name the following:
a. Collective term for sepals
b. Collective term for petals.
c. Male part of flower
d. Female part of a flower
Q2. Mentation the importance of:
a. Dispersal of fruits and seeds.
b. Seeds formation in plant.
Q3. Give an account of different kinds of plastids present in the plant cell
Q4. what are the main point of cell theory
Answers
Answer:
A1.
a. Calyx
b. Corolla
c. Stamens
d. Pistil
A2.
a. Fruit and Seed Dispersal. In addition to protecting the embryo, the fruit plays an important role in seed dispersal. Seeds contained within fruits need to be dispersed far from the mother plant so that they may find favorable and less-competitive conditions in which to germinate and grow.
b. Seeds provide a protective coat so that the embryo plant can develop when it finds a nice piece of soil. Seeds are a protective structure that lets a plant embryo survive for long periods of time before it germinates.
A3.
There are different types of plastids with their specialized functions. Among which few are mainly classified based on the presence or absence of the Biological pigments and their stages of development.
Chloroplasts
Chromoplasts
Gerontoplasts
Leucoplasts
Chloroplasts
Chloroplasts are biconvex shaped, semi-porous, double membraned, permeable cell organelle found within the mesophyll of the plant cell.They are the sites for synthesis food by the process of photosynthesis.
Also Refer: Chloroplasts
Chromoplasts
Chromoplasts is the name given to an area for all the pigments to be kept and synthesized in the plant. These can be usually found in flowering plants, aging leaves and fruits. Chloroplasts convert into chromoplasts. Chromoplasts are carotenoid pigments that allow different colours that you see in leaves and fruits. The main reason for its structure and the colour for attracting pollinators.
Gerontoplasts
These are basically chloroplasts that go with the aging process. Geronoplasts refers to the chloroplasts of the leaves that helps the beginning to convert into different other organelles when the leaf is no longer using photosynthesis usually in an autumn month.
Leucoplasts
These are the non-pigmented organelles which are colourless. Leucoplasts are usually found in most of the non-photosynthetic parts of the plant like roots. They act as a storage sheds for starches, lipids, and proteins depending on the needs of the plants. They are mostly used for converting amino acids and fatty acids.
A4.
The cell theory States three major points:-
1) The cell is the smallest unit of structure of all living things.
2) The cell is the unit of function of all living things.
3) All cells arise from pre-existing cells.
Answer:
Together, all of the petals of a flower are called corolla. Petals are usually accompanied by another set of special leaves like structures called sepals, that collectively form the calyx and lie just beneath the corolla.
As a plant's reproductive part, a flower contains a stamen (male flower part) or pistil (female flower part), or both, plus accessory parts such as sepals, petals, and nectar glands. The stamen is the male reproductive organs.