1. Among the terms listed below, those that of are not technically correct names for a floral whorl are
(i) androecium
(ii) carpel
(iii) corolla
(iv) sepal
2. Embryo sac is to ovule as ……… is to an anther.
(a) stamen
(b) filament
(c) pollen grain
(d) androecium
3. In a typical complete, bisexual and hypogynous flower the arrangement of floral whorls on the thalamus from the outermost to the innermost is
(a) calyx, corolla, androecium, and gynoecium
(b) calyx, corolla, gynoecium, and androecium
(c) gynoecium, androecium, corolla, and calyx
(d) androecium, gynoecium, corolla, and calyx
4. A dicotyledonous plant bears flowers, but never produces fruits and seeds. The most probable cause for the above situation is
(a) plant is dioecious and bears only pistillate flowers
(b) plant is dioecious and bears both pistillate and staminate flowers
(c) plant is monoecious
(d) plant is dioecious and bears only staminate flowers
5. The outermost and innermost wall layers of the microsporangium in an anther are respectively.
(a) Endothecium and tapetum
(b) Epidermis and endodermis
(c) Epidermis and middle layer
(d) Epidermis and tapetum
6. During microsporogenesis, meiosis occurs in
(a) endothecium
(b) microspore mother cells
(c) microspore tetrads
(d) pollen grains
7. From among the sets of terms given below, identify those that are associated with the gynoecium.
(a) Stigma, ovule, embryo sac, placenta
(b) Thalamus, pistil, style, ovule
(c) Ovule, ovary, embryo sac, tapetum
(d) Ovule, stamen, ovary, embryo sac
8. Starting from the innermost part, the correct sequence of parts in an ovule are
(a) egg, nucellus, embryo sac, integument
(b) egg, embryo sac, nucellus, integument
(c) embryo sac, nucellus, integument, egg
(d) egg, integument, embryo sac, nucellus
9. From the statements given below, choose the options that are true for a typical female gametophyte of.
(i) It is eight-nucleate and seven-celled at maturity.
(ii) It is free-nuclear during development.
(iii) It is situated inside the integument, but outside the nucleus.
(iv) It has an egg apparatus situated at the chalazal end.
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (ii) and (iv)
10. Autogamy can occur in a chasmogamous flower if
(a) pollen matures before maturity of ovule
(b) ovules mature before maturity of pollen
(c) both pollen and ovules mature simultaneously
(d) both anther and stigma are of equal length
11. Choose the correct statement from the following.
(a) Cleistogamous flowers always exhibit autogamy.
(b) Chasmogamous flowers always exhibit geitonogamy.
(c) Cleistogamous flowers exhibit both autogamy and geitonogamy.
(d) Chasmogamous flowers never exhibit autogamy.
12. A particular species of plant produces light, non-sticky pollen in large numbers, and its stigmas are long and feathery. These modifications facilitate pollination by
(a) insects
(b) water
(c) wind
(d) animals
13. From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
(a) Monoecious plant bearing unisexual flowers.
(b) Dioecious plant bearing only male or female flowers.
(c) Monoecious plant with bisexual flowers.
(d) Dioecious plant with bisexual flowers.
14. In a fertilised embryo sac, the haploid, diploid and triploid structure are
(a) synergid, zygote, and primary endosperm nucleus
(b) synergid, antipodal, and polar nuclei
(c) antipodal, synergid, and primary endosperm nucleus
(d) synergid, polar nuclei, and zygote
15. In an embryo sac, the cells that degenerate after fertilisation are
(a) synergids and primary endosperm cell
(b) synergids and antipodals
(c) antipodals and primary endosperm cell
(d) egg and antipodals
16. While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant?
(a) Bagging of female flower
(b) Dusting of pollen on stigma
(c) Emasculation
(d) Collection of pollen
17. In the embryos of a typical dicot and a grass, true homologous structures are
(a) coleorhiza and coleoptile
(b) coleoptile and scutellum
(c) cotyledons and scutellum
(d) hypocotyl and radicle
18. The phenomenon observed in some plants where in parts of the sexual apparatus is used for forming embryos without fertilisation is called
(a) parthenocarpy
(b) apomixis
(c) vegetative propagation
(d) sexual reproduction
19. In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be
(a) haploid
(b) diploid
(c) a few haploid and a few diploid
(d) with varying ploidy
20. The phenomenon wherein the ovary develops into a fruit without fertilisation is called
(a) parthenocarpy
(b) apomixis
(c) asexual reproduction
(d) sexual reproduction
1. Name the component cells of the ‘egg-apparatus’ in an embryo sac.
2. Name the part of gynoecium that determines the compatible nature of pollen grain.
3. Name the common function that cotyledons and nucellus perform.
4. Complete the following flow chart
5. Indicate the stages where meiosis and mitosis occur (1, 2 or 3) in the flow chart.
6. In the diagram given below, show the path of a pollen tube from the pollen on the stigma into the embryo sac. Name the components of egg apparatus.
7. Name the parts of pistil which develop into fruit and seeds.
8. In case of polyembryony, if an embryo develops from the synergid and another from the nucellus which is haploid and which is diploid?
9. Can an unfertilised, apomictic embryo sac give rise to a diploid embryo? If yes, then how?
10. Which are the three cells found in a pollen grain when it is shed at the three-celled stage?
11. What is self-incompatibility?
12. Name the type of pollination in self-incompatible plants.
13. Draw the diagram of a mature embryo sac and show its eight-nucleate, seven-celled nature. Show the following parts-antipodals, synergids, egg, central cell, polar nuclei.
14. Which is the triploid tissue in a fertilised ovule? How is the triploid condition achieved?
15. Are pollination and fertilisation necessary in apomixis? Give reasons.
16. Identify the type of carpel with the help of diagrams given below Carpels
17. How is pollination carried out in water plants?
18 What is the function of the two male gametes produced by each pollen grain in angiosperms?
1. List three strategies that a bisexual chasmogamous flower can evolve to prevent self-pollination (autogamy).
2. Given below are the events that are observed in an artificial hybridisation programme. Arrange them in the correct sequential order in which they are followed in the hybridisation programme: (a) Re-bagging, (b) Selection of parents (c) Bagging, (d) Dusting the pollen on stigma, (e) Emasculation, (f) Collection of pollen from male parent.
3. Vivipary automatically limits the number of offspring in a litter. How?
4. Does self-incompatibility impose any restrictions on autogamy? Give reasons and suggest the method of pollination in such plants.
5. In the given diagram, write the names of parts shown with lines.
6. What is polyembryony, and how can it be commercially exploited?
7. Are parthenocarpy and apomixis different phenomena? Discuss their benefits.
8. Why does the zygote begin to divide only after the division of Primary Endosperm Cell (PEC)?
9. The generative cell of a two-celled pollen divides in the pollen tube, but not in a three-celled pollen. Give reasons.
10. In the figure given below label the following parts-male gametes, egg cell, polar nuclei, synergid, and pollen tube
1. Starting with the zygote, draw the diagrams of the different stages of embryo development in a dicot.
2. What are the possible types of pollinations in chasmogamous flowers? Give reasons.
3. With a neat, labelled diagram, describe the parts of a mature angiosperm embryo sac. Mention the role of synergids.
4. Draw the diagram of a microsporangium and label its wall layers. Write briefly about the wall layers.
5. Embryo sacs of some apomictic species appear normal, but contain diploid cells. Suggest a suitable explanation for the condition.
Download the CBSE Class 12 Biology Chapter 1 Exemplar Solutions PDF.
NIOS Biology Question Paper 2019 Oct Set C 1 MARK QUESTIONS 1. Which of the…
NIOS Class 10 Science Chapter 8 Question Answers INTEXT QUESTION 8.1 1. Put the following…
NIOS Biology Solved Paper Oct 2021 Set C 1 MARK QUESTIONS 1. Bt. crops are:…
NIOS Class 10 Science Chapter 7 Question Answers INTEXT QUESTIONS 7.1 1. State the octet…
NIOS Biology Solved Paper Feb 2021 Set C 1 MARK QUESTIONS 1. Apomixis is: A)…
NIOS Class 10 Science Chapter 6 Question Answers INTEXT QUESTIONS 6.1 1. Elements A, B…
This website uses cookies.
View Comments
Hurrah! Finally I got a web site from where I be able to
in fact obtain useful information regarding my study and knowledge.