(b) Differentiate between the following pairs on the basis of what is given in brackets:
(i) Calyx and corolla (representatives)
(ii) Nucleus and nucleolus (differences)
(iii)Dicots and monocots (presence of seed leaves)
(iv) Reticulate venation and parallel venation .(present in)
(v) Androecium and Gyonecium ( what sexes are they)
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Answer with explanation:
i) Calyx and Corolla —
Calyx–
- The calyx is the collection of sepals of a flower.
- Calyx protects the inner whorls of the flower in the bud stage.
Corolla –
- Corolla is the collection of petals of a flower.
- Corolla protects the reproductive organs and helps in pollination by attracting pollinators.
ii) Nucleus and Nucleolus —
Nucleus –
- Large in size
- Bound by the nuclear envelope
- It contains chromosomes.
- It is rich in DNA, the genetic material
Nucleolus –
- Very small in size
- It has no limiting membrane
- It has no limiting membraneIt does not hold any chromosomes.
- It is rich in RNA
iii) Dicot and Monocot Seeds —
Dicot Seed –
- Dicot seeds are defined as seeds that consist of two embryonic leaves or cotyledons.
- Dicot seeds have two distinct cotyledons.
Monocot Seed –
- Monocot seeds are defined as seeds that consist of a single (mono) embryonic leaf or cotyledon.
- Monocot seeds have a single cotyledon.
iv) Reticulate Venation and Parallel Venation —
Reticulate Venation –
- Present in dicot plants.
- Two Examples are ; mango and hibiscus
Parallel Venation –
- Present in Monocot plants.
- Two Examples are; banana and bamboo .
v) Androecium and Gynoecium —
The gynoecium (female) and androecium (male) parts of the plant are floral organs that house the sporophyte-dependent gametophytes.
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