why sterile tissues degenerate in anther during the maturation of pollen grain -Biology

why sterile tissues degenerate in anther during the maturation of pollen grain -Biology
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Male gametophyte of angiosperms is shed at (a) four celled pollen grain (b) three celled pollen grain (c) microspore mother cell (d) anther.

Description : Male gametophyte of angiosperms is shed at (a) four celled pollen grain (b) three celled pollen grain (c) microspore mother cell (d) anther.

Last Answer : b) three celled pollen grain

The plant parts which consist of two generations- one within the other (1) pollen grains inside the anther (2) germinated pollen grain with two male gametes (3) seed inside the fruit (4) embryo sac inside the ovule (a) (1) only (b) (1), (2), and (3) (c) (3) and (4)

Description : The plant parts which consist of two generations- one within the other (1) pollen grains inside the anther (2) germinated pollen grain with two male gametes (3) seed inside the fruit (4) embryo sac inside the ovule (a) (1) only (b) (1), (2), and (3) (c) (3) and (4)

Last Answer : (d) (1) and (4).

When pollen is transferred from the anther to the stigma? -Biology

Description : When pollen is transferred from the anther to the stigma? -Biology

Last Answer : answer:

When pollen is transferred from the anther to the stigma? -Biology

Description : When pollen is transferred from the anther to the stigma? -Biology

Last Answer : answer:

Which one of the following statements is correct? (a) The seed in grasses is not endospermic. (b) Mango is a parthenocarpic fruit. (c) A proteinaceous aleurone layer is present in maize grain. (d) A sterile pistil is called a staminode.

Description : Which one of the following statements is correct? (a) The seed in grasses is not endospermic. (b) Mango is a parthenocarpic fruit. (c) A proteinaceous aleurone layer is present in maize grain. (d) A sterile pistil is called a staminode.

Last Answer : (c) A proteinaceous aleurone layer is present in maize grain.

Physiological aging activity in which plant tissues degenerate and ultimately die is called a. Senescence b. Ripening c. Climacteric d. Degeneration

Description : Physiological aging activity in which plant tissues degenerate and ultimately die is called a. Senescence b. Ripening c. Climacteric d. Degeneration

Last Answer : Senescence

Anther or pollen culture technique is used to obtained

Description : Anther or pollen culture technique is used to obtained

Last Answer : Ans. Haploid plants

Consider the following statements about pollination. 1. Transfer of pollen grains from the anther to ovules in the same flower or a different f lower is called pollination. 2. The pollination by wind is called anemophily. 3. Pollination is a prerequisite for seed and fruit development in all flowering plants. 4. Seeds may develop in some water ferns without pollination. Which of the above statement/s is/are correct? (a) 1 and 3 (b) 1, 2 and 4 (c) Only 2 (d) 1, 2, 3 and 4

Description : Consider the following statements about pollination. 1. Transfer of pollen grains from the anther to ovules in the same flower or a different f lower is called pollination. 2. The pollination by wind is called anemophily. 3. Pollination is a ... 1 and 3 (b) 1, 2 and 4 (c) Only 2 (d) 1, 2, 3 and 4

Last Answer : Ans:(c)

The floral part that produces pollen grains is (1) Sepal (2) Petal (3) Anther (4) Ovary

Description : The floral part that produces pollen grains is (1) Sepal (2) Petal (3) Anther (4) Ovary

Last Answer : (3) Anther Explanation: The anther contains microsporangia. Each microsporangium contains pollen mother cells. These undergo meiosis, and produce pollen grains, which contain the male gametes (sperm). The pollen is released by the opening of the anther.

The floral part that produces pollen grains is - (1 ) Sepal (2) Petal (3) Anther (4) Ovary

Description : The floral part that produces pollen grains is - (1 ) Sepal (2) Petal (3) Anther (4) Ovary

Last Answer : (3) Anther Explanation: Anther is the apical portion of a stamen, which produces the microspores or pollen grains. An anther normally comprises four pollen sacs arranged in two groups or lobes joined by the connective tissue to the filament

Which ones produce androgenic haploids in anther cultures? (a) Anther wall (b) Tapetal layer of anther wall (c) Connective tissue (d) Young pollen grains

Description : Which ones produce androgenic haploids in anther cultures? (a) Anther wall (b) Tapetal layer of anther wall (c) Connective tissue (d) Young pollen grains

Last Answer : (d) Young pollen grains

Anthesis is a phenomenon which refers to (a) reception of pollen by stigma (b) formation of pollen (c) development of anther (d) opening of flower bud.

Description : Anthesis is a phenomenon which refers to (a) reception of pollen by stigma (b) formation of pollen (c) development of anther (d) opening of flower bud.

Last Answer : (d) opening of flower bud.

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called (a) xenogamy (b) geitonogamy (c) karyogamy (d) autogamy.

Description : Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called (a) xenogamy (b) geitonogamy (c) karyogamy (d) autogamy.

Last Answer : (b) geitonogamy

Which one of the following statements is not true? (a) Pollen grains of many species cause severe allergies. (b) Stored pollen in liquid nitrogen can be used in the crop breeding programmes. (c) Tapetum helps in the dehiscence of anther. (d) Exine of pollen grains is made up of sporopollenin.

Description : Which one of the following statements is not true? (a) Pollen grains of many species cause severe allergies. (b) Stored pollen in liquid nitrogen can be used in the crop breeding programmes. (c) Tapetum helps in the dehiscence of anther. (d) Exine of pollen grains is made up of sporopollenin.

Last Answer : (c) Tapetum helps in the dehiscence of anther.

What part of the flower contains the pollen? a) Anther b) Stigma c) Leaves d) Stem

Description : What part of the flower contains the pollen? a) Anther b) Stigma c) Leaves d) Stem

Last Answer : a) Anther

The transfer of pollen grains from anther to stigma is called; a) Fertilization b) pollination c) Microsporogenesis d) Polyembryony

Description : The transfer of pollen grains from anther to stigma is called; a) Fertilization b) pollination c) Microsporogenesis d) Polyembryony

Last Answer : Ans. b) Pollination

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:a) Autogamyb) Xenogamyc) Geitonogamyd) Karyogamy

Description : Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:a) Autogamyb) Xenogamyc) Geitonogamyd) Karyogamy

Last Answer : c) Geitonogamy

The part of the flower that is adapted to catch pollen is the: a) stigma b) style c) anther d) ovule

Description : The part of the flower that is adapted to catch pollen is the: a) stigma b) style c) anther d) ovule

Last Answer : ANSWER: A -- STIGMA

In flowers the terminal part of a stamen, containing the pollen sacs is known as the: a) anther b) style c) filament d) pistil

Description : In flowers the terminal part of a stamen, containing the pollen sacs is known as the: a) anther b) style c) filament d) pistil

Last Answer : ANSWER: A -- Anther

The floral part that produces pollen grains is (1) Sepal (2) Petal (3) Anther (4) Ovary

Description : The floral part that produces pollen grains is (1) Sepal (2) Petal (3) Anther (4) Ovary

Last Answer : Anther

Plant tranquillisers (A) Hold back stem growth and halt plants at a desired height (B) Cause early maturation of plants (C) Accelerate ripening of food and grain(D) Produce seedless fruit

Description : Plant tranquillisers (A) Hold back stem growth and halt plants at a desired height (B) Cause early maturation of plants (C) Accelerate ripening of food and grain (D) Produce seedless fruit

Last Answer : (A) Hold back stem growth and halt plants at a desired height

Part of gynoecium that determines the compatible nature of pollen grain. -Biology

Description : Part of gynoecium that determines the compatible nature of pollen grain. -Biology

Last Answer : answer:

Role of tapetum in the formation pollen-grain wall? -Biology

Description : Role of tapetum in the formation pollen-grain wall? -Biology

Last Answer : answer:

Pollen grain of hibiscus? -Biology

Description : Pollen grain of hibiscus? -Biology

Last Answer : answer:

Explain the structure of pollen grain? -Biology

Description : Explain the structure of pollen grain? -Biology

Last Answer : answer:

Explain the structure of pollen grain? -Biology

Description : Explain the structure of pollen grain? -Biology

Last Answer : answer:

What Differ between cheek cells and pollen grain?

Description : What Differ between cheek cells and pollen grain?

Last Answer : Need answer

Haploid cells belong to: (a) Integument, pollen grain, endosperm (b) Embryo, endosperm and pollen grain (c) Megaspore, pollen grain, antipodal (d) Integument, pollen grain and antipodal

Description : Haploid cells belong to: (a) Integument, pollen grain, endosperm (b) Embryo, endosperm and pollen grain (c) Megaspore, pollen grain, antipodal (d) Integument, pollen grain and antipodal

Last Answer : Ans. ((c))

The study of pollen grain is known as : (a) Palaeobotany (b) Palynology (c) Pomology (d) Phonology

Description : The study of pollen grain is known as : (a) Palaeobotany (b) Palynology (c) Pomology (d) Phonology

Last Answer : Ans:(b)

Point out the odd one. (a) Nucellus (b) Embryo sac (c) Micropyle (d) Pollen grain

Description : Point out the odd one. (a) Nucellus (b) Embryo sac (c) Micropyle (d) Pollen grain

Last Answer : (d) Pollen grain

Which one of the following is surrounded by a callose wall? (a) Male gamete (b) Egg (c) Pollen grain (d) Microspore mother cell

Description : Which one of the following is surrounded by a callose wall? (a) Male gamete (b) Egg (c) Pollen grain (d) Microspore mother cell

Last Answer : (d) Microspore mother cell

n Pinus/gymnosperms, the haploid structure are (a) megaspore, endosperm and embryo (b) megaspore, pollen grain and endosperm (c) megaspore, integument and root (d) pollen grain, leaf and root.

Description : n Pinus/gymnosperms, the haploid structure are (a) megaspore, endosperm and embryo (b) megaspore, pollen grain and endosperm (c) megaspore, integument and root (d) pollen grain, leaf and root.

Last Answer : (b) megaspore, pollen grain and endosperm

.In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have (a) 12 (b) 18 (c) 6 (d) 24.

Description : .In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have (a) 12 (b) 18 (c) 6 (d) 24.

Last Answer : (c) 6

In gymnosperms, the pollen chamber represents (a) a cavity in the ovule in which pollen grains are stored after pollination (b) an opening in the megagametophyte through which the pollen tube approaches the egg(c) the microsporangium in which pollen grains develop (d) a cell in the pollen grain in which the sperms are formed.

Description : In gymnosperms, the pollen chamber represents (a) a cavity in the ovule in which pollen grains are stored after pollination (b) an opening in the megagametophyte through which the pollen tube approaches the ... pollen grains develop (d) a cell in the pollen grain in which the sperms are formed.

Last Answer : (c) the microsporangium in which pollen grains develop

12. ------------ is the composition of the intine of the pollen grain (a) cellulose and kitin (b) kitin and polysaccharide (c) cellulose and pectin (d) polysaccharide and glycoprotein

Description : 12. ------------ is the composition of the intine of the pollen grain (a) cellulose and kitin (b) kitin and polysaccharide (c) cellulose and pectin (d) polysaccharide and glycoprotein

Last Answer : (c) cellulose and pectin

Name two cells of a mature pollen grain?

Description : Name two cells of a mature pollen grain?

Last Answer : Ans: Vegetative cell and Generative cell

Exine layer of pollen grain is made up of : a) sporopollenin b)Pectin c) cellulose d)chitin

Description : Exine layer of pollen grain is made up of : a) sporopollenin b)Pectin c) cellulose d)chitin

Last Answer : Ans: a)sporopollenin

In a cell haploid chromosome number is 15. What number is found in Pollen grain, Zygote, Primary endosperm nucleus and Colchicine treated zygote.

Description : In a cell haploid chromosome number is 15. What number is found in Pollen grain, Zygote, Primary endosperm nucleus and Colchicine treated zygote. 

Last Answer : Ans: 15 in pollen grain, 30 in zygote, 45 in Primary Endosperm nucleus and 60 in colchicine treated zygote.

Study of pollen grain is called- (a) Pomology (b) Palynology (c) Phocology (d) Mycology

Description : Study of pollen grain is called- (a) Pomology (b) Palynology (c) Phocology (d) Mycology

Last Answer : (b) Palynology 

Which types of division take place during second maturation division ?

Description : Which types of division take place during second maturation division ?

Last Answer : Which types of division take place during second maturation division ? A. Reduction division B. Equational division C. Amitosis D. None

The minute cells which separate from the developing ova during their maturation are called

Description : The minute cells which separate from the developing ova during their maturation are called

Last Answer : The minute cells which separate from the developing ova during their maturation are called A. ... Oogonia C. Polar bodies D. Primary spermatogonia

Which one of the following is the correct matching of the events occurring during menstrual cycle? (a) Proliferative phase : Rapid regeneration of myometrium and maturation of Graafian follicle (b) Secretory phase : Development of corpus luteum and increased secretion of progesterone (c) Menstruation : Breakdown of myometrium and ovum not fertilised (d) Ovulation : LH and FSH attain peak level and sharp fall in the secretion of progesterone

Description : Which one of the following is the correct matching of the events occurring during menstrual cycle? (a) Proliferative phase : Rapid regeneration of myometrium and maturation of Graafian follicle (b) ... ) Ovulation : LH and FSH attain peak level and sharp fall in the secretion of progesterone

Last Answer : (b) Secretory phase : Development of corpus luteum and increased secretion of progesterone

Of all the factors that increase the resistance of teeth to dental caries, THE MOST EFFECTIVE is,** A. The general nutrition of a child during the period of tooth formation B. The intake of fluoride during the period of enamel mineralization and maturation C. Periodic topical fluoride application by dental health care following tooth eruption D. Sufficient intake of calcium and Vitamin D during the period of enamel mineralization and maturation

Description : Of all the factors that increase the resistance of teeth to dental caries, THE MOST EFFECTIVE is,** A. The general nutrition of a child during the period of tooth formation B. The ... eruption D. Sufficient intake of calcium and Vitamin D during the period of enamel mineralization and maturation

Last Answer : B. The intake of fluoride during the period of enamel mineralization and maturation

8.The reason for increased amount of progesterone during the secretory phase of menstrual cycle is ---- ---- . ( a)Maturation of secondary follicle, b)Increased secretion of FSH, c)Regression of corpus luteum, d)Formation of corpus luteum from Graafian follicle )

Description : 8.The reason for increased amount of progesterone during the secretory phase of menstrual cycle is ---- ---- . ( a)Maturation of secondary follicle, b)Increased secretion of FSH, c)Regression of corpus luteum, d)Formation of corpus luteum from Graafian follicle )

Last Answer : d)Formation of corpus luteum from Graafian follicle

How are general growth and sexual v maturation different from each other? -Biology

Description : How are general growth and sexual v maturation different from each other? -Biology

Last Answer : General growth refers to different types of developmental process in the body like increase in height, weight gain, changes in shape and size of the body. During this phase, the reproductive ... slower rate. During sexual maturation, the changes that occur prepare the body for sexual reproduction.

What is dithecous anther? -Biology

Description : What is dithecous anther? -Biology

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What is the function of the anther? -Biology

Description : What is the function of the anther? -Biology

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Why is the anther important? -Biology

Description : Why is the anther important? -Biology

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Why is the anther elevated? -Biology

Description : Why is the anther elevated? -Biology

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What is the anther of a flower? -Biology

Description : What is the anther of a flower? -Biology

Last Answer : answer: