Give reasons as to why cell division cannot be a type of reproduction in multicellular organisms.

2

(a)

In haploid organism that undergo sexual reproduction, name the stage in the life cycle when meiosis occurs.  Give reasons for your answer.

2

(a)

Given below are events that are observed in an artificial hybridisation programme. Arrange them in correct sequential order in which they are followed in hybridization programme.
(a)Re-bagging (b)Selection of parents
(c)Bagging (d) Dusting of pollen on stigma
(e) Emasculation
(f) Collection of pollen from male parent.

2

(a)

Does self-incompatibility impose any restricions on autogamy ? Give reasons and suggest the method of pollination in such plants?

2

(a)

Is it possible to consider vegetative propagation observed in certain plants like bryophyllum, water hyacinth, Ginger, etc. as a type of asexual reproduction? Give two/three reasons.

2

(a)

In a developing embryo, analyse the consequences if cell divisions are not followed by cell differentiation 

2

(a)

List the changes observed in an angiosperm flower subsequent to pollination and fertilization.

2

(a)

Why is it that there is no natural death in single-celled organisms like Amoeba and bacteria?

2

(a)

Is there a relationship between the size of anorganism and its lifespan? Give two examples in support of your answer.

2

(a)

Give reason for the following
(i) The animals exhibiting external fertilisation discharge large number of gametes.
(ii) Marchantia is a dioecious plant.

2

(a)