Question

1. During embryonic development and growth in vertebrates _____ cell division takes

place.

2. White hair of guineapig is expressed when the white genes is present in _____

condition.

3. In Dryopteris adult plant body represents ______ generation.

4 .Lung is provided with ______ in pigeon.

5._____ is a black coloured circular disc of the eye suspended in the aqueous humor from

the ciliary body

6.In ______ movement the pollen tube move towards the ovum.

Decide whether the following statements are true or false :-

7 In a dihybrid cross experiment, Mendel obtained 50% pure tall plant in first filial

generation.

8 Feedback control of TSH is initiated by low or high level of thyroxine.

9 Shimul flower is ornithophilous.

10 The role of microtubule in cell division is formation of spindle fibres.

.11 Multiple fission is common in Yeast during unfavourable condition.

12 Acetylcholine and adrenaline are neurotransmitters.

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Answer 1

Explanation:

Neurotransmitters are chemical messengers that transmit a message from a nerve cell across the synapse to a target cell. The target can be another nerve cell, or a muscle cell, or a gland cell. They are chemicals made by the nerve cell specifically to transmit the message.