The MCQ Questions for Class 12 Biology with answers have been prepared based on the latest trends like syllabus and examination pattern suggested by CBSE, NCERT. Multiple Choice Questions for important part of Biology exams for Class 12. By Solving, these Class 12 MCQ Questions of Reproduction in Organisms with Answers students can check their preparation level for exams. 

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Practice MCQ Question for Class 12 Biology chapter-wise

1. Pollination by Bat is called :

(a) Omithorphily
(b) Entemophily
(c) Cheropterophily
(d) Hydrophily

2. Entemophily take place by

(a) By Bird
(b) By Bat
(c) By Wind
(d) By Insect

3. An example of rhizome is

(a) Garlic
(b) Colocassia
(c) Ginger
(d) Onion

 4. Budding is the example of :

(a) Vegetative reproduction
(b) Tissue culture
(c) Sexual production
(d) Dispersal

5. Asexual reproduction in Penicillium fungus usually takes place through?

(a) Budding
(b) Fission
(c) Conidia
(d) Gemmules

6. The reproduction takes place by gemma :

(a) In higher plants
(b) In lower animals
(c) In some bryophytes
(d) In mammals

7. The example of bulb is:

(a) Ginger
(b) Doob grass
(c) Onion
(d) Potato

8. The term scion is used in relation to :

(a) Embryology
(b) Sexual reproduction
(c) Pollen
(d) Grafting

9. Vegetative reproduction takes place in Agave:

(a) By bulbils
(b) By hybrid
(c) By stolon
(d) By rhizome

10. A human female reaches menopause around the age of:

(a) 70 years
(b) 50 years
(c) 25 years
(d) 15 years

11. The membranous cover of the ovum at ovulation is:

(a) Zona pellucida
(b) Zona radiata
(c) Corona radiata
(d) Chorion

12. Eye lens is formed from

(a) Ectoderm
(b) Mesoderm
(c) Endoderm
(d) Ectoderm and Mesoderm

13. Vegetative propagation in mint occurs by

(a) Sucker
(b) Rhizome
(c) Offset
(d) Runner

14. During regeneration, modification of an organ to other organ is known as

(a) Morphogenesis
(b) Epimorphosis
(c) Morphallaxis
(d) Accretionary growth

15. The menstrual cycle is completed in

(a) 28 days
(b) 31 days
(c) 27 days
(d) 30 days

16. Termination of gastrulation is indicated by

(a) Obliteration of blastocoel
(b) Obliteration of archenteron
(c) Closure of blastopore
(d) Closure of neural tube

17. Which of the following is developed by parthenogenesis:

(a) Drones
(b) Queen honey bee
(c) Worker honey bee
(d) Both (b) and (c)

18. Meroblastic cleavage refers to which type of division of egg?

(a) Complete
(b) Incomplete
(c) Horizontal
(d) Spiral

19. The female gametophyte in angiosperm is also known as.............

(a) Egg
(b) Embryo sac
(c) Carpel
(d) Ovule

20. Apomixis means.....

(a) Formation of seeds without fusion of gamete
(b) Sexual reproduction
(c) Formation of seedless fruit
(d) Vegetative propagation

21. In animals, the juvenile phase is followed by,

(a) reproductive phase
(b) senescent phase
(c) old age
(d) vegetative phase

22. External fertilisation occurs in majority of

(a) fungi
(b) liverworts
(c) algae
(d) mosses

23. Isogametes are seen in:

(a) Cladophora
(b) Fucus
(c) Human beings
(d) Ficus

24. Which animal has the longest gestation period?

(a) Shark
(b) Walrus
(c) Elephant
(d) Dog

25. Many mammals, especially in natural, wild conditions are:

(a) Continuous breeders
(b) Seasonal breeders
(c) Both continuous and seasonal breeders
(d) Very much disease sensitive

Answer:

1. Answer : (c) Cheropterophily

Explanation: The pollination of plants by bats is called chiropterophily. Plants pollinated by bats often have pale nocturnal flowers (in contrast, bees are mostly attracted to bright, daytime flowers).

2.  Answer : (d) By Insect

Explanation: Entomophily or insect pollination is a form of pollination whereby pollen of plants, especially but not only of flowering plants, is distributed by insects.

3. Answer : (c) Ginger

Explanation: Rhizomes are stems that help plants to reproduce asexually, survive in winter, store food, and make stem tubers. Examples of rhizomes include bamboos, ginger, turmeric, and others.

 4. Answer : (a) Vegetative reproduction

Explanation: Because new plants can grow from older plants using vegetative propagation methods such as grafting and budding. It is a form of asexual reproduction seen in plants. This process involves only a single plant and the offspring that arises is identical, both genetically and morphologically, to the parent plant.

5. Answer : (c) Conidia

Explanation: The fungi Penicillium reproduces by vegetative, asexual reproduction as well as sexual reproduction. In asexual reproduction, the process takes place by the formation of spores known as the conidiospores. The conidiospores that produce conidia are then expelled.

6. Answer : (c) In some bryophytes

Explanation: Asexual reproduction in bryophytes takes place by fragmentation or by the formation of gemma cups. Gemmae are green, multicellular, and asexual buds that are borne on the thalli of the parent. They are enclosed inside gemma cups. These gemmae fall off from the plant body and germinate to give rise to a new plant.

7. Answer : (c) Onion

Explanation:  An onion is a plant that grows as a bulb underground and can be harvested and eaten. Onions are bulbs, like tulips or daffodils — most of the plant is hidden in the soil, with roots stretching down and stalks that grow upward and eventually bloom with small flowers.

8. Answer : (d) Grafting

Explanation: Scion or grafting of a plant is a way of eliminating the twig or possible bud from the plant.

9. Answer : (a) By bulbils

Explanation: Vegetative reproduction in Agave occurs through bulbils. Bulbils are the specialized buds vegetative or floral that modify into a swollen structure. It separates from the parent plant and on the approach of the favorable condition gives rise to the new plant.

10. Answer : (b) 50 years

Explanation: Most women experience menopause around age 50, though it can occur before that age. The usual age range is 45 to 55.

11. Answer :   (c) Corona radiata

Explanation: The outermost membranous cover of the ovum at ovulation is corona radiata. It is formed by follicular cells.

12. Answer : (a) Ectoderm

Explanation: Unlike the rest of the eye, which is derived mostly from the neural ectoderm, the lens is derived from the surface ectoderm. The first stage of lens differentiation takes place when the optic vesicle, which is formed from out pocketing in the neural ectoderm, comes in proximity to the surface ectoderm.

13. Answer : (a) Sucker

Explanation: Sucker is a mode of vegetative propagation. Each sucker has nodes with scale leaf and axillary bud. For example, mint has the sucker.

14. Answer : (b) Epimorphosis

Explanation: Epimorphosis is the replacement of a lost organ of the body by proliferating new cells from the surface of the wound or injured part.

15. Answer : (a) 28 days

Explanation: For menstruating women, an average menstrual cycle lasts 28 days. It starts with the first day of the last period and ends with the first day of the next menstrual period.

16. Answer : (a) Obliteration of blastocoel

Explanation: This internal movement is referred to as invagination. Hence, the process of gastrulation ends with blastocoel cavity obliteration and three layers of germ formation.

17. Answer : (a) Drones

Explanation: Since drones are developed without fertilization of egg, they are developed by parthenogenesis. queen and worker honey bees are developed by fertilization of egg.

18. Answer : (b) Incomplete

Explanation: Meroblastic cleavage refers to an incomplete type of division of eggs. In such a cleavage, the furrows divide the small amount of active cytoplasm of animal pole or periphery of egg and most of the yolky portion of vegetal pole or central area of the egg remains undivided.

19. Answer : (b) Embryo sac

Explanation: The female gametophyte, also referred to as the embryo sac or megagametophyte, develops within the ovule, which, in turn, is embedded within the ovary of the carpel. Among angiosperms, the female gametophyte has a variety of forms.

20.  Answer :(a) Formation of seeds without fusion of gamete

Explanation: An apomixis is a form of asexual reproduction that occurs via seeds, in which embryos develop without fertilization.”

21. Answer : (a) reproductive phase

Explanation: In animals, the juvenile phase is followed by the reproductive phase.

22. Answer : (c) algae

Explanation: External Fertilization occurs in the majority of algae. External fertilization takes place mostly in wet environments and needs both the male and the female to release their gametes into their surroundings (usually water).

23. Answer : (a) Cladophora

Explanation: Isogametes are seen in algae like Spirogyra, Chlamydomonas, and a few more species.

24.  Answer : (c) Elephant

Explanation: The 22-month gestation period of the African elephant is the longest among the land mammals.

25. Answer : (b) Seasonal breeders

Explanation: Many mammals, especially those living in natural wild conditions exhibit reproductive cycles only during favourable seasons in their reproductive phase and are therefore called seasonal breeders. 

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