Sexual Reproduction in Plants

Q.

Cleistogamous flowers are invariably autogenous as there is no chance of cross pollen landing on the stigma. Justify the statement

Q.

Write the floral formula of an actinomorphic bisexual, hypogynous flower with five united sepals, five free petals. Five free stamens and two united carpals with superior ovary and axile placentation.

Q. Are you aware how plants like potato, sugarcane, banana, ginger, Dahlia are cultivated?

Q. How sexual reproduction helps the organisms to survive during unfavorable conditions? Why is sexual reproduction favoured under such conditions?

Q.

The organism develops from a female gamete/egg without fertilization

1. Polyembryony

2. Adventive embryony

3. Parthenogenesis

4. Parthenocarpy

Q.

Choose the correct statement.

1. In all organisms male gametes are motile and female gametes are stationary.

2. In bryophytes and pteridophytes fertilisation occurs in presence of water.

3. In spermatophytes pollen grains acts as sperm carriers.

4. The number of male gametes produced are several thousand times to female gametes in most organisms.

Q. Which of the following plant has a superior ovary?

1. Peach
2. Chinarose
3. Guava
4. Rose

Q. Second polar body during oogenesis is formed:

1. At the time of copulation
2. Before ovulation, within tertiary follicle
3. When sperm enters in secondary oocyte during fertilization
4. After zygote formation

Q. Flower with a feathery and sticky stigma, light pollen grains and reduced petals are features of:

1. Moth pollinated flowers
2. Bird pollinated flowers
3. Bee pollinated flowers

4. Wind pollinated flowers

Q.

Read the following statements and find out the incorrect statement(s).

a.Mustard has hypogynous, actinomorphic flower, parietal placentation, syncarpous gynoecium and belongs to family Brassicaceae.

b.China rose has superior ovary, twisted aestivation, monadelphous stamens and axile placentation.

c. Pea has bilateral symmetry, vexillary aestivation, diadelphous stamens, marginal placentation and belongs to family Fabaceae.

d. Chilli has radial symmetry, epipetalous stamen, swollen placenta, monocarpellary gynoecium and belongs to family Solanaceae.

e. Lily has actinomorphic flower, axile placentation, imbricate aestivation, tricarpellary and trilocular gynoecium belonging to family Liliaceae.

1. 1
2. 2
3. 3
4. 4

Q. A plant that flowers only once in 12 years, found in hilly areas in Kerala, Karnataka and Tamil Nadu and attracts a large number of tourists is ____________.

1. Strobilanthus kunthiana
2. Bambusa vulgaris
3. both b and c
4. water hyacinth

Q.

What is valvate aestivation?

Q. Which are the reproductive organs in Bryophytes?

1. Antheridium
2. Archegonium
3. Androecium
4. Gynoecium

Q. In coconut, which layer of fruit is fibrous?

1. Epicarp
2. Mesocarp
3. Endocarp
4. None of the above

Q. How many plants in the list given below are polycarpic?
Wheat, Rice, Maize, Bamboo, Mango, Litchi, Guava, Lemon, Oranges.

1. 6
2. 3
3. 4
4. 5

Q.

When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called

1. Transformation

2. Heterosis

3. Metamorphosis

4. Splicing

Q. Select the mismatched pair :-

1. Microsporangium – Pollen sac
2. Pollen grain – Male gamete
3. Embryo sac – Female gametophyte
4. Megasporangium - Nucellus

Q.

Unisexual flowers are present on the same plant in

1. Date palm

2. Papaya

3. Commelina

4. Coconut

Q. Seeds of angiosperms are often called the products of sexual reproduction because, these

1. Embryo sac
2. Seed
3. Ovule
4. PEN

Q. What is spadix, corymb catkin spike inflorescence?

Q. Read the following statements and select the correct option.

Statement 1 : Many plants are propagated vegetatively even though they bear seeds.
Statement 2 : Sweet potatoes multiply vegetatively by root tubers.

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.

Water is not required for the movement of male gametes in seed plants.

1. True

2. False

Q. "Families are characterised on the basis of both vegetative and reproductive features of plant species." What is the meaning of this statement?

Q. Do all trees flower during the same month year after year?

Q. Hermaphrodite flowers have

1. only male reproductive parts
2. male and female reproductive parts in the same flower
3. only female reproductive parts
4. none of the reproductive parts

Q. The following figure shows

1. Bisexual flower of sweet potato
2. Monoecious flower of potato
3. Unisexual flower of sweet potato
4. Dioecious flower of sweet potato

Q. The ovary is half inferior in

1. Sunflower
2. Plum
3. Brinjal
4. Mustard

Q. The adventitious embryo in Citrus is formed from

1. nucellus
2. egg apparatus
3. zygotic embryo
4. fertilized egg

Q.

Choose the correct statement.

1. In all organisms male gametes are motile and female gametes are stationary.

2. In bryophytes and pteridophytes fertilisation occurs in presence of water.

3. In spermatophytes pollen grains acts as sperm carriers.

4. The number of male gametes produced are several thousand times to female gametes in most organisms.

Q. Fertilization are of different types based on the route of entry of the pollen tube. Choose the correct option according to the following figure.

1. A- Mesogamy, B- Chalazogamy, C- Porogamy.
2. A- Porogamy, B- Chalazogamy, C- Mesogamy.
3. A- Porogamy, B- Mesogamy, C- Chalazogamy.
4. A- Chalazogamy, B- Mesogamy, C- Porogamy.