CBSE Class 12 Biology HOTs Sexual Reproduction In Flowering Plants

CBSE Class XII HOTs Biology - Sexual Reproduction In Flowering Plants database with answers (Please refer to other links for answers to HOTs questions) for Class 12 of CBSE exams for CBSE Students. Based on CBSE and NCERT guidelines. The students should practice these Question Papers to gain perfection which will help him to get more marks in CBSE examination. Please refer to more CBSE Class 12 question papers in other links. 

SEXUAL REPRODUCTION IN FLOWERING PLANTS.

1mark

1) Do pollen grains survive in adverse conditions? 1

2) Non- albuminons seeds do not have endosperm, then from where do they take the food during germination? 1

3) T.S. of anther shows four layers in the wall-epidermis, endothelium, tapetum and middle layer, Arrange them from outermost to innermost. 1

4) Identify the figure given below and label the parts indicated in the figure. 1

class_12_Biology__Hots_1

5) Complete the flow chart. 1

class_12_Biology__Hots_2

6) If the number of chromosomes in the leaf cell of a flowering plant is 28, What number would you expect in the embryo and endosperm? 12 marks

7) (a) "The microspore is haploid while that of microspore mother cell is diploid" comment. 2

(b) How many male gametes and female gamets are produced by?

(i) Five microspore mother cell (ii) Five megaspore mother cell


8) (a) what is the process shown in the diagram given below?
 
(b)Name the structure at (a) of the figure given below 2
CBSE_Class_12_Biology_Reproduction_1
9) Why do you think that the zygote is dormant for some time in a fertilized ovule? 2
 
10) What will be the fate of ovule if the synergids are absent in the embryo sac? 2
 
11) Your friend would like to cross-pollinate the bisexual flower. How can you guide him to be successful in his experiment?
 
12) How does the flower of maize and cannabis are pollinated? What are the features found in these flowers for such type of pollination? 2
 
3 marks
13) Generally nucellus does not persist in mature seeds. Cite two examples which show persistence of nucellus in the seed and what name is given to the persistent nucellulus?3
 
14) If one can induce parthenocarpy through the application of phytohormones, which fruit would you select to induce parthenocarpy and why? 3
 
5 marks
15) A student wants to know the ploidy of coconut. After studying its different parts he inferred the ploidy of the following parts. Check whether the student is correct. 5
(a) Water inside the fruit-n
(b) White Kernal-2n
(c) Seed coat-n
(d) Embryo-3n
(e) Tepal-2n
 
ANSWER2: SEXUAL REPRODUCTION IN PLANTS
Ans 1) Yes, sporopollenin is present in exine which is not digested by enzymes.
 
Ans 2) They take food from cotyledons
 
Ans 3) outer most- Epidermis
           Endothecium
          Middle layer
Inner most. Tapetum
 
Ans 4) A. vacuoles
    B. Nucleus
Development of pollen grain
 
Ans 5) (i) Pollination
(ii) Geitonogamy
 
Ans 6) Embryo - 28
Endosperm - 42
 
Ans 7) (a) MMC under goes meiotic division to form microspores.
     (b) (i) Male gametes-20
          (ii) Female gamets-5
 
Ans 8) (a) Microsporogenesis
    (b) Pollen grain tetrad.
 
Ans 9) Zygote divides only after the formation of endosperm because endosperm nourishes the developing embryo.
 
Ans 10) Synergids have filiform apparatus at the micropylar end which guides pollen tube into the egg apparatus, otherwise pollen tube may not enter to embryo sac, no fertilization.
 
Ans 11) Emasculation followed by artificial pollination, i.e. Pollens of selected plants have to be dusted on the stigma before bagging the flower.
 
Ans 12) By Wind
(i) Pollen grains are dry, light, produced in large quantity
(ii) stigma is hairy and feathery
 
Ans 13) (a) Black pepper and beet
      (b) Perisperm
 
Ans 14) Orange, lemon, watermelon, Guava etc.
These seedless fruits are economically important Commercially viable for horticulturists.
15)
(a) 34
(b) 34
(c) 24
(d) 24
(e) 24

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