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Draw a vertical section of a maize grain and label (i) pericar
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Draw a vertical section of a maize grain and label
(i) pericarp,
(ii) scutellum,
(iii) coleoptile, and
(iv) radicle

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Views: 5,748 students

Book

Book:

Trueman's Biology for NEET (Truemans)

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Draw a vertical section of a maize grain and label
(i) pericarp,
(ii) scutellum,
(iii) coleoptile, and
(iv) radicle
12 mins ago
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Practice questions from Trueman's Biology for NEET (Truemans)

Question 1
Easy
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Views: 5,416

Topic

Topic:

Sexual Reproduction in Flowering Plants

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Book:

Trueman's Biology for NEET (Truemans)

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Question 2
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Topic

Topic:

Sexual Reproduction in Flowering Plants

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Book:

Trueman's Biology for NEET (Truemans)

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Question 3
Easy
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Topic

Topic:

Sexual Reproduction in Flowering Plants

Book

Book:

Trueman's Biology for NEET (Truemans)

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Question 4
Hard
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Views: 6,234

Give reasons why:
(i) Most zygotes in angiosperms divide only after certain amount of endosperm is formed.
(ii) Groundnut seeds are exalbuminous and castor seeds are albuminous.
(iii) Micropyle remains as a small pore in the seed coat of a seed.
(iv) Integuments of an ovule harden and the water content is highly reduced, as the seed matures.
(v) Apple and cashew are not called true fruits.
Topic

Topic:

Sexual Reproduction in Flowering Plants

Book

Book:

Trueman's Biology for NEET (Truemans)

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Practice more questions from Sexual Reproduction in Flowering Plants

Question 1
Easy
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Views: 5,567

In Angiosperm, if haploid number of chromosome is 12 then what will be the no. of chromosomes in integuments and synergids :-
  1. 12, 12
  2. 24, 12
  3. 24, 24
  4. 12, 24
Topic

Topic:

Sexual Reproduction in Flowering Plants

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Question 2
Easy
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Which of the following statements about sporopollenin are true? I. Exine is made up of sporopollenin. II. Sporopollenin is one of the most. resistant organic materials. III. Sporopollenin can withstand high temperatures and strong acids. IV. So far no enzyme is known to degrade sporopollenin. Codes
  1. I and II
  2. III and IV
  3. | and III
  4. All of these
Topic

Topic:

Sexual Reproduction in Flowering Plants

Book

Book:

CBSE New Pattern Biology Class 12 for 2021-22 Exam MCQs based book for Term 1

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Question 3
Easy
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Views: 6,143

Identify and in the diagram given below
  1. A-Antipodal, B-2 Polar nuclei, C-Center cell, D-Egg, E-Synergids
  2. A- Antipodal, B-Central cell, C-2 Polar nuclei, D-Egg, E-Synergids
  3. A-2 Polar nuclei, B-Central cell, C-Antipodal cell, D-Egg, E-Synergids
  4. A-Synergids, B-Egg, C-Central cell, D-2 Polar nuclei, E- Antipodal cell
Topic

Topic:

Sexual Reproduction in Flowering Plants

View 3 solutions

Question 4
Easy
Views

Views: 5,768

Tapetum is found in :
  1. Anther
  2. Microspore
  3. Male gametophyte
  4. Female gametophyte
Topic

Topic:

Sexual Reproduction in Flowering Plants

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The type of the cells which does not attack target cells directly are: (a) Macrophages (b) Cytotoxic T cells (c) Helper T cells (d) Natural killer cells
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Biology

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A cross between two tall pea plants is represented below. Study the flow chart and answer any four questions from to given below: (i) It is a
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  3. back cross
  4. dihybrid cross
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Genetics and Evolution

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Question 3
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Q.1. Describe the nervous system in Hydra. Sketch and label the nerve net in Hydra. [3 Marks] Ans:
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  2. Nervous system of Hydra consists of the sensory cells and the nerve cells (neurons) along with their fibres.
  3. The nerve cells are distributed throughout the body and interconnected to each other by synapses between their fibres to form the nerve net.
  4. There are two nerve nets in the mesoglea of Hydra, one connected towards the epidermis and the other towards the gastro-dermis.
  5. Hydra lacks specialized sense organs however, it has sensory cells scattered in the body wall and tentacles.
  6. The nerve cells have fibres but there are no sensory and motor nerves.
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Question 4
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It is the interaction of pollen grains with sporophytic tissue (stigma). It begins with pollination and ends with fertilization. All the events from the deposition of pollen grain on stigma to the entry of pollen tube in the ovule (synergid) are referred as pollen - pistil interaction. Pollination does not guarantee the transfer of right type of pollen, often wrong type also land on stigma. The pistil has the ability to recognise and accept the right or compatible pollen of the same species. Thus wrong type of pollen is discarded by pistil. Compatibility incompatibility of the pollen-pistil is. determined by special proteins. This process involves pollen recognition followed by promotion or inhibition of pollen. -pollination and the The stigmatic surface of flower refuse Primula (Primrose, s/ types of flowers mers are placed at and heteroanthy). From reaching the In heteromorphic uced from anther t the same level. other wrong type or incompatible pollen grains. A physiologial mechanism operates to ensure that only intraspecific pollen germinate successfully. The compatible pollen absorbs water and nutrients from the surface of stigma, germinates and produces pollen tube. Its growth through the style is determined by specific chemicals. The stigmatic surface provides the essential prerequisites for a successful germination, which are absent in the pollen. The pollen tube is finally pushed through the ovule and reaches the embryo sac. The tip of the pollen tube enters in one of the synergids and then ruptures to release the contents. Due to pollen pistil interaction, intense competition develops even in the compatible pollen grains (gametes). It also plays important role in sexual reproduction and seed formation. Pollen grain can also be induced to germinate in a synthetic. medium. Sucrose induces pollen germination and tube growth in vitro. Addition of boric acid. facilitates and accelarates pollen germination. be monoccious, e.g. Mulberry, Papaya. s and stigmas mature isexual flower so as n. It can be further =type, androccium e gynoecium c.g. in ower. gynoecium matures ium) e.g. Gloriosa. flowers germinate in the pollen grains Apple. mite ce to prevent self lower. In plants, present between Contact of pollen e.g. Calotropis- oned above the ility) sm due to which gma of the same Co Thea ames, the plants ross pollination . wheat, rice. Sta Artificial hybridization : It is one of the major approaches used in the crop improvement. Only the desired
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Genetics and Evolution

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Question Text
Draw a vertical section of a maize grain and label
(i) pericarp,
(ii) scutellum,
(iii) coleoptile, and
(iv) radicle
TopicSexual Reproduction in Flowering Plants
SubjectBiology
ClassClass 12
Answer TypeText solution:1
Upvotes109