Sexual Reproduction in Flowering Plants

Q.

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Q. Write a note on androecium and gynoecium.

Q.

Draw a labelled diagram of the longitudinal section of a flower.

Q. Ploidy of endosperm will be ____ if the male and female parents are hexaploid and tetraploid respectively:

1. 8n
2. 7n
3. 16n
4. 10n

Q. Epipetalous is the condition of

1. Placentation
2. Stamens
3. Position of the ovary
4. Aestivation of the petals

Q.

What is microsporogenesis how can I define it

Q. Remnants of nucellus present in seed are called

1. Periderm
2. Endosperm
3. Perisperm
4. Pericarp

Q. List three strategies that a bisexual chasmogamous flower can evolve to prevent self pollination (autogamy).

Q. Read and select the correct option.
Statement 1: Unisexual flowers are either staminate or pistillate flowers.
Statement 2: Both monoecious and dioecious plants have unisexual flowers.

1. Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
   
2. Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
3. Statement 1 is correct and statement 2 is incorrect.
4. Both statements 1 and 2 are incorrect

Q.

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Q. How many nuclei take part in double fertilisation of flowering plants?

1. 3
2. 2
3. 5
4. 8

Q. In a typical complete, bisexual and hypogynous flower the arrangement of floral whorls on the thalamus from the outermost to the innermost is:

1. Calyx, corolla, gynoecium and androecium.
2. Gynoecium, androecium, corolla and calyx.
3. Androecium, gynoecium, corolla and calyx.
4. Calyx, corolla, androecium and gynoecium.

Q.

Is papaya a dioecious plant?

Q. In all of the following aquatic plants pollination occur by water current, except:

1. Vallisneria
2. Hydrilla
3. Zostera
4. Water lily

Q. Read the following statements and find out the incorre statement(s).
a. All flowering plants show sexual reproduction
b. Fruits and seeds are the end products of sexual reproduction
c. Rich colours, scents and perfumes of flowers aid in sexual reproduction
d. Flowers are objects of aesthetic, ornamental, social, religious and cultural values
e. Flowers have always been used as symbols for conveying important human feelings such as love, affection, happiness, grief, mourning, etc.

1. a, d and e

2. b, c and d

3. a, c and e

4. None of the above

Q. [5]
(a) Describe any two devices in a flowering plant which prevent both autogamy and geitonogamy.

(b) Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.

Q. Write two significant differences between superior and inferior ovary by giving suitable examples

Q.

What Is microsporogenesis?

Q. Which is a ‘rootless fern’?

1. Dryopteris
2. Salvinia
3. Pteris
4. Azolla

Q. Which of the following statements is/are correct for Euphorbia?
(i) Leaves modified into spines
(ii) Stem modified into leaf like organ
(iii) Cyathium inflorescence
(iv) Ratio of male and female flowers is one to many respectively

1. (i), (ii), (iii), (iv)
2. (ii), (i) and (iii)
3. Only (i)
4. Only (iii) and (iv)

Q. Identify the structures marked A to F in the given diagram.

1. A-Asymmetric nucleus, B-Nucleus, C-Generative cell, D-Vegetative cell, E-Pollen, F-Pollen tetrad
2. A- Pollen tetrad, B- Pollen, C-Generative cell, D-Vegetative cell, E-Asymmetric spindle, F-Nucleus
3. A-Pollen tetrad, B-Vacuole, C-Nucleus, D-Asymmetric spindle, E-Vegetative cell, F-Generative cell
4. A-Vacuole, B-Nucleus, C-Pollen tetrad, D-Vegetative cell, E-Asymmetric spindle, F-Generative cell

Q.

The stigma produces pollen grains.

1. True
2. False

Q. Write floral formula for a flower which, is bisexual; actinomorphic; pentamerous sepal, petal, stamens free with ovary, syncarpous, superior, trilocular with axile placentation.

Q.

What is the shape of the pollen grains?

Q. Fill in the blanks:
(e) Zygote is (diploid/haploid)

Q.

Do light and temperature affect flowering in plants?

Q. All the events from pollen deposition on the stigma until pollen tubes enter the ovules are together referred to as

Q.

What are the types of plants?

Q. Identify the flower parts A to E in the given diagram.

1. A- Thalamus, B- Gynoecium, C-Pedicel, D- Corolla, E - Caly
2. A- Androecium, B- Gynoecium, C-Corolla, D- Calyx, E - Pedicel
3. A- Gynoecium, B- Androecium, C-Corolla, D-Pedicel, E - Calyx
4. A- Perianth, B- Thalamus, C-Calyx, D- Corolla, E - Pedicel

Q. An aquatic plant which requires biotic pollinating agent is:

1. Water Lily
2. Hydrilla
3. Zostera
4. Vallisneria