Question

Question 9 Differentiate between the following:-

(i)red algae and brown algae

(ii) liverworts and moss

(iii) homosporous and heterosporous pteridophyte

(iv) syngamy and triple fusion

Class XI Biology Chapter - Plant Kingdom Page 45

Answer 1

) Red algae and brown algae
Red algae
Brown algae
1.
Red algae are grouped under the class Rhodophyceae.
1.
Brown algae are grouped under the class Phaeophyceae.
2.
They contain floridean starch as stored food.
2.
They contain mannitol or laminarin as stored food.
3.
They contain the photosynthetic pigments chlorophylls a and d, and phycoerythrin.


3.
They contain the photosynthetic pigments chlorophylls a and c, and fucoxanthin.
4.
Their cell walls are composed of cellulose, pectin, and phycocolloids.
4.
Their cell walls are composed of cellulose and algin.
5.
Flagella are absent
5.
Two flagella are present

(ii) Liverworts and moss
Liverworts
Moss
1.
They have unicellular rhizoids.
1.
They have multicellular rhizoids.
2.
Scales are present very often
2.
Scales are absent
3.
They are generally thalloid, with dichotomous branching.
3.
They are foliage, with lateral branching.
4.
Gemma cups are present
4.
Gemma cups are absent
5.
Sporophyte has very little photosynthetic tissue
5.
Sporophyte has abundant photosynthetic tissue

(iii) Homosporous and heterosporous pteridophyte
Homosporous pteridophytes
Heterosporous pteridophytes
1.
They bear spores that are of the same type.
1.
They bear two kinds of spores – microspores and megaspores.
2.
They produce bisexual gametophytes.
2.
They produce unisexual gametophytes.

(iv) Syngamy and triple fusion
Syngamy
Triple fusion
1.
It is the process of fusion of the male gamete with the egg in an angiosperm.
1.
It is the process of fusion of the male gamete with the diploid secondary nucleus in an angiosperm.
2.
A diploid zygote is formed as a result of syngamy.
2.
A triploid primary endosperm is formed as a result of triple fusion.

Answer 2

Characteristics of Plant

Explanation:

Differentiate between Red  algae and Brown alga e

• Red algae square measure sorted underneath the category class. Brown alga e measure sorted underneath the category class.
• They contain floridean starch as keep food. They contain diuretic drug or laminarin as keep food.

Differentiate between liverworts and nonvascular plant

• nonvascular plant measure with a distinguished plant.
• The plant isn't differentiated into root, stem or leaves. Liverworts square measure thallose or foliaceous plants whereas mosses square measure foliaceous plants. the most distinction between liverworts and mosses is that the morphology of the plant in every plant.

Differentiate between homosporous and heterosporous pteridophyte

• The monogenesis pteridophytes turn out only 1 form of spores whereas the monogenesis pteridophytes turn out 2 styles of spores  megaspores and microspores

Differentiate between syngamy and triple fusion

• Syngamy is gametic fusion between the male sex cell and therefore the egg leading to the formation of fertilized ovum whereas triple fusion is that the gametic fusion of 1 male sex cell with the diploid secondary nucleus leading to the formation of the polyploid nucleus.
• In syngamy the fertilized ovum that develops to the embryo whereas within the triple.