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SAI International School
Subject- Biology, Class X
Chapter- How do Organisms Reproduce?
Subtopic- Sexual reproduction in Flowering Plants.
Module-20
Home Assignment- III

Worksheet 1

Q1. Binary fission begins in amoeba with
(a) Constriction of the body
(b) Elongation of the body
(c) Constriction of the Nucleus
(d) Elongation of the Nucleus

Q2. Propagation of plants by culturing the cells, tissues and organs is termed as
(a) Tissue culture
(b) Layering
(c) Grafting
(d) Budding

Q3. Triple fusion involves
(a) Fusion of two gametes and the egg
(b) One gamete, one egg and one polar nuclei
(c) One gamete and two polar nuclei
(d) Diploid zygote and one polar nuclei

DIRECTION : Question nos. 4 and 5 below consist of two statements -
Assertion (A) and Reason (R). Answer these questions selecting the
appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both Assertion and Reason are false.

Q4. Assertion : Some fruits are seedless or contain empty or non-viable seeds.
Reason: They are produced without fertilization.

Q5. Assertion : Characteristics of parental plants can be preserved through
asexual reproduction.
Reason : Vegetative reproduction involves only mitosis.

Q6. (a) “Cell division is a type of reproduction in unicellular organisms”. Justify.
(b) Malarial parasite divides into many daughter individuals simultaneously
through multiple fission. State an advantage the parasite gets because of
this type of reproduction.
(c) Name two simple organisms having the ability of regeneration.

Q7. (a) Name the information source of making proteins in the cell.
(b) State two basic events in reproduction.
(c) Newly formed DNA copies may not be identical at times. Give one
reason.