Maharashtra Board Class 7 Science Solution Chapter 2 – Plants Structure and Function
Balbharati Maharashtra Board Class 7 Science Solution Chapter 2: Plants Structure and Function. Marathi or English Medium Students of Class 7 get here Plants Structure and Function full Exercise Solution.
Std |
Maharashtra Class 7 |
Subject |
General Science Solution |
Chapter |
Plants Structure and Function |
EXERCISE Solution PLANTS: STRUCTURE AND FUNCTION
(1) GIVE EXAMPLES OF 3 PLANTS THAT HAVE:-
a) Spiny fruits:- Custard apple, Jackfruit.
b) Spiny stem:- Cactus and aloe vera.
c) Red flowers:- Rose and Hibiscus.
d) Yellow flowers:- Sunflower and marigold.
e) Leaves which close at night:- Acacia and albizia.
f) Single seeded fruits:- Mango, Cherries.
g) many seeded fruits:- Apple, Watermelon
(2.) OBSERVE ANY ONE FLOWER AND ITS VARIOUS PARTS AND DESCRIBE IT IN YOUR OWN WORDS:-
ANS:- Flowers have a long or a short stalk called pedicel. One end of the pedicel is expanded and swollen. It is called the receptacle. Calyx, corolla, gynoecium, are different parts of a flower.
CALYX:- In the bud condition the petals are covered by leaf like parts called sepals that are green in colour. They form the calyx.
COROLLA:- This is made up of colourful parts called petals. Observe the shape, colour and smell of the corolla of various flowers like rose, hibiscous, tagar etc.
ANDROECIUM:- This is the male reproductive part of the flower. It consists of stamens. Each stamen is made up of another and filament.
GYNOECIUM:- This is the female reproductive part of the flower. This ios made up of carpels. A carpel consists of stigma, style, and ovary.
Style:- It connects stigma to ovary.
Stigma:- It acts as a receptacle for the pollen grains.
Ovary:- It is the enlarged basal part on which style lies.
(3.) what are the similarities and differences between?
a) JOWAR AND MOONG:- Jowar is a type of monocot plant and moong is a type of dicot plant. 2.Jowar has a fibrous root system and Moong has tap root system.
b) ONION AND CORIANDER:- 1. Onion is a type of monocot plant and Coriander is a type of dicot plant.
2. Onion is a type of vegetable and Coriander is a type of herb.
LEAVES OF BANANA AND MANGO:- 1. The leaves of banana are long in size and the leaves of mango are short bin size.
2. Banana has a parallel venation and Mango has a reticulate venation.
d) COCONUT TREE AND JOWAR STALK PLANT:- Leaves of coconut trees are arranged spirally and leaves of jowar stalk plants are arranged in opposite manner.
The height of coconut tree upto 23 meters and the height of the jowar stalk plant upto 3 meter.
(4.) Explain the following images in your own words.
Image A represents a cross section of a seed. The seed consists of seed coat, and an embryo. A seed coat is hard in nature and embryo is thick and swollen.
And image B represents a monocot and a dicot seed.
(5.) DESCRIBE THE FUNCTIONS OF VARIOUS PARTS OF A PLANT.
ANS:- The different parts of a plants are-
1.) Calyx. 2.) Corolla. 3.) Androecium. 4.) Gynoecium.
CALYX:- In the bud condition the petals are covered by leaf-like parts called sepals which are green in colour. They form the calyx.
COROLLA:- This is made up of colourful parts covered by leaf like parts called sepals. Observe the shape , colour and the smell of the corolla of various flowers like the rose, hibiscus, mogara, kankher, tagar etc.
ANDROECIUM:- This is the male reproductive part of a plant. It consists vof stamens. Each stamen is made up of another and filament.
GYNOECIUM:- This is the female reproductive part of a flower of a plant. This is made up of carpels. A carpel is consists of stigma, style, ovary.
Style:- It connects stigma to ovary.
Stigma:- It acts as a receptacle for the pollen grains.
Ovary:- It is the enlarged basal part on which style lies.
(6.) Certain properties are mentioned below. Find a leaf corresponding to each property and describe those plants. leaves with smooth surface, leaves with rough surface, fleshy leaf, spines on leaf.
1.) LEAVES WITH SMOOTH SURFACE:- The simple smooth edged leaves are 2 to 4 m long. The upper portion is green. E.g- Salix caroliniana.
2.) LEAVES WITH ROUGH SURFACE:- It is belonged to the category of shrubs. E.g- Asperiifolia.
3.) FLESHY LEAF:- Fleshy leaf are found in desert areas. Their leaves are green. Eg- opuntia.
4.) SPINES ON LEAF:- Many plants have spices on their leaves. E.g- Acacia, aloe vera
(7.) Find the plant parts.
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O | w | p | y | e | T | a | 1 |
O | 1 | 1 | d | n | E | D | o |
T | A | o | i | 1 | m | I | w |
C | N | e | t | a | 1 | c | e |
A | V | O | v | u | M | l | r |
P | E | T | a | 1 | S | e | o |
r | O | o | t | h | a | i | r |
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