Question 1

Q1: How is a pinnately compound leaf different from a palmately compound leaf?

Accepted Answer

Question 2

Q10: Describe the arrangement of floral members in relation to their insertion on thalamus.

Accepted Answer

Based on the position of the calyx, corolla, and androecium in respect to the ovary on the thalamus, flowers are described as hypogynous, perigynous, and epigynous. 1.  Hypogynous Flower:        In a hypogynous flower, the gynoecium occupies the highest position on the thalamus, while the other flor...

Question 3

Q2: Explain with suitable examples the different types of phyllotaxy.

Accepted Answer

Phyllotaxy is the pattern of arrangement of leaves on the stem or a branch. There are three main types of phyllotaxy: 1.  Alternate Phyllotaxy: In this type, a single leaf arises at each node in an alternate manner. This arrangement prevents the shading of lower leaves and allows maximum exposure to...

Question 4

Q3: Define the following terms: (a) aestivation (b) placentation (c) actinomorphic (d) zygomorphic (e) superior ovary (f) perigynous flower (g) epipetalou...

Accepted Answer

(a) Aestivation: The mode of arrangement of sepals or petals in a floral bud with respect to the other members of the same whorl is known as aestivation. (b) Placentation: The arrangement of ovules within the ovary is known as placentation. The placenta is the cushion-like tissue to which the ovules...

Question 5

Q4: Differentiate between (a) Racemose and cymose inflorescence (b) Apocarpous and syncarpous ovary

Accepted Answer

Question 6

Q5: Draw the labelled diagram of the following: (i) gram seed (ii) V.S. of maize seed

Accepted Answer

Since drawing is not possible, the labeled parts of each seed are described below, based on Figures 5.14 and 5.15 in the textbook. (i) Gram Seed (Dicotyledonous Seed) A gram seed is a typical dicot, non-endospermic seed. Its main parts are:    Seed Coat: The outermost protective layer, which is made...

Question 7

Q6: Take one flower of the family Solanaceae and write its semi-technical description. Also draw their floral diagram.

Accepted Answer

A semi-technical description of a flower from the family Solanaceae (e.g., Solanum nigrum) is as follows: Floral Characters:    Inflorescence: Solitary, axillary or cymose.    Flower: Bisexual, actinomorphic.    Calyx: Consists of five sepals, which are united (gamosepalous). They are persistent and...

Question 8

Q7: Describe the various types of placentations found in flowering plants.

Accepted Answer

Placentation refers to the arrangement of ovules within the ovary. The different types are: 1.  Marginal Placentation: The placenta forms a ridge along the ventral suture of the ovary, and the ovules are borne on this ridge, forming two rows. This is characteristic of the family Leguminosae....

Question 9

Q8: What is a flower? Describe the parts of a typical angiosperm flower.

Accepted Answer

A flower is the reproductive unit in the angiosperms. It is a modified shoot that is specialized for sexual reproduction. The shoot apical meristem changes to a floral meristem, the axis gets condensed, and the internodes do not elongate. A typical angiosperm flower consists of four different kinds...

Question 10

Q9: Define the term inflorescence. Explain the basis for the different types inflorescence in flowering plants.

Accepted Answer

Inflorescence is defined as the arrangement of flowers on the floral axis of a plant. The basis for classifying inflorescences into different types is whether the apex of the floral axis gets converted into a flower or continues to grow. Based on this, there are two major types of inflorescences: 1....

NCERT Solutions