PART - 2 - Unit V : CH - 18 Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Which of the following pairs are correctly matched?

S.no.	Animals		Morphological features
(i)	Crocodile	-	4-chambered heart
(ii)	Sea urchin	-	Parapodia
(iii)	Obelia	-	Metagenesis
(iv)	Lemur	-	Thecodont

1. (i), (iii) and (iv).
2. (ii), (iii) and (iv).
3. Only (i) and (iv).
4. Only (i) and (ii).

How are the hypothalamic hormones transported to target organs?

Which type of circulation is used by mammals?

1. Open type.
2. Closed type.
3. Double circulation.
4. Single circulation.

How are sclereids different from sclerenchyma fibres?

Distinguish between afferent neurons and efferent neurons.

What are the stages of growth?

How are chloroplasts different from chromoplasts?

Explain, how is it possible that a short-day plant and a long-day plant growing in the same location could flower on the same day of the year.

Anurag and Amit (students of class XIth) were best friends, one day during the lunch time Anurag gave naashpati (Pyrus) to Amit (as he was fond of that). Amit refused to eat it because he did not like them due to their hardness as compared to apples. Anurag reached home and told her mother (a botanist) that he will also not eat naashpati's. His mother corrected him and told him that he should eat it, as it contains the calcium for the growth of the body.

1. What is the reason for the difference in the softness in apple and naashpati fruits?
2. What are sclereids?
3. What values are inferred from mother's of Anurag's character?

What is Osteoporosis?