| Direct development | Direct development |
| 1. It is a type of development in which an embryo develops into a mature individual without involving a larval stage. |
1. It is a type of development that involves a sexually immature larval stage, having different food requirements than adults. |
| 2. Metamorphosis is absent. | 2. Metamorphosis involving the development of larva to a sexually mature adult is present. |
| 3. It occurs in fishes, reptiles, birds, and mammals. | 3. It occurs in most invertebrates and amphibians. |
Answered by Pragya Singh | 1 year ago
Prepare a list of some animals that are found parasitic on human beings.
Match the following:
| Column I | Column II |
| (a) Operculum | (i) Ctenophora |
| (b) Parapodia | (ii) Mollusca |
| (c) Scales | (iii) Porifera |
| (d) Comb plates | (iv) Reptilia |
| (e) Radula | (v) Annelida |
| (f) Hairs | (vi) Cyclostomata and Chondrichthyes |
| (g) Choanocytes | (vii) Mammalia |
| (h) Gill slits | (viii) Osteichthyes |
Segmentation in the body is first observed in which of the following:
(a) Platyhelminthes
(b) Aschelminthes
(c) Annelida
(d) Arthropoda
Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
What are the modifications that are observed in birds that help them fly?