WHAT IS APOMIXIS? DESCRIBE ITS IMPORTANCE?

WHAT IS APOMIXIS? DESCRIBE ITS IMPORTANCE?
by

1 Answer

Answer :

ANS. IT IS THE PROCESS OF DEVELOPMENT OF SEEDS WITHOUT FERTILISATION. EXAMPLE:
SOME SPECIES OF ASTERACEAE AND GRASSES.
IMPORTANCE: APOMICTIC GENES CAN BE INTRDUED IN HYBRID SEED INDUSTRY.
by

Related questions

DESCRIBE THE PROCESS OF OOGENESIS IN HUMAN FEMALE AND DIFFERENTIATE IT WITH SPERMATOGENESIS ON THE BASIS OF TIME OF INITIATION AND THE PRODUCTS FORMED.

Description : DESCRIBE THE PROCESS OF OOGENESIS IN HUMAN FEMALE AND DIFFERENTIATE IT WITH SPERMATOGENESIS ON THE BASIS OF TIME OF INITIATION AND THE PRODUCTS FORMED.

Last Answer : ANS. OOGENESIS : DIAGRAMMATIC REPRESENTATION AS GIVEN IN NCERT. DIFFERENCES BETWEEN : OOGENESIS SPERMATOGENESIS (i) STARTS DURING FOETAL LIFE (i) STARTS DURING PUBERTY (ii)PRODUCTS: OVUM (ii) SPERMS

DESCRIBE THE CONTRACEPTIVE ACTIONS OF IUDs.

Description : DESCRIBE THE CONTRACEPTIVE ACTIONS OF IUDs.

Last Answer : ANS. (i) INCREASES PHAGOCYTOSIS OF SPERMS (ii) SUPPRESS SPERM MOTILITY (iii) SUPPRESS FERTILISING CAPACITY OF SPERMS (iv) MAKES CERVIX HOSTILE TO SPERMS.

(a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.

Description : (a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.

Last Answer : ANS (a) (i) OVARY (ii) FALLOPIAN TUBE (iii) AMPULLA-ISTHAMUS JUNCTION OF FALLOPIAN TUBE (iv) ENDOMETRIUM LINING OF UTERUS (b) HUMAN CHORIONIC GONADOTROPIN AND HUMAN PLACENTAL LACTOGEN

(A) MENTION ANY FOUR STRATEGIES ADOPTED BY FLOWERING PLANTS TO PREVENT SELF-POLLINATION. (B) DEFINE THE TERM EMASCULATION.

Description : (A) MENTION ANY FOUR STRATEGIES ADOPTED BY FLOWERING PLANTS TO PREVENT SELF-POLLINATION. (B) DEFINE THE TERM EMASCULATION.

Last Answer : ANS.(a) (i) SELF INCOMPATIBILITY (ii) PRODUCTION OF UNICELLULAR FLOWERS (iii) ANTHERS AND STIGMA ARE PLACED AT DIFFERENT POSITIONS. (iv) MATURATION OF ANTHER AND STIGMA IS NOT ... EMASCULATION: REMOVAL OF ANTHER BEFORE MATURITY SO AS TO ENSURE CROSS POLLINATION IN SELF POLLINATING FLOWERS.

DIFFERENTIATE BETWEEN MORULA AND BLASTULA STAGES OF MAMMALIAN EMBRYO.

Description : DIFFERENTIATE BETWEEN MORULA AND BLASTULA STAGES OF MAMMALIAN EMBRYO.

Last Answer : ANS. MORULA: (i) 8 TO 16 CELLED STAGE EMBRYO (ii) SOLID WITHOUT ANY CAVITY BLASTULA: (i) 32 CELLED STAGE EMBRYO. (ii) HOLLOW WITH A CAVITY CALLED BLASTOCOEL

WHAT IS CORPUS LUTEUM ? UNDER WHAT CONDITIONS DOES IT UNDERGO DEGENERATION ?

Description : WHAT IS CORPUS LUTEUM ? UNDER WHAT CONDITIONS DOES IT UNDERGO DEGENERATION ?

Last Answer : ANS. THE CORPUS LUTEUM IS FORMED IN THE MAMMALIAN OVARY FROM RUPTURED GRAAFIAN FOLLICLE AFTER OVULATION. IT DEGENERATES IN THE ABSENCE OF FERTILISATION, AS THE LEVEL OF FSH AND LH DROPS.

WRITE THE FUNTION OF EACH OF THE FOLLOWING: (a) MIDDLE PIECE OF HUMAN SPERM (b) LUTEINIZING HORMONE IN HUMAN MALES

Description : WRITE THE FUNTION OF EACH OF THE FOLLOWING: (a) MIDDLE PIECE OF HUMAN SPERM (b) LUTEINIZING HORMONE IN HUMAN MALES

Last Answer : ANS. (a) PROVIDES ENERGY FOR MOVEMENT DUE TO PRESENCE OF MITOCHONDRIA. (c) STIMULATES SYNTHESIS AND SECRETION OF ANDROGENS.

STATE ONE ADVANTAGE AND ONE DISADVANTAGE OF CLEISTOGAMY.

Description : STATE ONE ADVANTAGE AND ONE DISADVANTAGE OF CLEISTOGAMY.

Last Answer : ANS. ADVANTAGE: ASSURED SEED SET DISADVANTAGE: INBREEDING DEPRESSION.

WHY IS THE PROCESS OF FERTILISATION IN A FLOWERING PLANT REFFERED TO AS DOUBLE FERTILISATION ?

Description : WHY IS THE PROCESS OF FERTILISATION IN A FLOWERING PLANT REFFERED TO AS DOUBLE FERTILISATION ?

Last Answer : ANS. DOUBLE FERTILISATION= SYNGAMY + TRIPLE FUSION SYNGAMY= ONE MALE GAMETE + EGG--- ZYGOTE(n) TRIPLE FUSION= ANOTHER MALE GAMETE+ POLAR NUCLEI-PRIMARY ENOSPERM NUCLEUS(3n)

WHEN DO THE OOGENESIS AND THE SPERMATOGENESIS INITIATE IN HUMAN FEMALES AND MALES RESPECTIVELY ?

Description : WHEN DO THE OOGENESIS AND THE SPERMATOGENESIS INITIATE IN HUMAN FEMALES AND MALES RESPECTIVELY ?

Last Answer : ANS. OOGENESIS AT THE FOETAL LIFEAND SPERMATOGENISIS STARTS AT PUBERTY.

WRITE THE LOCATION AND FUNCTION OF SERTOLI CELLS IN HUMANS.

Description : WRITE THE LOCATION AND FUNCTION OF SERTOLI CELLS IN HUMANS.

Last Answer : ANS. IN THE SEMINIFEROUS TUBULES OF TESTIS, NOURISHES DEVELOPING SPERMS.

AT WHAT STAGE IS THE MAMMALIAN EMBRYO IMPLANTED IN THE UTERUS ?

Description : AT WHAT STAGE IS THE MAMMALIAN EMBRYO IMPLANTED IN THE UTERUS ?

Last Answer : ANS. AT THE BLASTOCYST STAGE.

NAME THE PROTECTIVE SUBSTANCE PRESENT IN THE POLLEN ENVELOPE TO TIDE OVER ADVERSE CONDITIONS.

Description : NAME THE PROTECTIVE SUBSTANCE PRESENT IN THE POLLEN ENVELOPE TO TIDE OVER ADVERSE CONDITIONS.

Last Answer : ANS. SPOROPOLLENIN.

NAME THE TYPE OF FLOWER WHICH FAVOURS CROSS POLLINATION.

Description : NAME THE TYPE OF FLOWER WHICH FAVOURS CROSS POLLINATION.

Last Answer : ANS. CHASMOGAMOUS.

WHAT IS PERISPERM ?

Description : WHAT IS PERISPERM ?

Last Answer : ANS. THE RESIDUAL NUCELLUS, WHICH PERSISTS IN THE SEEDS IS CALLED AS PERISPERM.

NAME THE PHENOMENON AND ONE BIRD WHERE THE FEMALE GAMETE DIRECTLY DEVELOPS INTO A NEW ORGANISM.

Description : NAME THE PHENOMENON AND ONE BIRD WHERE THE FEMALE GAMETE DIRECTLY DEVELOPS INTO A NEW ORGANISM.

Last Answer : ANS. PARTHENOGENESIS, TURKEY.

WHY ARE DATE PALMS REFFERED TO AS DIOECIOUS ?

Description : WHY ARE DATE PALMS REFFERED TO AS DIOECIOUS ?

Last Answer : ANS. BECAUSE THEY HAVE UNISEXUAL FLOWERS BORNE ON SEPARATE PLANTS.

WHAT TERM IS GIVEN BY YOU TO THE GROUP OF INDIVIDUALS WHICH ARE GENETICALLY AND MORPHOLOGICALLY IDENTICAL ?

Description : WHAT TERM IS GIVEN BY YOU TO THE GROUP OF INDIVIDUALS WHICH ARE GENETICALLY AND MORPHOLOGICALLY IDENTICAL ?

Last Answer : ANS. CLONE

Importance of apomixis in plant breeding? -Biology

Description : Importance of apomixis in plant breeding? -Biology

Last Answer : Apomixis produces seed progeny that are exact replicas of the mother plant. The major advantage of apomixis over sexual reproduction is the possibility to select individuals with desirable gene combinations and to propagate them as clones.

Are pollination and fertilization necessary in apomixis? -Biology

Description : Are pollination and fertilization necessary in apomixis? -Biology

Last Answer : answer:

What is apomixis in plant breeding? -Biology

Description : What is apomixis in plant breeding? -Biology

Last Answer : Apomixis (asexual seed formation) is the result of a plant gaining the ability to bypass the most fundamental aspects of sexual reproduction: meiosis and fertilization. Without the need for male fertilization, the resulting seed germinates a plant that develops as a maternal clone

What is the difference between apomixis and parthenocarpy? -Biology

Description : What is the difference between apomixis and parthenocarpy? -Biology

Last Answer : answer:

Difference between parthenocarpy and apomixis. -Biology

Description : Difference between parthenocarpy and apomixis. -Biology

Last Answer : answer:

$ Asexual reproduction is also called Apomixis. ! Apogamy shortens the life cycle of a plant.

Description : $ Asexual reproduction is also called Apomixis. ! Apogamy shortens the life cycle of a plant.

Last Answer : $ Asexual reproduction is also called Apomixis. ! Apogamy shortens the life cycle of a plant. A. If both ... is wrong D. If both As and R are wrong.

Development of Sporophyte from gametophyte tissue without fusion of gametes is: (a) Apospory (b) Apogamy (c) Apomixis (d) Parthenogenesis

Description : Development of Sporophyte from gametophyte tissue without fusion of gametes is: (a) Apospory (b) Apogamy (c) Apomixis (d) Parthenogenesis

Last Answer : Ans. ((b))

Development of saprophyte from gametophyte, is called (a) Apomixis (b) Apospory (c) Apogamy (d) Dip1ospory

Description : Development of saprophyte from gametophyte, is called (a) Apomixis (b) Apospory (c) Apogamy (d) Dip1ospory

Last Answer : Ans. ((c))

Formation of diploid embryosac from diploid vegetative structure, e.g., nucellus or integument etc., without meiosis is called: (a) Apospory (b) Apomixis (c) Diplospory (d) Adventives polyembryony

Description : Formation of diploid embryosac from diploid vegetative structure, e.g., nucellus or integument etc., without meiosis is called: (a) Apospory (b) Apomixis (c) Diplospory (d) Adventives polyembryony

Last Answer : Ans. ((a))

When one plant has both male and female flowers separately, is called— (A) Monophrodits (B) Monoecious (C) Hermaphrodite (D) Apomixis

Description : When one plant has both male and female flowers separately, is called— (A) Monophrodits (B) Monoecious (C) Hermaphrodite (D) Apomixis

Last Answer : (B) Monoecious

Study of formation, growth and development of new individual from an egg is (a) apomixis (b) embryology (c) embryogeny (d) cytology.

Description : Study of formation, growth and development of new individual from an egg is (a) apomixis (b) embryology (c) embryogeny (d) cytology.

Last Answer : (b) embryology

.In a type of apomixis known as adventive embryony, embryos develop directly from the (a) nucellus or integuments (b) zygote (c) synergids or antipodals in an embryo sac (d) accessory embryo sacs in the ovule

Description : .In a type of apomixis known as adventive embryony, embryos develop directly from the (a) nucellus or integuments (b) zygote (c) synergids or antipodals in an embryo sac (d) accessory embryo sacs in the ovule

Last Answer : (a) nucellus or integuments

What is common between vegetative reproduction and apomixis? (a) Both are applicable to only dicot plants. (b) Both bypass the flowering phase. (c) Both occur round the year. (d) Both produce progeny identical to the parent.

Description : What is common between vegetative reproduction and apomixis? (a) Both are applicable to only dicot plants. (b) Both bypass the flowering phase. (c) Both occur round the year. (d) Both produce progeny identical to the parent.

Last Answer : (d) Both produce progeny identical to the parent

Seed formation without fertilisation in flowering plants involves the process of (a) somatic hybridisation (b) apomixis (c) sporulation (d) budding

Description : Seed formation without fertilisation in flowering plants involves the process of (a) somatic hybridisation (b) apomixis (c) sporulation (d) budding

Last Answer : (b) apomixis

Occurrence of more than one embryo in a seed is known as: a) Polyembryony b) parthenocarpy c) Apomixis d) Embryogeny

Description : Occurrence of more than one embryo in a seed is known as: a) Polyembryony b) parthenocarpy c) Apomixis d) Embryogeny

Last Answer : Ans: a) Polyembryony

What is common between vegetative reproduction and Apomixis?a)Both are applicable to only dicot plantsb)Both bypass the flowering phasec)Both occur round the yeard)Both produces progeny identical to the paren

Description : What is common between vegetative reproduction and Apomixis?a)Both are applicable to only dicot plantsb)Both bypass the flowering phasec)Both occur round the yeard)Both produces progeny identical to the paren

Last Answer : Both produces progeny identical to the parent

What is the Ho Chi Minh trail? Describe any three points of its importance. -SST 10th

Description : What is the Ho Chi Minh trail? Describe any three points of its importance. -SST 10th

Last Answer : The Ho Chi Minh trail was an immense network of footpaths and roads, used to transport men and materials from the north to the south during the Vietnam war. Importance : (i) The story of the Ho ... was used by about 20,000 North Vietnamese troops who came to the south each month using this trail.

What is Ho Chi Minh trail? Describe any three points of its importance. -SST 10th

Description : What is Ho Chi Minh trail? Describe any three points of its importance. -SST 10th

Last Answer : The Ho Chi Minh Trail was not just one trail but a series of trails. The Ho Chi Minh Trail was used by the North Vietnamese as a route for its troops to get into the South. They also used ... trail was used by about 20,000 North Vietnamese troops who came to the south each month using this trail.

What is the Ho Chi Minh trail? Describe any three points of its importance. -SST 10th

Description : What is the Ho Chi Minh trail? Describe any three points of its importance. -SST 10th

Last Answer : 1. It was used to transport men and material from north to the south Vietnam. 2.after 1967 about 20,000 north Vietnamese troops came south each month on this trail. 3.The trial had ... lines extending into south Vietnam. 5.US regularly bombed this trail...but Vietnamese used quickly rebuilt it.

What are synthetic seeds or artificial seeds? Describe its importance? -Biology

Description : What are synthetic seeds or artificial seeds? Describe its importance? -Biology

Last Answer : answer:

What are synthetic seeds or artificial seeds? Describe its importance? -Biology

Description : What are synthetic seeds or artificial seeds? Describe its importance? -Biology

Last Answer : answer:

Define heredity and describe its importance in transferring characteristics from parents to offspring.

Description : Define heredity and describe its importance in transferring characteristics from parents to offspring.

Last Answer : During reproduction, living things pass on their characteristics to their offspring. This process is called heredity for examples I. Colour of eye II. Skin colour III. Hair colour IV. Free or attached earlobes V. Height VI. Intelligence

Describe the procedure of water proofing used in slabs stating its importance in building construction.

Description : Describe the procedure of water proofing used in slabs stating its importance in building construction.

Last Answer : Following is the stepwise procedure effectively applied in treatment of brick bat coba.  1 All existing treatment or coating on roof slab top is initially removed and surface is cleaned by hard wire brush ... surface is marked with 300 mm false squares The curing is done on next day. 

Comment on the effect of negative feedback on the gain, input and output resistance of the feedback amplifiers.Describe the gain bandwidth product term used in this context and its importance.

Description : Comment on the effect of negative feedback on the gain, input and output resistance of the feedback amplifiers.Describe the gain bandwidth product term used in this context and its importance.

Last Answer : Effect of negative feedback: 1. Gain decreases with negative feedback. 2. Input resistance increases with negative feedback. 3. Output resistance decreases with negative feedback. Explanation ... feedback bandwidth increases which means it is stable output on more range of frequency.

What is the importance of railway transport? Describe any three major problems faced by Indian Railways. -Geography

Description : What is the importance of railway transport? Describe any three major problems faced by Indian Railways. -Geography

Last Answer : Importance of railway transportation: a) It is the important mode of transportation for freight and passengers in India. b) The railway does multipurpose activities like business, ... railway property and passengers travelling without tickets are some problems that Indian railway faces.

Describe any four points of importance of primary sector in the Indian economy. -SST 10th

Description : Describe any four points of importance of primary sector in the Indian economy. -SST 10th

Last Answer : (i) Primary sector contributes more than 20% to the GDP of India. (ii) Its employment share is more than 55%. (iii) It is the most labouring sector of Indian economy. (iv) It covers agriculture, dairy, fishing, forestry which all contribute to the Indian economy.

Describe any two facts regarding the importance of manganese in our daily life. -SST 10th

Description : Describe any two facts regarding the importance of manganese in our daily life. -SST 10th

Last Answer : Manganese is mainly used in the manufacturing of steel and ferro-manganese alloy. Nearly 10 kg of manganese is required to manufacture one tonne of steel. It is also used in manufacturing ... country's total production in 2000-01. Other manganese-producing states are Madhya Pradesh and Karnataka.

Describe the importance of pipelines in India. Name three important networks of pipeline transportation in the country. -SST 10th

Description : Describe the importance of pipelines in India. Name three important networks of pipeline transportation in the country. -SST 10th

Last Answer : Pipeline transport network is a new arrival on the transportation map of India.Earlier it was used to transport water but these days it is used for the following: (i) Transport of crude oil, ... Vijaipur in MP. It has branches to Kota in Rajasthan, Shahajahanpur, Babrala and other places in UP.

Describe any three importance of coal as a source of energy. -SST 10th

Description : Describe any three importance of coal as a source of energy. -SST 10th

Last Answer : Importance of coal as a source of energy in India are: (i) Coal is the most abundantly available fossil fuel in India. (ii) It provides a substantial part of the nation’s energy needs. (iii) It is used for power generation. (iv) It supplies energy to industry as well as for domestic needs.

Describe any three importance of coal as a source of energy. -SST 10th

Description : Describe any three importance of coal as a source of energy. -SST 10th

Last Answer : Importance of coal as a source of energy in India are: (i) Coal is the most abundantly available fossil fuel in India. (ii) It provides a substantial part of the nation’s energy needs. (iii) It is used for power generation. (iv) It supplies energy to industry as well as for domestic needs.

Describe the importance of manufacturing. -SST 10th

Description : Describe the importance of manufacturing. -SST 10th

Last Answer : The economic strength of a country lies in the development of manufacturing industries because: (i) Manufacturing industries help in modernising agriculture which forms the backbone of our economy. ... trade and commerce and enhances prosperity. (vi) It brings much needed foreign exchange.

Describe the importance of colours on the toposheet? -SST 10th

Description : Describe the importance of colours on the toposheet? -SST 10th

Last Answer : The use of various colours are essential to show the various features on the toposheet e.g. the cultivated area is always shown by the yellow colour and the green colour on the toposheet, shows the forested and wooded area.