today revision

Question 1

an atom is

Answer 1

The smallest part of an element that can exist.

Question 2

a compound is

Answer 2

A substance formed by the chemical union of two or more elements. For example, water is a compound of hydrogen and oxygen. Each of its molecules contains two hydrogen atoms and one oxygen atom. There are very many different compounds.

Question 3

a element is

Answer 3

A substance made of one type of atom only. For example, lead and gold are elements. A piece of pure gold contains only gold atoms. A piece of pure lead contains only lead atoms.

Question 4

a molecule is

Answer 4

A collection of two or more atoms held together by chemical bonds. for example Carbon dioxide - CO2

Question 5

pollination is

Answer 5

The fertilisation of flowers by passing on their pollen.

Question 6

fertilisation is

Answer 6

The joining of a male and female gamete.

Question 7

photosynthesis equation is

Answer 7

carbon dioxide + water (+ light energy) → glucose + oxygen

Question 8

Anthers are

Answer 8

Produce male sex cells (pollen grains)

Question 9

Ovary are

Answer 9

Produces the female sex cells (contained in the ovules)

Question 10

competition are

Answer 10

The interaction between organisms after the same limited resources.

Question 11

self pollination is

Answer 11

pollen is transferred from the stamen to stigma on the same plant

Question 12

cross pollination is

Answer 12

pollen is transferred from the stamen of one plant to the stigma of a different plant

Question 13

stamens are

Answer 13

the stamen are the male part of the flower.they consist of the anther and the filament.the anther contains pollen grains, which produce the male sex cells.
the filament supports the anther

Question 14

carpets are

Answer 14

the female parts of the flower.they consist of the stigma style and ovary.the ovary contains the female sex cells inside the ovules

Question 15

the four things you need for photosynthesis

Answer 15

Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight.This process is called photosynthesis.During the process of photosynthesis, plants release oxygen into the air.People and animals need oxygen to breathe.

Question 16

insect pollination

Answer 16

the insect pollination is brightly covered petals and also scented flowers with nectaries.

stick stigma to take the pollen off the insect as it goes from plant to plant to feed in the nectries.

Question 17

wind pollination is

Answer 17

the features of plants that use wind pollination is.

it is usually small dull petals on the flower.

no scent or nectaries.

it has a long filament hang the anthers outside the flower so a lot of pollen is blown away.

also stigmas are feathery to catch pollen as it carried past in the wind

Question 18

Where is pollen produced?

Answer 18

Stamen: The pollen producing part of a flower, usually with a slender filament supporting the anther.

Anther: The part of the stamen where pollen is produced.

Pistil: The ovule producing part of a flower.

The ovary often supports a long style, topped by a stigma.

Question 19

Where does fertilisation occur?

Answer 19

In humans fertilization occurs in the end of the fallopian tube away from the uterus (close to the ovary).

The egg and the associated cumulus cells are ovulated (released) from an ovarian follicle and picked up by the fallopian tube.

The tube pulls it inside where the sperm can find it.

Question 20

Which part of the flower develops into the fruit?

Answer 20

Ovary: female reproductive structure of flower that usually develops into the fruit.

Pericarp: fruit tissues surrounding the seeds that are derived from the ovary.

Ovule: egg-bearing structure of the flower that develops into a seed.