Debit Note : This is referred to a note that is issued by the business to the other concerned parties. It represents the details and reasons for debiting the concerned party's account.
Example: Goods worth Rs 2,000 returned by the business to  Mr. Ramesh (a supplier).
In this case, Ramesh's Account will be debited with Rs 2,000 as the goods purchased from him were returned to him. A issue of Debit Note in this case explains that Ramesh A/c has been debited with Rs 2,000 with explanation, i.e. due to the goods returned by the business.

(i) Statistics does not study about individuals : Statistics are expressed in facts. It does not study individuals. For example, there are five students in a class. Statistics only tells the average marks obtained in class not how many marks are obtained by every student in the class.
(ii) It does not study the qualitative aspect of problem : The most important condition of statistical study is that subject of investigation and inquiry should be capable of being qualitatively measured. For example, honesty, poverty, etc.
(iii) Statistics can be misused: The result obtained can be manipulated accordingly to one’s own interest and such manipulated results can mislead the community.
(iv) Statistical results lack mathematical accuracy: The results drawn from statistical analysis are normally in approximates. As the satistical analysis is based on observation of mass data, number of inaccuracies may be present and it is difficult to rectify them.
(v) Uniformity and homogeneity of data : It is essential that data must have the quality of uniformity and homogeneity. Heterogeneous data are not comparable. For example, it would be meaningless to compare the heights of men with heights of trees because these figures are of heterogeneous character.

FSH regulates the development, growth, pubertal maturation and reproductive processes of the human body. In both males and females, FSH stimulates the maturation of primordial germ cells. Follicle stimulating hormone is one of the hormones essential to pubertal development and the function of women's ovaries and men's testes. In women, this hormone stimulates the growth of ovarian follicles in the ovary before the release of an egg from one follicle at ovulation. It also increases oestradiol production.

Insulin helps control blood glucose levels by signaling the liver and muscle and fat cells to take in glucose from the blood. Insulin therefore helps cells to take in glucose to be used for energy. If the body has sufficient energy, insulin signals the liver to take up glucose and store it as glycogen.

Photoperiodism . It is the response of plants to periods of day/night. The flowering in some plants depends not only on a combination of light and dark exposures but also their relative durations. The plants that need a longer duration for a period exceeding a well defined critical duration, while the short day plants must be exposed to light for a period less than this critical duration before the flowering is initiated in them.
Vernalisation refers specially to the promotion of flowering by a period of low temperature. Significance Vernalisation prevents precocious reproductive development late in the growing season. This enables the plant to have sufficient time to reach maturity.

Actinomorphic : Actinomorphic flowers can be divided into two radial halves by any radial plane passing through its centre. Examples of these flowers include chilly and mustard.

Epipetalous Stamen : Epipetalous stamens are stamens attached to the petals. They are found in brinjal.

There are mainly three types of vascular bundles:

(i) Radial: Those in which the xylem and the phloem lie radically side-by-side (for example, in roots of seed plants). This is the most primitive type.

(ii) Conjoint: Those in which the two types of tissues are separated from one another. Here xylem and phloem together form a bundle. The two sub-types are collateral and bicollateral.

(a) Collateral: The xylem and phloem lie together on the same radius in such a position that xylem lies inwards and the phloem outwards. Here the phloem occurs on one side of the xylem strand. In the dicotyledonous stem, the cambium is found to be present in between xylem and phloem, such bundles are called open (for example, in <i>Helianthus</i>) and when the cambium is absent, it is called closed (for example, in monocotyledonous stems).

(b) Bicollateral: In such bundles, the phloem is found to be present on both sides of xylem. Simultaneously two cambium strips also occur. Various elements are arranged in the following sequence-outer phloem, outer cambium, xylem, inner cambium and inner phloem. Such bundles are commonly found in the members of Cucurbitaceae. Such bundles are always open.

(iii) Concentric: Those in which one type of tissue surrounds or ensheaths the other. The concentric bundles may be of two subtypes, amphivasal bundle as found in Dracaena., Yucca and other monocots and some dicots. If the phloem surrounds the xylem, it is amphicribal as found in many ferns. Such bundles are always closed.

Cockroach has biting and chewing type of mouth parts.It consists of
labrum-upper lip
a pair of mandibles
a pair of maxillae
labium-lower lip.