Characteristics of life, plant reproduction

What process does the structure labelled D give rise to the structures labelled E?

• Meiosis

• Mitosis

• Binary Fission

• Fertilisation

Each pollen grain has a thick outer wall called the intine.

• True

• False

A time of low metabolic rate when growth does not occur, even though conditions for growth are present

(a)  

The remaining one of four haploid cells produced by the meiosis of the megaspore mother cell is called the (a)  

Dicotyledons have one embryonic seed leaf

• True

• False

Answer explanation

Dicotyledons have two embryonic seed leaves. Di means two

The walls of the ovule are known as the

• Integuments

• Testa

• Zygote

• Endosperm

Answer explanation

The integuments dry up to become the testa.

Pollen grains divide by mitosis to produce the tube nucleus and the ____________ nucleus

• Generative

• Female

• Male

Answer explanation

The generative nucleus produces the male gametes in the pollen tube of the flowering plant by dividing itself.

What term is used to describe organisms that do not have nuclei?

(a)  

Answer explanation

Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures, therefore do not contain a nucleus yet have a nucleoid.

The organelle involved in respiration

(a)  

Answer explanation

he mitochondrion functions to provide energy through respiration.

The (a)   is the control centre of the cell.

Answer explanation

The nucleus contains the DNA of the cell. It's structure is made up of a double membrane, a nucleolus and nuclear pores.