CBSE
PREVIOUS YEAR
QUESTION
Biology
sexual reproduction in flowering plants
2015 to 2025
, 5.An angiosperm embryo sac is located within the :
(A) Placenta
(B) Megasporangium
(C) Nucellus
(D) Ovary (2024)
6.Study the following diagram of Transverse Section of a young anther of an
angiosperm
Select the option where parts 'A', 'B' and 'C' are correctly identified.
(A) A - Connective, B - Endothecium, C - Pollen grain
(B) A - Endothecium, B - Connective, C - Pollen grain
(C) A - Pollen grain, B - Connective, C - Endothecium
(D) A - Endothecium, B - Pollen grain, C – Connective (2024)
VSA (1 mark)
7.Give an example of a plant which came into India as a contaminant and is a cause
of pollen allergy. (AI 2014)
8.Identify A, B, C and D in the table given below:
(2024)
SA I (2 marks)
9.(a) Explain the process of the development of a male gametophyte in an
angiosperm.
Document Na me
(b) Whyis itcalledamale gametophyte? (2023)
Your Company Name (C) Copyright (Print Date) All Rights Reserved 3
, 10.In the T.S. of a mature anther given below, identify "a" and " b " and mention
their functions.
(Al 2019)
11.A pollen grain in angiosperm at the time of dehiscence from an anther could be
2-celled or 3 -celled. Explain. How are the cells placed within the pollen grain when
shed at a 2-celled stage? (AI 2017)
12.Name the organic materials exine and intine of an angiosperm pollen grain are
made up of. Explain the role of exine. (Delhi 2014)
13.Draw a diagram of a matured microspore of an angiosperm. Label its cellular
components only. (Foreign 2014)
SA II (3 marks)
14.Draw a schematic transverse section of a mature anther of an angiosperm.
Label its epidermis, middle layers, tapetum, endothecium, sporogenous tissue
and the connective. (2020)
15.Where are the following structures present in a male gametophyte of an
angiosperm? Mention the function of each one of them.
(a) Germ pore
(b) Sporopollenin
(c) Generative cell (2019)
16.(a) Name the organic material exine of the pollen grain is made up of. How is
this material advantageous to pollen grain?
(b) Still it is observed that it does not form a continuous layer around the pollen
grain. Give reason.
(c) How are 'pollen banks' useful? (Al 2016)
17.Why are angiosperm anthers called dithecous? Describe the structure of its
microsporangium. (Al 2014)
4
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Your Company Name (C) Copyright (Print Date) All Rights Reserved
, LA (5 marks)
18.(a) Where does microsporogenesis occur in an angiosperm? Describe the
process of microsporogenesis.
(b) Draw a labeled diagram of the two celled male gametophyte of an angiosperm.
How is a three celled male gametophyte different from it? (2020)
19.Trace the development of a 2-celled pollen grain of an angiosperm within an
anther.
Draw a labeled diagram to substantiate your answer. (2020)
20.(a) Name the specific part in the anther and the process responsible for the
development of a male gametophyte in an angiosperm.
(b) Draw a labeled diagram of a mature male gametophyte (3-celled) of an
angiosperm. Write the functions of each labeled part. (2020C)
21.(a) Draw a labeled diagram of the sectional view of microsporangium of an
angiosperm.
(b) Explain the development of male gametophyte in the microsporangium.
(Delhi 2015C)
22.(a) Describe the sequence of the process of microsporogenesis in angiosperms.
(b) Draw a labeled diagram of a two celled final structure formed. (Delhi 2015C)
LA(5 Marks):
23.(a)(i): Explain the process of double fertilization in an angiosperm starting from
the germination of pollen grains on the stigma, mentioning the ploidy of the end
products formed at the end. State the role of synergids during the course of the
process.
(ii): Why does the development of endosperm precede that of the embryo?
(b)(i): Mention the site where fertilisation of the ovum occurs in a human female.
Explain the process of fertilization and mention how polyspermy is prevented.
(ii): Name the embryonic stage that gets implanted in the uterus. Explain the
process of implantation in a human female. (2024)
Pistil, Megasporangium and Embryo sac
MCQ
24.Figure (i) and figure
(ii) given below are showing two stages of megasporogenesis in a typical
angiosperm plant.
5
Document Name
Your Company Name (C) Copyright (Print Date) All Rights Reserved
PREVIOUS YEAR
QUESTION
Biology
sexual reproduction in flowering plants
2015 to 2025
, 5.An angiosperm embryo sac is located within the :
(A) Placenta
(B) Megasporangium
(C) Nucellus
(D) Ovary (2024)
6.Study the following diagram of Transverse Section of a young anther of an
angiosperm
Select the option where parts 'A', 'B' and 'C' are correctly identified.
(A) A - Connective, B - Endothecium, C - Pollen grain
(B) A - Endothecium, B - Connective, C - Pollen grain
(C) A - Pollen grain, B - Connective, C - Endothecium
(D) A - Endothecium, B - Pollen grain, C – Connective (2024)
VSA (1 mark)
7.Give an example of a plant which came into India as a contaminant and is a cause
of pollen allergy. (AI 2014)
8.Identify A, B, C and D in the table given below:
(2024)
SA I (2 marks)
9.(a) Explain the process of the development of a male gametophyte in an
angiosperm.
Document Na me
(b) Whyis itcalledamale gametophyte? (2023)
Your Company Name (C) Copyright (Print Date) All Rights Reserved 3
, 10.In the T.S. of a mature anther given below, identify "a" and " b " and mention
their functions.
(Al 2019)
11.A pollen grain in angiosperm at the time of dehiscence from an anther could be
2-celled or 3 -celled. Explain. How are the cells placed within the pollen grain when
shed at a 2-celled stage? (AI 2017)
12.Name the organic materials exine and intine of an angiosperm pollen grain are
made up of. Explain the role of exine. (Delhi 2014)
13.Draw a diagram of a matured microspore of an angiosperm. Label its cellular
components only. (Foreign 2014)
SA II (3 marks)
14.Draw a schematic transverse section of a mature anther of an angiosperm.
Label its epidermis, middle layers, tapetum, endothecium, sporogenous tissue
and the connective. (2020)
15.Where are the following structures present in a male gametophyte of an
angiosperm? Mention the function of each one of them.
(a) Germ pore
(b) Sporopollenin
(c) Generative cell (2019)
16.(a) Name the organic material exine of the pollen grain is made up of. How is
this material advantageous to pollen grain?
(b) Still it is observed that it does not form a continuous layer around the pollen
grain. Give reason.
(c) How are 'pollen banks' useful? (Al 2016)
17.Why are angiosperm anthers called dithecous? Describe the structure of its
microsporangium. (Al 2014)
4
Document Name
Your Company Name (C) Copyright (Print Date) All Rights Reserved
, LA (5 marks)
18.(a) Where does microsporogenesis occur in an angiosperm? Describe the
process of microsporogenesis.
(b) Draw a labeled diagram of the two celled male gametophyte of an angiosperm.
How is a three celled male gametophyte different from it? (2020)
19.Trace the development of a 2-celled pollen grain of an angiosperm within an
anther.
Draw a labeled diagram to substantiate your answer. (2020)
20.(a) Name the specific part in the anther and the process responsible for the
development of a male gametophyte in an angiosperm.
(b) Draw a labeled diagram of a mature male gametophyte (3-celled) of an
angiosperm. Write the functions of each labeled part. (2020C)
21.(a) Draw a labeled diagram of the sectional view of microsporangium of an
angiosperm.
(b) Explain the development of male gametophyte in the microsporangium.
(Delhi 2015C)
22.(a) Describe the sequence of the process of microsporogenesis in angiosperms.
(b) Draw a labeled diagram of a two celled final structure formed. (Delhi 2015C)
LA(5 Marks):
23.(a)(i): Explain the process of double fertilization in an angiosperm starting from
the germination of pollen grains on the stigma, mentioning the ploidy of the end
products formed at the end. State the role of synergids during the course of the
process.
(ii): Why does the development of endosperm precede that of the embryo?
(b)(i): Mention the site where fertilisation of the ovum occurs in a human female.
Explain the process of fertilization and mention how polyspermy is prevented.
(ii): Name the embryonic stage that gets implanted in the uterus. Explain the
process of implantation in a human female. (2024)
Pistil, Megasporangium and Embryo sac
MCQ
24.Figure (i) and figure
(ii) given below are showing two stages of megasporogenesis in a typical
angiosperm plant.
5
Document Name
Your Company Name (C) Copyright (Print Date) All Rights Reserved
