propagation 

Question. Identify ‘A’ in the diagram and mention its function.

Reproduction in Organisms VBQs Class 12 Biology


Answer :
 ‘A’—Offset
Function — Vegetative propagation 

Question. Give an example each of a fungus which reproduces by :
(i) budding
(ii) conidia.
Answer :
 Budding : Yeast (Saccharomyces)
Conidia : Penicillium

Question. Name the vegetative propagules in the following :
(i) Agave
(ii) Bryophyllum 
Answer :
 (i) Agave : Bulbil
(ii) Bryophyllum : Leaf buds/adventitious buds 

Question. Which of the following statements is true for Yeast ?
(i) The cell divides by binary fission. One of them develops into a bud.
(ii) The cell divides unequally. The smaller cell develops into a bud.
(iii) The cell produces conidia, which develop into a bud.
Answer : (ii) The cell divides unequally. The smaller cell develops into a bud. 

Question. Which of the following statements is true for Hydra ?
(i) It produces asexual gemmules.
(ii) It produces unicellular bud.
(iii) It produces multicellular bud.
Answer : (iii) It produces multicellular bud. 

Question. Which of the following statements is true for ginger ?
(i) Germinating bud appears from the eye of the stem tuber.
(ii) Germinating bud appears from the node of the rhizome.
(iii) Germinating bud appears from the notch of the leaf margin.
Answer : (ii) Germinating bud appears from the node of the rhizome. 

Question. Name an organism where cell division in itself is a mode of reproduction.
Answer :
 Amoeba, a unicellular organism which reproduces asexually by binary fission. 

Question. Name the respective asexual reproductive structures of yeast and sponge.
Answer : 
Yeast : Bud (outgrowth of yeast cell)
Sponge : Gemmule.

Question. Offsprings derived by asexual reproduction are called clones. Justify giving two reasons.
Answer :
 As they are morphologically (structurally) similar, and genetically identical (exact replica of parental DNA). 

Question. Name the type of asexual reproduction where the parent cell ceases to exist.
Answer :
Fission / Binary fission / Longitudinal fission / multiple fission.

Question. Banana produces fruits but is propagated only by vegetative means. Why does is it so ?
Answer :
Seeds are not produced in banana. So, they are propagated only by vegetative methods. 

Short Answer Type Questions

Question. Banana fruit is said to be parthenocarpic whereas turkey is said to be parthenogenetic.
Why? 
Answer : Banana :
The fruit develops without fertilization from an unfertilized ovary. 
Turkey : The ovum/female gamete develop into a new chick without fertilization. 

Question. Which statement is true for Hydra ?
(i) It produces asexual gemmules.
(ii) It produces unicellular bud.
(iii) It produces multicellular bud.
Answer : 
Statement (iii) is correct. Hydra is a multicellular organism. It reproduces asexually by budding.
Hence,reread the options before answering.

Question. Banana crop is cultivated by farmers without sowing of seeds. Explain how the plant is propagated ?
Answer :
In banana, the seeds are not produced because the fruits are parthenocarpic. Therefore these plants are propagated vegetatively with the help of horizontally growing underground rhizome which is a modified underground stem. The axillary buds present at the nodes of the rhizome gives rise to new plants of banana.