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Sexual Reproduction in Flowering Plants

The Carpel (Megasporophyll) and the Ovule (Megasporangium)

In typical embryo sac, the nuclei are arranged as -

Question

Easy

Solving time: 1 mins

In typical embryo sac, the nuclei are arranged as -

3 + 2+ 3

3 + 3 + 2

2 + 3 + 3

2 + 4 + 2

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Book:

Dr. Ali Objective Biology

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In typical embryo sac, the nuclei are arranged as -

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A normal dicot embryo sac is 7 celled but 8 nucleate structure. The arrangement of nuclei in a normal dicot embryo sac is 3+2+3 which represents a three celled egg apparatus consisting of an egg cell and two synergids at the micropylar end. Then after two nuclei in the centre of the embryo sac. And The last three nuclei represent the antipodal cells present at the chalazal end.

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Practice questions from Dr. Ali Objective Biology

Question 1

Easy

Which of the following is crucial for storage of seeds to be used as food throughout the year and to raise crops in the next season?

Abundant water in seeds
Dehydration and dormancy of matured seeds
Least amount of food in seeds
Presence of endospermous food in all seeds

Topic:

Sexual Reproduction in Flowering Plants

Book:

Dr. Ali Objective Biology

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Question 2

Easy

The diagram above shows megasporogenesis and development of typical female gametophyte in angiosperms.In which of the following options all divisions (

D_{1}

D_{5}

) and structure (S) are correctly identified?

D1- Meiosis I D2- Meiosis II D3- Mitosis D4- Mitosis D5- Mitosis S- Microgametophyte
D1- Meiosis I D2- Meiosis II D3- Mitosis D4- Mitosis D5- Mitosis S- Embryo
D1- Meiosis I D2c-Meiosis II D3- Mitosis D4- Mitosis D5- Mitosis S- Embryo sac
D1- Mitosis D2- Meiosis D3- Mitosis D4- Mitosis D5- Mitosis S- Embryo sac

Topic:

Sexual Reproduction in Flowering Plants

Book:

Dr. Ali Objective Biology

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Question 3

Easy

Even in absence of pollinating agents seed setting is assured in

$C o mm e ll ina$
$Z os t er a$
$S a l v ia$
Fig

Topic:

Sexual Reproduction in Flowering Plants

Book:

Dr. Ali Objective Biology

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Question 4

Easy

Pollen grain ………………… has prominent apertures called ……………… where sporopollenin is …….

intine, germpore, absent
exine, germpore, absent
exine, germpore, present
exine, foramen ovale, absent

Topic:

Sexual Reproduction in Flowering Plants

Book:

Dr. Ali Objective Biology

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Practice more questions from Sexual Reproduction in Flowering Plants

Question 1

Easy

Trace the development of megaspore mother cell up to the formation of a mature embryo-sac in a flowering plant.

Topic:

Sexual Reproduction in Flowering Plants

Book:

Trueman's Biology for NEET (Truemans)

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Question 2

Easy

How is it possible in Oxalis and Viola to produce assured seed-sets even in the absence of its pollinators ?

Topic:

Sexual Reproduction in Flowering Plants

Book:

Oswaal CBSE Question Bank Class 12 Biology Chapterwise and Topicwise (Oswaal)

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Question 3

Easy

Microsporogenesis is the

development of megaspore
development of pollen grain
development of male gametophyte
development of female gametophyte

Topic:

Sexual Reproduction in Flowering Plants

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Question 4

Medium

Assertion (A): Cleistogamous flowers can produce seeds without pollination.
Reason (R) : Cleistogamous flowers have no chance of cross pollination and they are invariably autogamous.
(A) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(B) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(C) Assertion (A) is true but reason (R) is false.
(D) Assertion (A) is false but reason (R) is true.

Topic:

Sexual Reproduction in Flowering Plants

Book:

Oswaal CBSE MCQs Chapterwise For Term I II, Class 12, Biology (Oswaal)

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Practice questions on similar concepts asked by Filo students

Question 1

The double helical structure of DNA (B-DNA) was given by Watson and Crick, the helical organisation indicates

Quaternary structure
Primary structure
Secondary structure
Tertiary structure

Topic:

Structural Organisation in Plants and Animals

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Question 2

However, this region plays a significant role in the maintenance of ifigh osmolarity of medullary interstitial fluid, The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes. hilis concentrates the filtrate as it moves down. The ascending impermeable to water but allows transport of electrolytes actively or passively. Therefore, as the concentrated filtrate pass upward, it gets diluted due to the passage of electrolytes to the medullary fluid. Distal Convoluted Tubule (DCT): Conditional reabsorption of Nat and water takes place in this segment. DCT is also capable of reabsorption of

HCO_{3}^{-}

and selective secretion of hydrogen and potassium ions and

NH_{3}

to maintain the

pH

and sodium-potassium balance in blood.

Topic:

Human Physiology

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Question 3

Compound epithelium is made of more than one layer (multi-layered) of cells and thus has a limited roie in secretion and absurption (Figure 7.3). Their main function is to provide protection against chemicai and mechanical stresses. They cover the dry suriace of the skin, the moisi suface of buccal cavity, pharynx, inner lining of ducts of salivary glands and of pancreatic ducts.

Topic:

Structural Organisation in Plants and Animals

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Question 4

glands secrete an alkaline, viscous, mucous like fluid which acts as a lubricant during copulation. 1. 2. 3. A pair of ovaries A pair of oviducts Uterus om help in drawing testes close or away on the body. This helps in maintaining the pture of the testis 2-3°C lower than the smal body temperature, necessary for 4 Vagina 5. External genitalia (vulva) A pair of vestibular glands A pair of mammary glands Semen: It is the viscous, alkaline and milky fluid (pH 7.2 to 7.7) ejaculated by the male 6. reproductive system. Normally 2.5 to 4.0 ml of semen is given out during a single ejaculation and it contains about 400 million sperms. It contains secretion of the epididymis and the accessory glands for nourishing (fructose). neutralizing acidity (Ca, bicarbonates). activation for movement (prostaglandins). Can you recall? Give labels to given female reproductive system: d. External genitalia: It includes the penis and the scrotum. The penis is the male copulatory organ. It is cylindrical and muscular with three bundles of erectile tissue a pair of postero-lateral tissue called corpora cavernosa and a median corpus spongiousm. The swollen tip of the penis is called glans penis. It is covered by a loose fold of skin called foreskin or prepuce. Scrotum: It is a loose pouch of pigmented skin lying behind the penis and is divided into a right and left scrotal sac by a septum of tunica dartos made of smooth muscle fibres. The foetal testes are guided into and retained in the scrotum by a short fibro muscular band called gabernaculum. The testes remain suspended in scrotum by a spermatic chord. Failure of testis to descend into scrotum is called cryptorchidism. The failure also results in the stility The cremaster and dartos muscles of the uterus to the dorsal body wall. The ove 1. Ovary : It is the primary female sex og Its main function is production of egg or eve and the female reproductive hormones. I solid, oval or almond shaped organ. It is cm in length, 1.5 cm in breadth and 1.0 thick. It is located in the upper lateral part the pelvis near the kidneys. Each ovary is h in position by ligaments by attaching it to uterus and the abdominal wall. The larges these is the broad ligament formed by a of peritoneum. It holds the ovary, ovidact ligament attaches ovary to the uterus ovary produces five hormones viz, est progesteron, relaxin, activin and inhibin Structure and development of the over Each ovary is a compact str differentiated into a central part called m de Reproductive System: The female reproductive system consist of and the outer part called cortex. The is covered externally by a layer of ga

Topic:

Human Physiology

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Question Text	In typical embryo sac, the nuclei are arranged as -
Topic	Sexual Reproduction in Flowering Plants
Subject	Biology
Class	Class 12
Answer Type	Text solution:1
Upvotes	122

In typical embryo sac, the nuclei are arranged as -

Text solutionVerified

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