The organelle involved in tissue respiration is the

A. endoplasmic reticulum

B. ribosome

C. golgi body

D. mitochondrion

A tissue can best be defined as

A. an aggregate of similar cells

B. an aggregate of cells performing a similar function

C. an aggregate of similar cells performing the same function

D. a mixture of different cells types performing the same function

Which of the following correctly summarizes the life cycle of fern plant?

A. Spore → prothallus → thallus → sporangium

B. Male and female gamentangia → zygospores → sporangium → spores

C. Spore → thallus → spermatozoa + ovum → sporangium

D. Prothallus → spermatozoid → +egg cell → leafy plant → sporangium → spore

A major difference between platyhelminthees and coelenterates is that platyhelminthes

A. are multicellular

B. have developed a mesoderm

C. reproduce sexually

D. reproduce asexually

The essential structural difference between hydra and tapeworm is that while Hydra

A. has tentacles, tapeworm is parasitic

B. is diploblastic, tapeworm is triplobastic

C. has a mouth, tapeworm feeds by suckers

D. has mesoderm, tapeworm has mesogloea

The flowering period of plants in a habitat is determined by the

A. duration of sunlight

B. intensity and duration of rainfall

C. relative humidity of the atmosphere

D. temperature of the habitat

The structure labelled X is used by the organism in the same way as man uses his

A. oesophagus

B. trachea

C. stomach

D. intestine

The structure labelled Y is the

A. food vacuole

B. nucleolous

C. macronucleus

D. contractile vacuole

Which of the following insects undergoes incomplete metamorphosis?

A. Mosquito

B. Termite

C. Housefly

D. Moth

An onion is a bulb because it

A. has a tuberous stem

B. has a reduced stem and thick fleshy leaves

C. has adventitous roots

D. bears many buds at the nodes