Reproduction In Plants

Question 1

What is the base of a flower called ?

Answer 1

The receptacle

Question 2

What is the perianth of a plant composed of?

Answer 2

The sepal and petals

Question 3

What is the function of the sepal found in plant ?

Answer 3

Protective of the young flower bud

Question 4

Why are petals of a plant typically brightly colored?

Answer 4

Serve to attract insects to pollinate follower.

Question 5

State the name of male part of the plant and the parts found in it.

Answer 5

Stamen, anther and filament

Question 6

Where is pollen produced ?

Answer 6

In the anther

Question 7

Androecium

Question 8

What is the gynoecium ?

Answer 8

The female part of the flower that produces the female gametophyte within the ovules in ovaries.

Question 9

What does the carpel consist of?

Answer 9

Ovary with its ovules, style and stigma

Question 10

If both gametes are located on a plant it is said to be ________.

If a plant only had either male or female gamete are called __________.

Plants that have separated male and female gametes on the same plant is said to _________.

Answer 10

Hermaphrodite

Dioecious

Monoecious

Question 11

How are pollen grains formed ?

Answer 11

• Anthers have lobes with pollen sacs within the sacs they diploid mother cell.
• mother pollen cells are surrounded by a single layer of tapetum cells that transfer nutrients to developing pollen.
• The mother cells divide by meiosis to produce 4 pollen grains (microspore) and kept in groups of four afterwards.
• The grains separate and develop a thick two layered wall .

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Question 12

Draw and label the parts of a flower

Question 13

Define pollination

Answer 13

The transfer of pollen from the anther to the female stigma.

Question 14

What are ways that plants can be pollinated ?

Answer 14

By wind , insects , water or animal

Question 15

How may nuclei does plants have ?

Answer 15

7

Question 16

Steps in Fertilization

Answer 16

• Once the pollen grains reaches the stigma it germinates.
• A pollen tube emerges and travels through the style and once it reaches the ovule it grows through the micropyle.
• The tube degenerates and tip burst to release the male gametes
• One male gametes fuses with the female gamete forming a zygote while the other fuses with the polar nucleus to form the endosperm

Question 17

What are two types of pollination?

Answer 17

Cross pollination and self pollination

Question 18

Another name for flowering plants?

Answer 18

Angiosperm

Question 19

What are some factors that promote cross pollination ?

Answer 19

The factors which favour cross pollination are unisexuality, dichogamy, self sterility, mechanical and structural barrier and heterostyly.

Question 20

What are genetic consequence of self pollination?

Answer 20

Self-fertilization occurs in hermaphroditic organisms when the two gametes fused in fertilization come from the same individual.Although this is still sexual reproduction (because it incorporates meiosis and fertilization), it yields offspring that are lacking in genetic variation.

Question 21

How does dioecy promote cross pollination?

Answer 21

Dioecious plants only have a either male or female part therefore they are not able to self pollination therefore cross pollination is inevitable.

Question 22

How does self incompatibly/ sterility promote cross pollination?

Answer 22

Self-incompatibility is a condition where pollen is not able to fertilize the same flower or other flower.

some species, the pollen grains are non functional. Such condition is known as male sterility. It prevents self-pollination and promotes cross pollination.

Question 23

What is the purpose of the endosperm?

Answer 23

To provide nutrients to the developing embryo

Question 24

What develops into a seed coat ?

Answer 24

Integuments

Question 25

Draw and label the ovule

Question 26

A genetic consequences of cross pollination is

Answer 26

out-crossing—leads to greater genetic diversity because the microgametophyte and megagametophyte are derived from different plants.

Question 27

The ovule develops in the fruit

True or False?

Answer 27

False

Ovary

Question 28

How does seed develop from embryo sac?

Answer 28

The zygote ultimately divides to produce the mature embryo, the ovule develops into a seed, and the ovary.

Question 29

What is the functions of the fruit

Answer 29

Protect seeds during their maturation

Disperse mature seeds